iOS 知识-常用小技巧大杂烩

1. 打印View所有子视图

po [[self view]recursiveDescription]

2. layoutSubviews调用的调用时机

* 当视图第一次显示的时候会被调用
* 当这个视图显示到屏幕上了,点击按钮
* 添加子视图也会调用这个方法
* 当本视图的大小发生改变的时候是会调用的
* 当子视图的frame发生改变的时候是会调用的
* 当删除子视图的时候是会调用的

3. NSString过滤特殊字符

// 定义一个特殊字符的集合
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:
@"@／：；（）¥「」＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\""];
// 过滤字符串的特殊字符
NSString *newString = [trimString stringByTrimmingCharactersInSet:set];

4. TransForm属性

//平移按钮
CGAffineTransform transForm = self.buttonView.transform;
self.buttonView.transform = CGAffineTransformTranslate(transForm, 10, 0);

//旋转按钮
CGAffineTransform transForm = self.buttonView.transform;
self.buttonView.transform = CGAffineTransformRotate(transForm, M_PI_4);

//缩放按钮
self.buttonView.transform = CGAffineTransformScale(transForm, 1.2, 1.2);

//初始化复位
self.buttonView.transform = CGAffineTransformIdentity;

5. 去掉分割线多余15像素

首先在viewDidLoad方法加入以下代码：
 if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
        [self.tableView setSeparatorInset:UIEdgeInsetsZero];    
}   
 if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {        
        [self.tableView setLayoutMargins:UIEdgeInsetsZero];
}
然后在重写willDisplayCell方法
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell 
forRowAtIndexPath:(NSIndexPath *)indexPath{   
    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {       
             [cell setSeparatorInset:UIEdgeInsetsZero];    
    }    
    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {        
             [cell setLayoutMargins:UIEdgeInsetsZero];    
    }
}

6. 计算方法耗时时间间隔

// 获取时间间隔
#define TICK   CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();
#define TOCK   NSLog(@"Time: %f", CFAbsoluteTimeGetCurrent() - start)

7. Color颜色宏定义

// 随机颜色
#define RANDOM_COLOR [UIColor colorWithRed:arc4random_uniform(256) / 255.0 green:arc4random_uniform(256) / 255.0 blue:arc4random_uniform(256) / 255.0 alpha:1]
// 颜色(RGB)
#define RGBCOLOR(r, g, b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]
// 利用这种方法设置颜色和透明值，可不影响子视图背景色
#define RGBACOLOR(r, g, b, a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]

8. Alert提示宏定义

#define Alert&#40;_S_, ...&#41; [[[UIAlertView alloc] initWithTitle:@"提示" message:[NSString stringWithFormat:(_S_), ##__VA_ARGS__] delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil] show]

9. 让iOS应用直接退出

- (void)exitApplication {
    AppDelegate *app = [UIApplication sharedApplication].delegate;
    UIWindow *window = app.window;

    [UIView animateWithDuration:1.0f animations:^{
        window.alpha = 0;
    } completion:^(BOOL finished) {
        exit(0);
    }];
}

10. NSArray 快速求总和最大值最小值和平均值

NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil];
CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue];
NSLog(@"%f\n%f\n%f\n%f",sum,avg,max,min);

10. 修改Label中不同文字颜色

- (void)touchesEnded:(NSSet<UITouch> *)touches withEvent:(UIEvent *)event
{
    [self editStringColor:self.label.text editStr:@"好" color:[UIColor blueColor]];
}

- (void)editStringColor:(NSString *)string editStr:(NSString *)editStr color:(UIColor *)color {
    // string为整体字符串, editStr为需要修改的字符串
    NSRange range = [string rangeOfString:editStr];

    NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:string];

    // 设置属性修改字体颜色UIColor与大小UIFont
    [attribute addAttributes:@{NSForegroundColorAttributeName:color} range:range];

    self.label.attributedText = attribute;
}

11. 播放声音

  #import<AVFoundation>
   //  1.获取音效资源的路径
   NSString *path = [[NSBundle mainBundle]pathForResource:@"pour_milk" ofType:@"wav"];
   //  2.将路劲转化为url
   NSURL *tempUrl = [NSURL fileURLWithPath:path];
   //  3.用转化成的url创建一个播放器
   NSError *error = nil;
   AVAudioPlayer *play = [[AVAudioPlayer alloc]initWithContentsOfURL:tempUrl error:&error];
   self.player = play;
   //  4.播放
   [play play];

12. 检测是否IPad Pro

- (BOOL)isIpadPro
{   
  UIScreen *Screen = [UIScreen mainScreen];   
  CGFloat width = Screen.nativeBounds.size.width/Screen.nativeScale;  
  CGFloat height = Screen.nativeBounds.size.height/Screen.nativeScale;         
  BOOL isIpad =[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad;   
  BOOL hasIPadProWidth = fabs(width - 1024.f) < DBL xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed xss=removed>> ~/.lldbinit
    echo target stop-hook add -o \"target stop-hook disable\" >> ~/.lldbinit
下次重新运行项目，然后就不报错了。

25. Label行间距

-（void）test{
    NSMutableAttributedString *attributedString =    
   [[NSMutableAttributedString alloc] initWithString:self.contentLabel.text];
    NSMutableParagraphStyle *paragraphStyle =  [[NSMutableParagraphStyle alloc] init];  
   [paragraphStyle setLineSpacing:3];

    //调整行间距       
   [attributedString addAttribute:NSParagraphStyleAttributeName 
                         value:paragraphStyle 
                         range:NSMakeRange(0, [self.contentLabel.text length])];
     self.contentLabel.attributedText = attributedString;
}

26. UIImageView填充模式

@"UIViewContentModeScaleToFill",      // 拉伸自适应填满整个视图  
@"UIViewContentModeScaleAspectFit",   // 自适应比例大小显示  
@"UIViewContentModeScaleAspectFill",  // 原始大小显示  
@"UIViewContentModeRedraw",           // 尺寸改变时重绘  
@"UIViewContentModeCenter",           // 中间  
@"UIViewContentModeTop",              // 顶部  
@"UIViewContentModeBottom",           // 底部  
@"UIViewContentModeLeft",             // 中间贴左  
@"UIViewContentModeRight",            // 中间贴右  
@"UIViewContentModeTopLeft",          // 贴左上  
@"UIViewContentModeTopRight",         // 贴右上  
@"UIViewContentModeBottomLeft",       // 贴左下  
@"UIViewContentModeBottomRight",      // 贴右下

27. 宏定义检测block是否可用

#define BLOCK_EXEC(block, ...) if (block) { block(__VA_ARGS__); };   
// 宏定义之前的用法
 if (completionBlock)   {   
    completionBlock(arg1, arg2); 
  }    
// 宏定义之后的用法
 BLOCK_EXEC(completionBlock, arg1, arg2);

28. Debug栏打印时自动把Unicode编码转化成汉字

// 有时候我们在xcode中打印中文,会打印出Unicode编码,还需要自己去一些在线网站转换,有了插件就方便多了。
 DXXcodeConsoleUnicodePlugin 插件

29. 设置状态栏文字样式颜色

[[UIApplication sharedApplication] setStatusBarHidden:NO];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

30. 自动生成模型代码的插件

// 可自动生成模型的代码，省去写模型代码的时间
ESJsonFormat-for-Xcode

31. iOS中的一些手势

轻击手势（TapGestureRecognizer）
轻扫手势（SwipeGestureRecognizer）
长按手势（LongPressGestureRecognizer）
拖动手势（PanGestureRecognizer）
捏合手势（PinchGestureRecognizer）
旋转手势（RotationGestureRecognizer）

32. iOS 开发中一些相关的路径

模拟器的位置:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs 

文档安装位置:
/Applications/Xcode.app/Contents/Developer/Documentation/DocSets

插件保存路径:
~/Library/ApplicationSupport/Developer/Shared/Xcode/Plug-ins

自定义代码段的保存路径:
~/Library/Developer/Xcode/UserData/CodeSnippets/ 
如果找不到CodeSnippets文件夹，可以自己新建一个CodeSnippets文件夹。

证书路径
~/Library/MobileDevice/Provisioning Profiles

33. 获取 iOS 路径的方法

获取家目录路径的函数
NSString *homeDir = NSHomeDirectory();

获取Documents目录路径的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex:0];

获取Documents目录路径的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDir = [paths objectAtIndex:0];

获取tmp目录路径的方法：
NSString *tmpDir = NSTemporaryDirectory();

34. 字符串相关操作

去除所有的空格
[str stringByReplacingOccurrencesOfString:@" " withString:@""]

去除首尾的空格
[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

- (NSString *)uppercaseString; 全部字符转为大写字母
- (NSString *)lowercaseString 全部字符转为小写字母

35. CocoaPods pod install/pod update更新慢的问题

pod install --verbose --no-repo-update 
pod update --verbose --no-repo-update
如果不加后面的参数，默认会升级CocoaPods的spec仓库，加一个参数可以省略这一步，然后速度就会提升不少。

36. MRC和ARC混编设置方式

在XCode中targets的build phases选项下Compile Sources下选择 不需要arc编译的文件
双击输入 -fno-objc-arc 即可

MRC工程中也可以使用ARC的类，方法如下：
在XCode中targets的build phases选项下Compile Sources下选择要使用arc编译的文件
双击输入 -fobjc-arc 即可

37. 把tableview里cell的小对勾的颜色改成别的颜色

_mTableView.tintColor = [UIColor redColor];

38. 调整tableview的separaLine线的位置

tableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);

39. 设置滑动的时候隐藏navigationbar

navigationController.hidesBarsOnSwipe = Yes

40. 自动处理键盘事件，实现输入框防遮挡的插件

IQKeyboardManager
https://github.com/hackiftekhar/IQKeyboardManager

41. Quartz2D相关

图形上下是一个CGContextRef类型的数据。
图形上下文包含：
1，绘图路径（各种各样图形）
2，绘图状态（颜色，线宽，样式，旋转，缩放，平移）
3，输出目标（绘制到什么地方去？UIView、图片）

1，获取当前图形上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
2，添加线条
CGContextMoveToPoint(ctx, 20, 20);
3，渲染
CGContextStrokePath(ctx);
CGContextFillPath(ctx);
4，关闭路径
CGContextClosePath(ctx);
5，画矩形
CGContextAddRect(ctx, CGRectMake(20, 20, 100, 120));
6，设置线条颜色
[[UIColor redColor] setStroke];
7， 设置线条宽度
CGContextSetLineWidth(ctx, 20);
8，设置头尾样式
CGContextSetLineCap(ctx, kCGLineCapSquare);
9，设置转折点样式
CGContextSetLineJoin(ctx, kCGLineJoinBevel);
10，画圆
CGContextAddEllipseInRect(ctx, CGRectMake(30, 50, 100, 100));
11，指定圆心
CGContextAddArc(ctx, 100, 100, 50, 0, M_PI * 2, 1);
12，获取图片上下文
UIGraphicsGetImageFromCurrentImageContext();
13，保存图形上下文
CGContextSaveGState(ctx)
14，恢复图形上下文
CGContextRestoreGState(ctx)

42. 屏幕截图

    // 1. 开启一个与图片相关的图形上下文
    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,NO,0.0);

    // 2. 获取当前图形上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();

    // 3. 获取需要截取的view的layer
    [self.view.layer renderInContext:ctx];

    // 4. 从当前上下文中获取图片
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    // 5. 关闭图形上下文
    UIGraphicsEndImageContext();

    // 6. 把图片保存到相册
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

第二种写法

  /**
     *截图功能
     */
     -(void)screenShot{
         
         
         CGRect rect = self.view.frame;
         UIGraphicsBeginImageContext(rect.size);
         CGContextRef context = UIGraphicsGetCurrentContext();
         [self.view.layer renderInContext:context];
         UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
         UIGraphicsEndImageContext();
         
         i = [[UIImageView alloc]initWithFrame:CGRectMake(20, 70, 300, 500)];
         i.layer.borderColor = [UIColor redColor].CGColor;
         i.layer.borderWidth = 2;
         i.image = img;
         
         [self.view addSubview:i];
         i.userInteractionEnabled = YES;
         //tap手势
         UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(event:)];
         [i addGestureRecognizer:tapGesture];
         [tapGesture setNumberOfTapsRequired:1];
         
     }

43. 隐藏导航栏上的返回字体

//Swift
UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), forBarMetrics: .Default)
//OC
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];

44. 解决tableview的分割线短一截

-(void)viewDidLayoutSubviews{
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)])
{ 
[self.tableView setSeparatorInset:UIEdgeInsetsMake(0,0,0,0)];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) 
{
[self.tableView setLayoutMargins:UIEdgeInsetsMake(0,0,0,0)]; 
}
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) 
{
[cell setSeparatorInset:UIEdgeInsetsZero]; 
} 
if ([cell respondsToSelector:@selector(setLayoutMargins:)]) 
{
[cell setLayoutMargins:UIEdgeInsetsZero]; 
}
}

45. 动态隐藏NavigationBar

//1.当我们的手离开屏幕时候隐藏
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{ 
if(velocity.y > 0) 
{
[self.navigationController setNavigationBarHidden:YES animated:YES];
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES]; 
}
}
velocity.y这个量，在上滑和下滑时，变化极小（小数），但是因为方向不同，有正负之分，这就很好处理了。

//2.在滑动过程中隐藏
//像safari
(1) 
self.navigationController.hidesBarsOnSwipe = YES;
(2)
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
 CGFloat offsetY = scrollView.contentOffset.y + __tableView.contentInset.top;
 CGFloat panTranslationY = [scrollView.panGestureRecognizer translationInView:self.tableView].y;
 if (offsetY > 64) {
 if (panTranslationY > 0) 
{ 
//下滑趋势，显示 
[self.navigationController setNavigationBarHidden:NO animated:YES];
} else { 
//上滑趋势，隐藏 
[self.navigationController setNavigationBarHidden:YES animated:YES]; 
}
} else {
[self.navigationController setNavigationBarHidden:NO animated:YES]; 
}
}
这里的offsetY > 64只是为了在视图滑过navigationBar的高度之后才开始处理，防止影响展示效果。panTranslationY是scrollView的pan手势的手指位置的y值，可能不是太好，因为panTranslationY这个值在较小幅度上下滑动时，可能都为正或都为负，这就使得这一方式不太灵敏.

效果图

46. 设置导航栏透明

1第一种方式

//方法一:设置透明度
[[[self.navigationController.navigationBar subviews]objectAtIndex:0] setAlpha:0.1];
//方法二:设置背景图片
/**
 * 设置导航栏,使其透明
 *
*/
- (void)setNavigationBarColor:(UIColor *)color targetController:(UIViewController *)targetViewController{
//导航条的颜色 以及隐藏导航条的颜色targetViewController.navigationController.navigationBar.shadowImage = [[UIImage alloc]init]; 
CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f); UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [color CGColor]); CGContextFillRect(context, rect); 
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [targetViewController.navigationController.navigationBar setBackgroundImage:theImage forBarMetrics:UIBarMetricsDefault];
}

2、设置透明导航栏

立即投资BG为默认的导航栏背景图片

透明navbarBG 是一张纯透明的png 图片

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self createNav];
  
}
- (void)createNav
{
    //替换导航栏透明
    UINavigationBar *navigationBar = self.navigationController.navigationBar;
    [navigationBar setTitleTextAttributes:@{
                                            NSForegroundColorAttributeName :[UIColor whiteColor]
                                            }];
    //navigationBar.alpha = 0;
    [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsDefault];
    [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsCompact];
    //去黑线
    [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
    [navigationBar setShadowImage:[UIImage new]];
}
//退出页面时候 恢复不透明
-(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsCompact];
   }
// 当滚动视图滚动到最顶端后，执行该方法 
//向上滚动时候不透明
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    
    
    // NSLog(@"scrollViewDidScroll");
    
    CGPoint point=scrollView.contentOffset;
    if(point.y>5){
        [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsDefault];
        [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"立即投资BG"] forBarMetrics:UIBarMetricsCompact];
        self.navigationController.navigationBar.barTintColor=[UIColor colorWithRed:243/255.0 green:90.0/255.0 blue:3.0/255.0 alpha:1.0];
    }else{
        UINavigationBar *navigationBar = self.navigationController.navigationBar;
        [navigationBar setTitleTextAttributes:@{
                                                NSForegroundColorAttributeName :[UIColor whiteColor]
                                                }];
        //navigationBar.alpha = 0;
        [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsDefault];
        [navigationBar setBackgroundImage:[UIImage imageNamed:@"透明navbarBG"] forBarMetrics:UIBarMetricsCompact];
    }
    // NSLog(@"%f,%f",point.x,point.y);
    // 从中可以读取contentOffset属性以确定其滚动到的位置。
    // 注意：当ContentSize属性小于Frame时，将不会出发滚动
}

47. 设置字体和行间距

//设置字体和行间距 
UILabel * lable = [[UILabel alloc]initWithFrame:CGRectMake(50, 100, 300, 200)]; 
lable.text = @"大家好,我是Frank_chun,在这里我们一起学习新的知识,总结我们遇到的那些坑,共同的学习,共同的进步,共同的努力,只为美好的明天!!!有问题一起相互的探讨--438637472!!!"; 
lable.numberOfLines = 0;
lable.font = [UIFont systemFontOfSize:12];
lable.backgroundColor = [UIColor grayColor]; 
[self.view addSubview:lable]; 
//设置每个字体之间的间距 
//NSKernAttributeName 这个对象所对应的值是一个NSNumber对象(包含小数),作用是修改默认字体之间的距离调整,值为0的话表示字距调整是禁用的; NSMutableAttributedString * str = [[NSMutableAttributedString alloc]initWithString:lable.text attributes:@{NSKernAttributeName:@(5.0)}];
//设置某写字体的颜色
//NSForegroundColorAttributeName 设置字体颜色
NSRange blueRange = NSMakeRange([[str string] rangeOfString:@"Frank_chun"].location, [[str string] rangeOfString:@"Frank_chun"].length); 
[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange]; 
NSRange blueRange1 = NSMakeRange([[str string] rangeOfString:@"438637472"].location, [[str string] rangeOfString:@"438637472"].length);
[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:blueRange1];
//设置每行之间的间距 
//NSParagraphStyleAttributeName 设置段落的样式
NSMutableParagraphStyle * par = [[NSMutableParagraphStyle alloc]init];
[par setLineSpacing:20];
//为某一范围内文字添加某个属性
//NSMakeRange表示所要的范围,从0到整个文本的长度
[str addAttribute:NSParagraphStyleAttributeName value:par range:NSMakeRange(0, lable.text.length)]; [lable setAttributedText:str];

效果图

48. 点击button倒计时

//第一种方法
//点击button倒计时
#import "ViewController.h"
@interface ViewController ()
@property (nonatomic, strong) UIButton * timeButton;
@property (nonatomic, strong) NSTimer * timer;
@property (nonatomic, strong)UIButton * btn;
@end@implementation ViewController
{ 
NSInteger _time;
}
- (void)viewDidLoad {
[super viewDidLoad]; 
_time = 5; 
self.btn = [UIButton buttonWithType:UIButtonTypeCustom]; _btn.backgroundColor = [UIColor orangeColor];
[_btn setTitle:@"获取验证码" forState:UIControlStateNormal]; _btn.titleLabel.font = [UIFont systemFontOfSize:15];
[_timeButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[_btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
[self refreshButtonWidth]; 
[self.view addSubview:self.btn];
}
- (void)refreshButtonWidth{ 
CGFloat width = 0; 
if (_btn.enabled){
 width = 100; 
} else { 
width = 200;
} 
_btn.center = CGPointMake(self.view.frame.size.width/2, 200);
_btn.bounds = CGRectMake(0, 0, width, 40); 
//每次刷新，保证区域正确
[_btn setBackgroundImage:[self imageWithColor:[UIColor orangeColor] andSize:_btn.frame.size] forState:UIControlStateNormal];
[_btn setBackgroundImage:[self imageWithColor:[UIColor lightGrayColor] andSize:_btn.frame.size] forState:UIControlStateDisabled];
}
- (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)aSize{
 CGRect rect = CGRectMake(0.0f, 0.0f, aSize.width, aSize.height); UIGraphicsBeginImageContext(rect.size);
 CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [color CGColor]); CGContextFillRect(context, rect);
 UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();
return image;
}
- (void)btnAction:(UIButton *)sender{
sender.enabled = NO;
[self refreshButtonWidth];
[sender setTitle:[NSString stringWithFormat:@"获取验证码(%zi)", _time] forState:UIControlStateNormal]; 
_timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timeDown) userInfo:nil repeats:YES];
}
- (void)timeDown{ 
_time --;
 if (_time == 0) {
 [_btn setTitle:@"重新获取" forState:UIControlStateNormal]; _btn.enabled = YES; 
[self refreshButtonWidth]; 
[_timer invalidate]; 
_timer = nil; 
_time = 5 ; 
return; 
} 
[_btn setTitle:[NSString stringWithFormat:@"获取验证码(%zi)", _time] forState:UIControlStateNormal];
}

//第二种方法
#pragma mark -点击发送验证码
- (void)sendMessage:(UIButton *)btn{
if (self.phoneField.text.length == 0) { 
[self remindMessage:@"请输入正确的手机号"];
}else{ 
__block int timeout=60; 
//倒计时时间 
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue); dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0);
 //每秒执行 
dispatch_source_set_event_handler(_timer, ^{ 
if(timeout<=0){ 
//倒计时结束，关闭 
dispatch_source_cancel(_timer); dispatch_async(dispatch_get_main_queue(), ^{ 
// 设置界面的按钮显示 根据自己需求设置 
[btn setTitle:@"发送验证码" forState:UIControlStateNormal]; btn.userInteractionEnabled = YES; 
}); 
}else{ 
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%d", seconds];
if ([strTime isEqualToString:@"0"]) {
 strTime = [NSString stringWithFormat:@"%d",60];
 } 
dispatch_async(dispatch_get_main_queue(), ^{ 
//设置界面的按钮显示 根据自己需求设置 
//NSLog(@"____%@",strTime);
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1]; 
[btn setTitle:[NSString stringWithFormat:@"%@秒后重新发送",strTime] forState:UIControlStateNormal];
[UIView commitAnimations]; 
btn.userInteractionEnabled = NO;
 });
 timeout--;
 } 
}); 
dispatch_resume(_timer);
}

效果图

49. UITextField默认占位符是居中显示,让其居上显示

textField.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;

50. 解决同时按两个按钮进两个view的问题

[button setExclusiveTouch:YES];

51. 图片拉伸

UIImage* img=[UIImage imageNamed:@"2.png"];//原图
UIEdgeInsets edge=UIEdgeInsetsMake(0, 10, 0,10);
//UIImageResizingModeStretch：拉伸模式，通过拉伸UIEdgeInsets指定的矩形区域来填充图片
//UIImageResizingModeTile：平铺模式，通过重复显示UIEdgeInsets指定的矩形区域来填充图
img= [img resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch];
self.imageView.image=img;

52. 修改textFieldplaceholder字体颜色和大小

textField.placeholder = @"username is in here!";  
[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];  
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];

53. 修改状态栏字体颜色

只能设置两种颜色，黑色和白色，系统默认黑色
设置为白色方法：
（1）在plist里面添加Status bar style，值为UIStatusBarStyleLightContent（白色）或UIStatusBarStyleDefault（黑 色）
（2）在Info.plist中设置UIViewControllerBasedStatusBarAppearance 为NO

54. 去掉导航栏下边的黑线

[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];

55. 修改pagecontrol颜色

_pageControl.currentPageIndicatorTintColor=SFQRedColor;
_pageControl.pageIndicatorTintColor=SFQGrayColor;

56. 去掉UITableView的section的粘性，使其不会悬停

//有时候使用UITableView所实现的列表，会使用到section，但是又不希望它粘在最顶上而是跟随滚动而消失或者出现
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {  
    if (scrollView == _tableView) {  
        CGFloat sectionHeaderHeight = 36;

        if (scrollView.contentOffset.y <= sectionHeaderHeight && scrollView.contentOffset.y >= 0) {  
            scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);  
        } else if (scrollView.contentOffset.y >= sectionHeaderHeight) {  
            scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);  
        }  
    }  
}

57. 通过2D仿射函数实现小的动画效果(变大缩小) --可用于自定义pageControl中

[UIView animateWithDuration:0.3 animations:^{
       imageView.transform = CGAffineTransformMakeScale(2, 2);
       } completion:^(BOOL finished) {
       imageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
       }];

58. UIImage与字符串互转

//图片转字符串  
-(NSString *)UIImageToBase64Str:(UIImage *) image  
{  
    NSData *data = UIImageJPEGRepresentation(image, 1.0f);  
    NSString *encodedImageStr = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];  
    return encodedImageStr;  
}

//字符串转图片  
-(UIImage *)Base64StrToUIImage:(NSString *)_encodedImageStr  
{  
    NSData *_decodedImageData   = [[NSData alloc] initWithBase64Encoding:_encodedImageStr];  
    UIImage *_decodedImage      = [UIImage imageWithData:_decodedImageData];  
    return _decodedImage;  
}

59. 判断NSString中是否包含中文

-(BOOL)isChinese:(NSString *)str{
    NSString *match=@"(^[\u4e00-\u9fa5]+$)";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF matches %@", match];
    return [predicate evaluateWithObject:str];
}

60. NSDate与NSString的相互转化

-(NSString *)dateToString:(NSDate *)date {
  // 初始化时间格式控制器
  NSDateFormatter *matter = [[NSDateFormatter alloc] init];
  // 设置设计格式
  [matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];
  // 进行转换
  NSString *dateStr = [matter stringFromDate:date];
  return dateStr;
}
-(NSDate *)stringToDate:(NSString *)dateStr {

  // 初始化时间格式控制器
  NSDateFormatter *matter = [[NSDateFormatter alloc] init];
  // 设置设计格式
  [matter setDateFormat:@"yyyy-MM-dd hh:mm:ss zzz"];
  // 进行转换
  NSDate *date = [matter dateFromString:dateStr];
  return date;
}

61、imageView添加手势

     imageview.userInteractionEnabled = YES;
     //tap手势
     UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(event:)];
     [imageview addGestureRecognizer:tapGesture];
    [tapGesture setNumberOfTapsRequired:1];

    - (void)event:(UITapGestureRecognizer *)gesture
    {
        NSLog(@"单击");
    }

62、获取请求连接里边的cookies

#pragma mark //获取请求连接的cookies
     
 [manager POST:urlStr parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
    if (success) {
        success(responseObject);
        
        NSDictionary *fields = [operation.response allHeaderFields]; //afnetworking写法
        NSLog(@"fields = %@",[fields description]);
        // NSURL *url = [NSURL URLWithString:@"http://api.skyfox.org/api-test.php"];
        NSURL *url = [NSURL URLWithString:urlStr];
        //获取cookie方法1
        NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:fields forURL:url];
        NSLog(@"11--%@",cookies);
        //获取cookie方法2
        //NSString *cookieString = [[HTTPResponse allHeaderFields] valueForKey:@"Set-Cookie"];
    }
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    //  NSLog(@"%@", error);
    if (fail) {
        fail();
    }
}];

63图片旋转

   imageView1 .transform=CGAffineTransformMakeRotation(M_PI_2);

64、获取字符串在label中需要的宽度

#pragma mark //获取字符串需要的宽度
 +(CGFloat)ZFYtextWidthFromTextString:(NSString *)text fontSize:(CGFloat)size{
     
     CGSize size1 = [text sizeWithAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:size]}];    //返回计算出的行高
     return size1.width;
 }

65、获取字符串在label中需要的高度

 #pragma mark//获取字符串需要的高度
 +(CGFloat)ZFYtextHeightFromTextString:(NSString *)text width:(CGFloat)textWidth fontSize:(CGFloat)size{
     
     NSDictionary *dict = @{NSFontAttributeName:[UIFont systemFontOfSize:size]};
     CGRect rect = [text boundingRectWithSize:CGSizeMake(textWidth, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:dict context:nil];
     //返回计算出的行高
     return rect.size.height;
 }

66、汉字和Unicode编码转换

#pragma mark//Unicode转汉字   \u5f20\u4e09 → 张三
 - (NSString *)replaceUnicode:(NSString *)unicodeStr {
     //张三  \u5f20\u4e09
     
     NSString *tempStr1 = [unicodeStr stringByReplacingOccurrencesOfString:@"\\u" withString:@"\\U"];
     NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];
     NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""];
     NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];
     NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData
                                                            mutabilityOption:NSPropertyListImmutable
                                                                      format:NULL
                                                            errorDescription:NULL];
     
     //  NSLog(@"Output = %@", returnStr);
     return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"];
 }
#pragma mark//汉字转 Unicode   张三 →  \u5f20\u4e09
 -(NSString *) utf8ToUnicode:(NSString *)string{
     
     NSUInteger length = [string length];
     NSMutableString *s = [NSMutableString stringWithCapacity:0];
     for (int i = 0;i < length; i++){
         unichar _char = [string characterAtIndex:i];
         //判断是否为英文和数字
         if (_char <= '9' && _char >='0'){
             [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
         }else if(_char >='a' && _char <= 'z'){
             [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
         }else if(_char >='A' && _char <= 'Z')
         {
             [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i,1)]];
         }else{
             [s appendFormat:@"\\u%x",[string characterAtIndex:i]];
         }
     }
     return s;
 }

67、获取间隔一天一年一秒之后的时间


#pragma mark //获取相对时间  获取两个月前的时间  -2 为两个月前时间   2为两个月后时间
 - (void)RelativeTime {
     NSDateComponents * components = [[NSDateComponents alloc] init];
     components.month = -2;
     //    components.day = 10;
     //    components.hour = 10;
     NSCalendar * calendar = [NSCalendar currentCalendar];
     
     NSDate * currentDate = [NSDate date];
     NSDate * nextData = [calendar dateByAddingComponents:components toDate:currentDate options:NSCalendarMatchStrictly];
     NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
     
     formatter.dateFormat = @"yyyy年MM月dd日HH时mm分ss秒";
     NSString * str = [formatter stringFromDate:nextData];
     NSLog(@"%@",str);
     
 }

68、打印系统字体库名字

#pragma mark   打印系统字体库 名字
 NSArray *familyNames = [UIFont familyNames];
 for( NSString *familyName in familyNames )
 {
     printf( "Family: %s \n", [familyName UTF8String]);
     
     NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
     for( NSString *fontName in fontNames )
     {
         printf( "\tFont: %s \n", [fontName UTF8String] );
         
     }
 }

69、截取正方形的图片

//截取正方形的图片 centerBool为YES  表示从中心开始截取
+(UIImage*)getSubImage:(UIImage *)image mCGRect:(CGRect)mCGRect centerBool:(BOOL)centerBool{
 /*如若centerBool为Yes则是由中心点取mCGRect范围的图片*/
 
 float imgWidth = image.size.width;
 float imgHeight = image.size.height;
 float viewWidth = mCGRect.size.width;
 float viewHidth = mCGRect.size.height;
 CGRect rect;
 if(centerBool)
     rect = CGRectMake((imgWidth-viewWidth)/2,(imgHeight-viewHidth)/2,viewWidth,viewHidth);
 else{
     if(viewHidth<viewWidth)
     {
         if(imgWidth<= imgHeight)
         {
             rect=CGRectMake(0, 0,imgWidth, imgWidth*viewHidth/viewWidth);
         }else
         {
             float width = viewWidth*imgHeight/viewHidth;
             float x = (imgWidth  - width)/2;
             if(x>0)
             {
                 rect = CGRectMake(x,0,  width, imgHeight);
             }else
             {
                 rect =  CGRectMake(0,  0,  imgWidth, imgWidth*viewHidth/viewWidth);
             }
         }
     }else
     {
         if(imgWidth <= imgHeight)
         {
             float height = viewHidth*imgWidth/viewWidth;
             if(height< imgHeight)
             {
                 rect =CGRectMake(0,  0, imgWidth, height);
             }else
             {
                 rect = CGRectMake(0,  0,viewWidth*imgHeight/viewHidth, imgHeight);
             }
         }else
         {
             float width = viewWidth*imgHeight/viewHidth;
             if(width< imgWidth)
             {
                 float x =  (imgWidth - width)/2;
                 rect =CGRectMake(x,  0,width, imgHeight);
             }else
             {
                 rect =CGRectMake(0,  0,imgWidth, imgHeight);
             }
         }
     }
 }
 
 CGImageRef subImageRef = CGImageCreateWithImageInRect(image.CGImage,rect);
 CGRect smallBounds =CGRectMake(0, 0,CGImageGetWidth(subImageRef),CGImageGetHeight(subImageRef));
 
 UIGraphicsBeginImageContext(smallBounds.size); CGContextRef context =UIGraphicsGetCurrentContext();CGContextDrawImage(context, smallBounds, subImageRef);
 UIImage *smallImage =[UIImage imageWithCGImage:subImageRef];
 UIGraphicsEndImageContext();
 
 return smallImage;
}

70、跳转APPstore

//APPid就是上面的那串数字

NSString  *urlStr = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/app/id%@",APPID];
NSURL *url = [NSURLURLWithString:urlStr];

[[UIApplicationsharedApplication]openURL:url];

71、获取本机APP 版本号

#pragma mark --  //获取本地版本号
     //获取本地版本号
     NSString* thisVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"];

72、获取APP store 项目版本号

#pragma mark -- 获取appstore版本号
-(void)Postpath:(NSString *)path
{
NSString *url = [[NSString alloc] initWithFormat:@"http://itunes.apple.com/lookup?id=%@",@"414478124"];
NSURL *url = [NSURL URLWithString:path];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                       cachePolicy:NSURLRequestReloadIgnoringCacheData
                                                   timeoutInterval:10];

[request setHTTPMethod:@"POST"];


NSOperationQueue *queue = [NSOperationQueue new];

[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response,NSData *data,NSError *error){
    NSMutableDictionary *receiveStatusDic=[[NSMutableDictionary alloc]init];
    if (data) {
        
        NSDictionary *receiveDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
        if ([[receiveDic valueForKey:@"resultCount"] intValue]>0) {
            
            [receiveStatusDic setValue:@"1" forKey:@"status"];
            [receiveStatusDic setValue:[[[receiveDic valueForKey:@"results"] objectAtIndex:0] valueForKey:@"version"]   forKey:@"version"];
        }else{
            
            [receiveStatusDic setValue:@"-1" forKey:@"status"];
        }
    }else{
        [receiveStatusDic setValue:@"-1" forKey:@"status"];
    }
    
    [self performSelectorOnMainThread:@selector(receiveData:) withObject:receiveStatusDic waitUntilDone:NO];
}];  

}  
-(void)receiveData:(id)sender  
{  
NSLog(@"receiveData=%@",sender);  //打印获取到的版本号

}

73、取消所有响应者（关闭所有键盘）

//取消窗口第一响应
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

74、加载html时候让大图不超出屏幕

//css 控制
<head><style>img{width:100%% !important;}</style></head>
//js 控制
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    [webView stringByEvaluatingJavaScriptFromString:     @"var script = document.createElement('script');"
     "script.type = 'text/javascript';"
     "script.text = /"function ResizeImages() { "
         "var myimg,oldwidth,oldheight;"
         "var maxwidth=320;"// 图片宽度
         "for(i=0;i  maxwidth){"
         "myimg.width = maxwidth;"
         "}"
         "}"
         "}/";"
         "document.getElementsByTagName('head')[0].appendChild(script);"];
         [webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];
     }

75、监听textfiled的输入情况

#pragma mark   UITextField   ----监听

[timesField addTarget:self
               action:@selector(textFieldDidChange:)
     forControlEvents:UIControlEventEditingChanged]; // 监听事件

监听事件:

// 监听改变按钮
- (void) textFieldDidChange:(UITextField*) textField {
    
   
}

76、页面跳转返回按钮的文字

///设置push 之后返回按钮的 字体
UIBarButtonItem *backbutton = [[UIBarButtonItem alloc]init];
backbutton.title = @"";
self.navigationItem.backBarButtonItem = backbutton;

77、/跳转之后隐藏返回键

 life.navigationItem.hidesBackButton = YES;

78、计算webview的高

- (void)webViewDidFinishLoad:(UIWebView *)aWebView {
    CGRect frame = aWebView.frame;
    frame.size.height = 1;
    aWebView.frame = frame;
    CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];
    frame.size = fittingSize;
    aWebView.frame = frame;

    NSLog(@"size: %f, %f", fittingSize.width, fittingSize.height);
}

79、设置阴影

  #pragma mark  //设置 阴影
    [[self.calendarView layer] setShadowOffset:CGSizeMake(0, 0)];
    [[self.calendarView  layer] setShadowRadius:3];
    [[self.calendarView  layer] setShadowOpacity:0.4] ;
    [[self.calendarView  layer] setShadowColor:[UIColor blackColor].CGColor];

80、对键盘的监听

#pragma mark 键盘监听

[[NSNotificationCenter defaultCenter] addObserver:self
 
                                         selector:@selector(keyboardWasShown:)
 
                                             name:UIKeyboardWillShowNotification object:nil];

//注册键盘消失的通知

[[NSNotificationCenter defaultCenter] addObserver:self
 
                                         selector:@selector(keyboardWillBeHidden:)
 
                                             name:UIKeyboardWillHideNotification object:nil];

- (void)keyboardWasShown:(NSNotification*)aNotification

{
    
    //键盘高度
    NSDictionary *userInfo = [aNotification userInfo];
    //NSLog(@"%@",userInfo);
    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];
    NSInteger height = keyboardRect.size.height;
    
    CGFloat time = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    
}


-(void)keyboardWillBeHidden:(NSNotification*)aNotification

{
    
    
}

81、禁止webview 滚动

#pragma mark //禁止微webview 上下拖动
UIWebView * d_intro = [[UIWebView alloc] init];
d_intro.delegate = self;
d_intro.dataDetectorTypes = UIDataDetectorTypeLink;
//取消右侧，下侧滚动条，去处上下滚动边界的黑色背景
d_intro.backgroundColor=[UIColor clearColor];
for (UIView *_aView in [d_intro subviews])
{
    if ([_aView isKindOfClass:[UIScrollView class]])
    {
        [(UIScrollView *)_aView setShowsVerticalScrollIndicator:NO];
        //右侧的滚动条
        
        [(UIScrollView *)_aView setShowsHorizontalScrollIndicator:NO];
        //下侧的滚动条
        
        for (UIView *_inScrollview in _aView.subviews)
        {
            if ([_inScrollview isKindOfClass:[UIImageView class]])
            {
                _inScrollview.hidden = YES;  //上下滚动出边界时的黑色的图片
            }
        }
    }
}
[self.view addSubview:d_intro];

82、图片保存本地沙盒、

#pragma mark 图片保存沙盒
- (void)setHeadBgImage
{
    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    //NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths firstObject];
    NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"selfPhoto%d.jpg", [LoginManager sharedManager].userBasicInfo.uid]];
    success = [fileManager fileExistsAtPath:imageFilePath];
    UIImage *image1 = nil;
    if ([LoginManager sharedManager].loginSucess) {
        if (success) {
            NSData *data = [fileManager contentsAtPath:imageFilePath];
            image1 = [UIImage imageWithData:data];
        }
    }else{
        image1 = [UIImage imageNamed:@"account_head_bg"];
    }
    // NSLog(@"%@-%u",imageFilePath,success);
    
    [self setHeadBGImage:image1];
}




- (void)saveImage:(UIImage *)image
{
    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths firstObject];
    NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"selfPhoto%d.jpg", [LoginManager sharedManager].userBasicInfo.uid]];
    success = [fileManager fileExistsAtPath:imageFilePath];
    if (success) {
        success = [fileManager removeItemAtPath:imageFilePath error:&error];
    }
    BOOL result = [UIImagePNGRepresentation(image)writeToFile: imageFilePath    atomically:YES]; // 保存成功会返回YES
    //UIImage *smallImage = [self thumbnailWithImageWithoutScale:image size:CGSizeMake(self.view.frame.size.width, 315)];
    NSLog(@"%@-%u",imageFilePath,result);
    
    [self setHeadBGImage:image];
}

83、图片旋转360度

#pragma mark //旋转360 度 动画
-(void) startAnimation
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.01];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(endAnimation)];
    _rechargeCover.transform = CGAffineTransformMakeRotation(angle * (M_PI / 180.0f));
    NSLog(@"%f",angle * (M_PI / 180.0f));
    [UIView commitAnimations];
    
}
-(void)endAnimation
{
    angle += 10;
    if (angle < 360) {
        [self startAnimation];
    }
    
}

84、常用宏

#define DeviceMaxHeight ([UIScreen mainScreen].bounds.size.height)
#define DeviceMaxWidth ([UIScreen mainScreen].bounds.size.width)
#define widthRate DeviceMaxWidth/320
#define IOS8 ([[UIDevice currentDevice].systemVersion intValue] >= 8 ? YES : NO)
// RGB颜色
#define UIColorFromRGB1(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

85、获取故事版的 vc

UIStoryboard *login = [UIStoryboard storyboardWithName:@"LoginModule" bundle:nil];
AlsNoticeController* alsNoticeController = [login instantiateViewControllerWithIdentifier:@"LoginVC"];
[self.navigationController pushViewController:alsNoticeController animated:YES];

86、设置windows覆盖层

 #pragma mark  //设置覆盖层视图
if (![[NSUserDefaults standardUserDefaults] boolForKey:@"guideFirst"])  {
    _guideCoverView =[[UIView alloc]initWithFrame:self.view.bounds];
    _guideCoverView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];
    UIWindow* currentWindow = [UIApplication sharedApplication].keyWindow;
    [currentWindow addSubview:_guideCoverView];
    

}

87、设置透明度并且不影响子视图

#pragma mark 视图透明度 不影响子视图
alterView.backgroundColor=[[UIColor whiteColor] colorWithAlphaComponent:1];

88、剪切板的复制

#pragma mark 复制到系统剪切版
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];

pasteboard.string = self.label.text;

89、cocoPods常用指令

#pragma mark cocosPods指令
pod install --verbose --no-repo-update

pod list  列出所有可用的第三方库

pod search query 搜包含query的第三方库   注意:这两个命令只搜存在于本地 /Users/yohunl/.cocoapods/ 下的文件

如果搜索网络的,可以先更新本地  pod repo update master,然后再搜索

pod lib create frameworkName  创建一个framework工程

pod lib lint 验证一个podspec文件是否有错误

podinstall --no-repo-update错误 这里的参数—no-repo-update,是告诉cocoapods不要更新repo.有么有感觉每次pod install都很慢,那是因为每一次都会先更新本地的repo,加上此参数,就跳过了这个过程,将会很快

pod init 可以建立一个空的podfile

建立pod的spec文件   pod spec create spec名字  http://www.theonlylars.com/blog/2013/01/20/cocoapods-creating-a-pod-spec/

pod install 命令时会引发许多操作。要想深入了解这个命令执行的详细内容，可以在这个命令后面加上 --verbose

90、背景图片按照某个像素拉伸

  self.messageImage.image = [[UIImage imageNamed:@"bbs_meaasge_frame"] stretchableImageWithLeftCapWidth:150 topCapHeight:20];

来源：oschina

链接：https://my.oschina.net/u/2523541/blog/681498

标签

PageControl

ios

iOS 知识-常用小技巧大杂烩

1. 打印View所有子视图

2. layoutSubviews调用的调用时机

3. NSString过滤特殊字符

4. TransForm属性

5. 去掉分割线多余15像素

6. 计算方法耗时时间间隔

7. Color颜色宏定义

8. Alert提示宏定义

9. 让iOS应用直接退出

10. NSArray 快速求总和 最大值 最小值 和 平均值

10. 修改Label中不同文字颜色

11. 播放声音

12. 检测是否IPad Pro

25. Label行间距

26. UIImageView填充模式

27. 宏定义检测block是否可用

28. Debug栏打印时自动把Unicode编码转化成汉字

29. 设置状态栏文字样式颜色

30. 自动生成模型代码的插件

31. iOS中的一些手势

32. iOS 开发中一些相关的路径

33. 获取 iOS 路径的方法

34. 字符串相关操作

35. CocoaPods pod install/pod update更新慢的问题

36. MRC和ARC混编设置方式

37. 把tableview里cell的小对勾的颜色改成别的颜色

38. 调整tableview的separaLine线的位置

39. 设置滑动的时候隐藏navigationbar

40. 自动处理键盘事件，实现输入框防遮挡的插件

41. Quartz2D相关

42. 屏幕截图

43. 隐藏导航栏上的返回字体

44. 解决tableview的分割线短一截

45. 动态隐藏NavigationBar

46. 设置导航栏透明

47. 设置字体和行间距

48. 点击button倒计时

49. UITextField默认占位符是居中显示,让其居上显示

50. 解决同时按两个按钮进两个view的问题

51. 图片拉伸

52. 修改textFieldplaceholder字体颜色和大小

53. 修改状态栏字体颜色

54. 去掉导航栏下边的黑线

55. 修改pagecontrol颜色

56. 去掉UITableView的section的粘性，使其不会悬停

57. 通过2D仿射函数实现小的动画效果(变大缩小) --可用于自定义pageControl中

58. UIImage与字符串互转

59. 判断NSString中是否包含中文

60. NSDate与NSString的相互转化

61、imageView添加手势

62、获取请求连接里边的cookies

63图片旋转

64、获取字符串在label中需要的宽度

65、获取字符串在label中需要的高度

66、汉字和Unicode编码转换

67、获取间隔一天 一年一秒之后的时间

68、打印系统字体库名字

69、 截取正方形的图片

70、跳转APPstore

71、 获取本机APP 版本号

72、获取APP store 项目版本号

73、取消所有响应者（关闭所有键盘）

74、加载html时候 让大图不超出屏幕

75、监听textfiled的输入情况

76、页面跳转返回按钮的文字

77、/跳转之后隐藏 返回键

78、计算webview的高

79、设置阴影

80、对键盘的监听

81、禁止webview 滚动

82、图片保存本地沙盒、

83、图片旋转360度

84、常用宏

85、获取故事版的 vc

86、设置windows覆盖层

87、设置透明度并且不影响子视图

88、剪切板的复制

89、cocoPods常用指令

10. NSArray 快速求总和最大值最小值和平均值

67、获取间隔一天一年一秒之后的时间

69、截取正方形的图片

71、获取本机APP 版本号

74、加载html时候让大图不超出屏幕

77、/跳转之后隐藏返回键