要是不是很懂的话,可以直接看上一片关于runtime的介绍。
应用场景1:坑爹的服务器是不是经常返回一些null数据给你,特别是数组还有字典,然后每次你接收到数据进行转码再到model之后,调出model的数组的时候,总是要写上一些判断,
[model.array isKindOfClass:[NSArray class]] && model.array.count > 0)
原则上讲是这样写比较严谨,问题是写出来的代码很臃肿,自己都很难接受,我懒!不加上去的话,往NSNull调用不存在的方法,直接Crash,又要被扣工资的节奏。。。最佳解决方法:使用swizzleInstanceMethod。代码直接见Demo:https://github.com/caijunrong/JRExtension.git
应用场景2:对于公司原来的一些代码,想对UIButton的点击事件做一部分修改,但是如果使用继承出来的UIBtton来解决的话, 又要改大量的代码,这时候,使用runtime拦截替换发送点击事件的方法可以迅速解决这个问题,超级给力!
不废话,直接上代码
//
// UIControl+UIControl_XY.h
// iOSanimation
//
// Created by biyabi on 15/9/29.
// Copyright © 2015年 caijunrong. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UIControl (UIControl_XY)
@property (nonatomic, assign) NSTimeInterval cjr_acceptEventInterval;// 可以用这个给重复点击加间隔
@end
//
// UIControl+UIControl_XY.m
// iOSanimation
//
// Created by biyabi on 15/9/29.
// Copyright © 2015年 caijunrong. All rights reserved.
//
#import "UIControl+UIControl_XY.h"
#import <objc/runtime.h>
@interface UIControl()
@property (nonatomic, assign) NSTimeInterval cjr_acceptEventTime;
@end
@implementation UIControl (UIControl_XY)
static const char *UIControl_acceptEventInterval = "UIControl_acceptEventInterval";
static const char *UIControl_acceptEventTime = "UIControl_acceptEventTime";
- (NSTimeInterval )cjr_acceptEventInterval{
return [objc_getAssociatedObject(self, UIControl_acceptEventInterval) doubleValue];
}
- (void)setCjr_acceptEventInterval:(NSTimeInterval)cjr_acceptEventInterval{
objc_setAssociatedObject(self, UIControl_acceptEventInterval, @(cjr_acceptEventInterval), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (NSTimeInterval )cjr_acceptEventTime{
return [objc_getAssociatedObject(self, UIControl_acceptEventTime) doubleValue];
}
- (void)setCjr_acceptEventTime:(NSTimeInterval)cjr_acceptEventTime{
objc_setAssociatedObject(self, UIControl_acceptEventTime, @(cjr_acceptEventTime), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
+ (void)load{
//获取着两个方法
Method systemMethod = class_getInstanceMethod(self, @selector(sendAction:to:forEvent:));
SEL sysSEL = @selector(sendAction:to:forEvent:);
Method myMethod = class_getInstanceMethod(self, @selector(cjr_sendAction:to:forEvent:));
SEL mySEL = @selector(cjr_sendAction:to:forEvent:);
//添加方法进去
BOOL didAddMethod = class_addMethod(self, sysSEL, method_getImplementation(myMethod), method_getTypeEncoding(myMethod));
//如果方法已经存在了
if (didAddMethod) {
class_replaceMethod(self, mySEL, method_getImplementation(systemMethod), method_getTypeEncoding(systemMethod));
}else{
method_exchangeImplementations(systemMethod, myMethod);
}
//----------------以上主要是实现两个方法的互换,load是gcd的只shareinstance,果断保证执行一次
}
- (void)cjr_sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event{
if (NSDate.date.timeIntervalSince1970 - self.cjr_acceptEventTime < self.cjr_acceptEventInterval) {
return;
}
if (self.cjr_acceptEventInterval > 0) {
self.cjr_acceptEventTime = NSDate.date.timeIntervalSince1970;
}
[self cjr_sendAction:action to:target forEvent:event];
}
@end
@interface ALViewController ()
@property (nonatomic, strong) UIButton *;
@end
@implementation AutoLayoutViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.suggessBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[self.suggessBtn addTarget:self action:@selector(clickWithInterval:) forControlEvents:UIControlEventTouchUpInside];
self.suggessBtn.cjr_acceptEventInterval = 5.0f;
}
- (void)clickWithInterval:(UIButton *)suButton{
NSLog(@"打印出来--"):
}
来源:oschina
链接:https://my.oschina.net/u/2430867/blog/512383