IOS视图跳转(xcode9.1 Object-C)

陌路散爱 提交于 2020-02-21 18:12:10
  1. 首先新建一个ViewController,通过file->new file,选择Cocoa Touch Class,名字例如为TmpViewController, 基类为UIViewController,注意勾选xib,启动时要用到:
    在这里插入图片描述
    在这里插入图片描述
    在主ViewController中添加一个按钮,通过按钮启动TmpViewController:
- (IBAction)jump:(id)sender {
    NSLog(@"jump to new view");
    TmpViewController *tvc = [[TmpViewController alloc]initWithNibName:@"TmpViewController" bundle:nil];
    [self.navigationController pushViewController:tvc animated:YES];
    //[self presentViewController:tvc animated:YES completion:nil];
}

我们可以发现,可以通过presentViewController 启动新的界面,但是却无法通过navigationController 来启动新页面,这是因为默认情况下,navigationController是nil的,需要设置应用的navigationController,同时设置首页(主view):
AppDelegate.h中修改为:

#import <UIKit/UIKit.h>
#import "ViewController.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) ViewController *viewController;

@property (strong, nonatomic) UINavigationController *navController;
@end

AppDelegate.m的didFinishLaunchingWithOptions中添加:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
    //self.viewController = [[ViewController alloc]init];
    UIStoryboard *mainStory = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    self.viewController = [mainStory instantiateViewControllerWithIdentifier:@"ViewController"];
    UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:self.viewController];
    self.window.rootViewController = navi;
    [self.window makeKeyAndVisible];
    return YES;
}

这里需要注意的是,xcode9默认的viewcontroller是没有xib的,想要的UI是Main.storyboard,所以要通过UIStoryboard来初始化viewController,注意大小写,同时在Main.storyboard中注意添加Identifier名称:
在这里插入图片描述
再看我们的跳转接口:

- (IBAction)jump:(id)sender {
    NSLog(@"jump to new view");
    TmpViewController *tvc = [[TmpViewController alloc]initWithNibName:@"TmpViewController" bundle:nil];
    [self.navigationController pushViewController:tvc animated:YES];
    //[self presentViewController:tvc animated:YES completion:nil];
}

这里initWithNibName,这里对应的是xib,如果没有xib,会直接异常,这也是为什么AppDelegate不用initWithNibName来初始化主view的原因。

参考:

https://blog.csdn.net/u012605629/article/details/52122586

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