视图切换的几种方法

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    //切换方法1
    //动画效果：左右滑动
    //必须有导航器视图才能切换
    [self.navigationController pushViewController:[[ViewController2 alloc]init] animated:YES];
    
    //切换方法2：
    //动画效果：从下滑动到上遮盖住之前的视图,如果有导航栏也被遮盖住了
    ViewController2 *controller = [[ViewController2 alloc]init];
    [self presentViewController:controller animated:YES completion:NULL];
    
    //切换方法3：
    //动画效果：上下的翻动，上下左右的转动，保留导航栏
    //必须都是子视图
    ViewController2 *controller1 = [[ViewController2 alloc]init];
    ViewController2 *controller2 = [[ViewController2 alloc]init];
    [self addChildViewController:controller1];
    [self.view addSubview:controller1.view];

    [self addChildViewController:controller2];
    [self.view addSubview:controller2.view];
    
    
    
    [self transitionFromViewController:controller1
                      toViewController:controller2
                              duration:1
                               options:UIViewAnimationOptionTransitionCurlDown
                            animations:^{}
                            completion:^(BOOL finished) {}];

}