Model view controller 模态视图控制器

我在Xcode中使用以下代码在iPhone应用程序的两个视图之间水平翻转

 -(IBAction)switchView:(id)sender{
    Algorithm2ViewController *Algorithm2ViewControllergo = [[Algorithm2ViewController    alloc]
                                                            initWithNibName:@"Algorithm2ViewController"                                                    bundle:nil];

    [UIView beginAnimations:@"flipview" context:nil];
    [UIView setAnimationDuration:1];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft 
                           forView:self.view cache:NO];
    [self.view addSubview:Algorithm2ViewControllergo.view];

    [UIView commitAnimations];
}

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在第一次翻转之后，在翻转完成之前，我在背景中获得了一个即将到来的视图的图像。我如何摆脱它？

我在第二个视图中找到了这一点添加以下代码

-(IBAction)switchView2:(id)sender{

    SecondViewController *SecondViewControllergo = [[SecondViewController alloc]
                                                    initWithNibName:@"SecondView"
                                                    bundle:nil];

    [UIView beginAnimations:@"flipview" context:nil];
    [UIView setAnimationDuration:2];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft 
                           forView:self.view.superview cache:NO];
    [self.view addSubview:SecondViewControllergo.view];
    [self.view removeFromSuperview];
    [UIView commitAnimations]; 
    [SecondViewControllergo release];


}

“从superview中删除”行将删除背景图像