Iphone 如何阻止mainView旋转？

我有这个代码，设置为当手机旋转到横向时显示时钟视图，然后当手机返回到纵向时返回主视图。但当它返回到纵向时，纵向视图处于横向模式。我该如何解决这个问题？这是我的密码

-(void)willAnimateRotationToInterfaceOrientation(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    UIInterfaceOrientation toOrientation = self.interfaceOrientation;

    if(toOrientation == UIInterfaceOrientationPortrait)
    {
        self.view = mainView;
    }

    else if(toOrientation == UIInterfaceOrientationLandscapeLeft)
    {
        self.view = clockView;
    }

    else if (toOrientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        self.view = mainView;
    }

    else if(toOrientation == UIInterfaceOrientationLandscapeRight)
    {
        self.view = clockView;
    }
}

---

最好将mainView和clockView作为视图控制器的子视图：

// in viewDidLoad do [self.view addSubView:mainView]; [self.view addSubView:clockView]; clockView.hidden = YES;

-(void)willAnimateRotationToInterfaceOrientation: (UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    if(UIInterfaceOrientationIsPortrait(toOrientation)) {
        mainView.hidden = NO;
        clockView.hidden = YES;
    }
    else {
        mainView.hidden = YES;
        clockView.hidden = NO;
    }
}

这样，两个视图都会以正确的方式自动旋转，您的问题应该会消失