在iPad上的UIInterfaceOrientation期间更改UIViews [英] Changing UIViews during UIInterfaceOrientation on iPad

问题描述

我试图更改旋转角度，因为从肖像到风景，我的观点必须有显着差异。现在，我正在使用的代码可以运行一次，然后在尝试向后旋转时应用程序冻结。任何一个方向都没有影响。例如：如果我在风景中并旋转以纵向，则一切正常，直到我旋转回风景，然后它冻结，并且绝对不执行任何操作。

I am trying to change views on rotation because my views have to be significantly different from portrait to landscape. Now the code I am using works once then the app freezes when trying to rotate back. Either direction does not make a difference. For example: If I am in Landscape and rotate to portrait everything works great until I rotate back to landscape then it freezes and does absolutely nothing.

这是我用来实现此目的的代码

Here is the code I am using to achieve this

在我的 viewDidLoad方法中

In my "viewDidLoad" method

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];      
[[NSNotificationCenter defaultCenter] addObserver:self  
                                         selector:@selector(didRotate:)  
                                             name:UIDeviceOrientationDidChangeNotification   
                                           object:nil];      

然后我将其称为轮换：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

- (void)didRotate:(NSNotification *)notification  
{          
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];  

    if ((orientation == UIDeviceOrientationLandscapeLeft) ||
        (orientation == UIDeviceOrientationLandscapeLeft))
    {  
        // present the other viewController, it's only viewable in landscape  
        [self.view addSubview:landScapeView];
    }

    if ((orientation == UIDeviceOrientationLandscapeRight) ||
        (orientation == UIDeviceOrientationLandscapeRight))
    {  
        // present the other viewController, it's only viewable in landscape  
        [self.view addSubview:landScapeView];
    }  
    else if ((orientation == UIDeviceOrientationPortrait ||
             (orientation == UIDeviceOrientationPortrait))
    {
        // get rid of the landscape controller  
        [self.view addSubview:portrait];
    }  
    else if ((orientation == UIDeviceOrientationPortraitUpsideDown ||
             (orientation == UIDeviceOrientationPortraitUpsideDown))
    {
        // get rid of the landscape controller  
        [self.view addSubview:portrait];
    }  
}

推荐答案

您正在旋转时添加特定于方向的视图，但从不删除其他视图，因此您需要这样做。

You are adding your orientation specific view at the rotate but never removing the other one so you need.

// get rid of the landscape controller  
    ((orientation == UIDeviceOrientationPortraitUpsideDown || orientation == 
UIDeviceOrientationPortraitUpsideDown)) {

[landScapeView removeFromSuperview];      
[self.view addSubview:portrait];
    }  

在另一个方向上类似。

请记住，要从超级视图版本中删除，因此您需要在外部保留两个视图。

Bear in mind that removing from superview releases so you need to have both views externally retained.

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