我可以观察一个UIViewController改变interfaceOrientation吗？ [英] Can I observe when a UIViewController changes interfaceOrientation?

问题描述

如果我有一个指向UIViewController的指针，当我改变interfaceOrientation而不修改控制器的代码时，我可以得到通知吗？

If I have a pointer to a UIViewController, can I be notified when it changes interfaceOrientation without modifying the code of the controller?

推荐答案

您可以使用NSNotificationCenter：

You can use NSNotificationCenter :

 [[NSNotificationCenter defaultCenter] addObserver:self // put here the view controller which has to be notified
                                         selector:@selector(orientationChanged:)
                                             name:@"UIDeviceOrientationDidChangeNotification" 
                                           object:nil];
- (void)orientationChanged:(NSNotification *)notification{  
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

    //do stuff
    NSLog(@"Orientation changed");          
}

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