我可以观察UIViewController何时更改i​​nterfaceOrientation？

Question

如果我有一个指向UIViewController的指针,是否可以在更改interfaceOrientation时通知我而不修改控制器的代码？

我最好选择检测设备方向的变化,然后看看UIViewController是否会旋转(d)？

Answer 1

您可以使用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");          
}