如何讓willAnimateRotationToInterfaceOrientation對所有可見視圖有效？

原問題來自於CSDN問答頻道，更多解決方案見：http://ask.csdn.net/questions/2108

問題描述：

在應用中有幾個UIViewController。其中一個willAnimateRotationToInterfaceOrientation 事件調用成功了。

如何讓willAnimateRotationToInterfaceOrientation對所以可見視圖有效？

解決方案：

RootViewController中:

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    NSDictionary *userInfo = @{
        @"toInterfaceOrientation":@(toInterfaceOrientation),
        @"duration":@(duration)};
    [[NSNotificationCenter defaultCenter] postNotificationName:@"willAnimateRotationToInterfaceOrientation" object:nil userInfo:userInfo];
}

其他的 UIViewControllers:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willAnimateRotationToInterfaceOrientation:) name:@"willAnimateRotationToInterfaceOrientation" object:nil];
    }
    return self;
}

- (void)willAnimateRotationToInterfaceOrientation:(NSNotification *)notification {
    UIInterfaceOrientation toOrientation = (UIInterfaceOrientation)[notification.userInfo[@"toOrientation"] intValue];
    NSTimeInterval duration = (UIInterfaceOrientation)[notification.userInfo[@"duration"] floatValue];
    [self willAnimateRotationToInterfaceOrientation:toOrientation duration:duration];
}

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration {
    // ...
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [super dealloc];
}