ios6 – 检测UIViewController上的接口旋转,即使未在 – (NSUInteger)supportedInterfaceOrientations中定义

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

    //No reason to ask Nsnotification because it many cases `userInfo` equals to
    //@{UIDeviceOrientationRotateAnimatedUserInfoKey = 1;}
    [[NsnotificationCenter defaultCenter] addObserver:self SELEctor:@SELEctor(deviceDidRotatE) name:@UIDeviceOrientationDidChangeNotification object:nil];
}

要取消注册接收设备旋转事件,请使用此选项(例如,在viewWillDisappear中)：

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];

    [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
    [[NsnotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}

这是deviceDidRotate函数的一个例子：

- (void)deviceDidRotate {
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

    switch (orientation) {
        case UIDeviceOrientationPorTrait:
        case UIDeviceOrientationPorTraitUpsideDown:
            // do something for porTrait orientation
            break;
        case UIDeviceOrientationLandscapeLeft:
        case UIDeviceOrientationLandscapeRight:
            // do something for landscape orientation
            break;

        default:
            break;
    }
}