检测手机的屏幕方向

检测手机的屏幕方向：

一、在需要检测的页面里的ViewDidLoad方法里注册通知：

    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleDeviceOrientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];

二、检测设备方向的回调方法

- (void)handleDeviceOrientationDidChange:  (UIInterfaceOrientation)interfaceOrientation {

    UIDevice *device = [UIDevice currentDevice];

    switch (device.orientation) {

        case UIDeviceOrientationFaceUp:

            NSLog(@"屏幕朝上平躺");

            break;

        case UIDeviceOrientationFaceDown:

            NSLog(@"屏幕朝下平躺");

            break;

        case UIDeviceOrientationUnknown:

            NSLog(@"未知方向");

            break;

        case UIDeviceOrientationLandscapeLeft: {

            NSLog(@"屏幕向左横置");

        }

            break;

        case UIDeviceOrientationLandscapeRight:

            NSLog(@"屏幕向右橫置");

            break;

        case UIDeviceOrientationPortrait: {

            NSLog(@"屏幕直立");

        }

            break;

        case UIDeviceOrientationPortraitUpsideDown:

            NSLog(@"屏幕直立，上下顛倒");

            break;

        default:

            NSLog(@"无法辨识");

            break;

    }

}

三、注销 Device

- (void)dealloc{

     [[NSNotificationCenter defaultCenter] removeObserver:self];

      [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];

}