iOS檢測屏幕旋轉

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
    UIDeviceOrientationUnknown,
    UIDeviceOrientationPortrait,            // Device oriented vertically, home button on the bottom
    UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top
    UIDeviceOrientationLandscapeLeft,       // Device oriented horizontally, home button on the right
    UIDeviceOrientationLandscapeRight,      // Device oriented horizontally, home button on the left
    UIDeviceOrientationFaceUp,              // Device oriented flat, face up
    UIDeviceOrientationFaceDown             // Device oriented flat, face down
} __TVOS_PROHIBITED;

具體實現以下

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    

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

- (void)handleDeviceOrientationDidChange:(UIInterfaceOrientation)interfaceOrientation
{
    //1.獲取 當前設備 實例
    UIDevice *device = [UIDevice currentDevice] ;
    
    
    
    
    /**
     *  2.取得當前Device的方向，Device的方向類型爲Integer
     *
     *  必須調用beginGeneratingDeviceOrientationNotifications方法後，此orientation屬性纔有效，不然一直是0。orientation用於判斷設備的朝向，與應用UI方向無關
     *
     *  @param device.orientation
     *
     */
    
    switch (device.orientation) {
        case UIDeviceOrientationFaceUp:
            NSLog(@"屏幕朝上平躺");
            break;
            
        case UIDeviceOrientationFaceDown:
            NSLog(@"屏幕朝下平躺");
            break;
            
            //系統無法判斷目前Device的方向，有多是斜置
        case UIDeviceOrientationUnknown:
            NSLog(@"未知方向");
            break;
            
        case UIDeviceOrientationLandscapeLeft:
            NSLog(@"屏幕向左橫置");
            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(@"沒法辨識");
            break;
    }
    
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIDeviceOrientationDidChangeNotification
                                                  object:nil
     ];
    
    [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];
}