iOS 监听设备方向旋转(iOS 9)

typedef NS_ENUM(NSInteger, VFOrientation) {
    VFOrientationPortrait = 1,
    VFOrientationLandscape = -1,
};

// 处理设备旋转
- (void)viewWillTransitionToSize:(CGSize)size 
withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator{
    
    NSLog(@"T ^ T");
    if ([self isPortraitOrLandscape:size] == VFOrientationPortrait) {
        // do something
    }
    
    if ([self isPortraitOrLandscape:size] == VFOrientationLandscape) {
        // do something
    }
    
}

- (VFOrientation) isPortraitOrLandscape:(CGSize)size {
    
    return (size.width > size.height ? VFOrientationLandscape : 
                                        VFOrientationPortrait);
    
}

- (void) addDeviceRotateObserver {
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(rotateViews:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:nil];
}

- (void) rotateViews:(NSObject *)sender {
    
    UIDevice* device = [sender valueForKey:@"object"];
    NSLog(@"%d",device.orientation);
    
 //   switch (device.orientation) {
 //       case UIDeviceOrientationPortrait: {
//            NSLog(@"P");
//            break;
//        }
//        case UIDeviceOrientationLandscapeLeft: {
//            NSLog(@"LL");
//            break;
//        }
//        case UIDeviceOrientationLandscapeRight: {
//            NSLog(@"LR");
//            break;
//        }
//        default:
//            break;
//    }
    
    switch (device.orientation) {
        case UIDeviceOrientationUnknown: {
            // do something
            break;
        }
        case UIDeviceOrientationPortrait: {
            // do something
            break;
        }
        case UIDeviceOrientationPortraitUpsideDown: {
            // do something
            break;
        }
        case UIDeviceOrientationLandscapeLeft: {
            // do something
            break;
        }
        case UIDeviceOrientationLandscapeRight: {
            // do something
            break;
        }
        case UIDeviceOrientationFaceUp: {
            // do something
            break;
        }
        case UIDeviceOrientationFaceDown: {
            // do something
            break;
        }
    }
}

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

- (void)dealloc {
    [self removeDeviceRotateObserver];
}

http://blog.csdn.net/jpcfei/article/details/8995531