IOS横屏事件

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(deviceOrientationDidChange:)

name:UIDeviceOrientationDidChangeNotification

object:nil];

-(void)deviceOrientationDidChange:(NSObject*)sender{

UIDevice* device = [sender valueForKey:@"object"];

NSLog(@"%d",device.orientation);

}