iOS监听设备方向的方法

1.添加监听函数 
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; 
        [[NSNotificationCenter defaultCenter] addObserver:self 
         
                                                 selector:@selector(deviceOrientationDidChange:) 
         
                                                     name:UIDeviceOrientationDidChangeNotification 
         
                                                   object:nil]; 
2.得到设备对象 
  -(void)deviceOrientationDidChange:(NSObject*)sender{ 
    UIDevice* device = [sender valueForKey:@"object"]; 
    NSLog(@"%d",device.orientation); 
    
}