[[UIDevice currentDevice]beginGeneratingDeviceOrientationNotifications];    //建立通知中心

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

-(void)orientationChanged:(NSNotification *)notification{

UIDeviceOrientation orientation=[[UIDevice currentDevice]orientation];

switch (orientation) {

case UIDeviceOrientationFaceUp:

NSLog(@"设备正面朝上");

break;

case UIDeviceOrientationFaceDown:

NSLog(@"设备正面朝下");

break;

case UIDeviceOrientationPortrait:

NSLog(@"设备处于正常朝向,主屏幕按钮在下方");

break;

case UIDeviceOrientationPortraitUpsideDown:

NSLog(@"设备处于纵向,主屏幕按钮在上方");

break;

case UIDeviceOrientationLandscapeLeft:

NSLog(@"设备侧立,左边朝下");

break;

case UIDeviceOrientationLandscapeRight:

NSLog(@"设备侧立,右边朝下");

break;

default:

break;

}

}