layoutSubviews中判断横竖屏

在ContentView中重写layoutSubviews方法，然后根据stausbar的方向判断当前视图的横竖屏。具体代码：
-(void)layoutSubviews{ 
[super layoutSubviews]; 
UIDeviceOrientation interfaceOrientation=[[UIApplication sharedApplication] statusBarOrientation]; 
if (interfaceOrientation == UIDeviceOrientationPortrait || interfaceOrientation == UIDeviceOrientationPortraitUpsideDown) { 
　　//翻转为竖屏时 
}else if (interfaceOrientation==UIDeviceOrientationLandscapeLeft || interfaceOrientation == UIDeviceOrientationLandscapeRight) { 
　　//翻转为横屏时 
} 
}