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
}
}