ipad上自定义view的旋转适配

ios8横屏时宽高会自动转换，但是ios7不是

CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;

CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height;

if (!iOS8)

{

UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];

if (UIInterfaceOrientationIsLandscape(interfaceOrientation))

{

CGFloat tmp = screenWidth;

screenWidth = screenHeight;

screenHeight = tmp;

}

}