static inline CGSize screenSize()
{
    CGSize screenSize = [UIScreen mainScreen].bounds.size;
    if ((NSFoundationVersionNumber <= NSFoundationVersionNumber_iOS_7_1) && UIInterfaceOrientationIsLandscape(getOrientation())) {
        return CGSizeMake(screenSize.height, screenSize.width);
    } else {
        return screenSize;
    }
}