顺时针旋转 90度

 label.transform = CGAffineTransformMakeRotation(90 *M_PI / 180.0);

顺时针 旋转180度

 label.transform = CGAffineTransformMakeRotation(180 *M_PI / 180.0);

顺时针旋转270度

 label.transform = CGAffineTransformMakeRotation(270 *M_PI / 180.0);

CGAffineTransform transform = label.transform;

transform = CGAffineTransformScale(transform, 2,0.5);//前面的2表示横向放大2倍，后边的0.5表示纵向缩小一半  

label.transform = transform;

UIView 的旋转和缩放