iOS uiview 旋转

 CGAffineTransform transform = CGAffineTransformMakeRotation(90 * M_PI/180.0);
    [play  setTransform:transform];
    CGRect rect = play.frame;
    CGPoint center = play.center;
    play.frame = CGRectMake(0,0, rect.size.height, rect.size.width);
    play.center = center;