transform 用法

UIButton *head;

   // 角度是正数:顺时针,角度是负数:逆时针

//    head.transform = CGAffineTransformMakeRotation(-M_PI_4);

    head.transform =CGAffineTransformRotate(head.transform,M_PI_4);

    // 2.每次向上移动100的距离

//    head.transform = CGAffineTransformMakeTranslation(0, -100);

    head.transform =CGAffineTransformTranslate(head.transform,0, -100);

   

    // 3.缩放

//    head.transform = CGAffineTransformMakeScale(1.5, 1.5);

    head.transform =CGAffineTransformScale(head.transform,1.5, 1.5);