- (IBAction)leftRotate {

    // 1.取得头像按钮

    UIButton *head = (UIButton *)[self.view viewWithTag:10];

    // 2.向左旋转45°

    // 45  180

    // 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);

}

- (IBAction)up {

    // 1.取得头像按钮

    UIButton *head = (UIButton *)[self.view viewWithTag:10];

    // 2.每次向上移动100的距离

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

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

}

- (IBAction)big {

    // 1.取得头像按钮

    UIButton *head = (UIButton *)[self.view viewWithTag:10];

    // 2.增大

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

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

}