transform

- (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);

}

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