IOS 形变

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// CGAffineTransformTranslate 位置移动，改变frame中original的坐标点,但是center值没变，因此如果要发生形变的话，不能在此基础上改变，这时必须通过改变center的值来实现位置移动// CGAffineTransformScale 按比例改变frame中size的大小// CGAffineTransformRotate 旋转// C和OC语言里，case中不能定义变量- (IBAction)actionEvent:(UIButton *)sender {    CGAffineTransform transform;    CGPoint center;    switch (sender.tag) {        case 0:            center = _imageView.center;            center.y -= 10;//            NSLog(@"%@",NSStringFromCGPoint(_imageView.center));//            NSLog(@"%@",NSStringFromCGPoint(_imageView.frame.origin));//            transform = CGAffineTransformTranslate(_imageView.transform, 10, 10);//            _imageView.transform = transform;//            NSLog(@"%@",NSStringFromCGPoint(_imageView.frame.origin));//            NSLog(@"%@",NSStringFromCGPoint(_imageView.center));            break;        case 1:            center = _imageView.center;            center.y += 10;            break;        case 2:            center = _imageView.center;            center.x -= 10;            break;        case 3:            center = _imageView.center;            center.x += 10;            break;        case 4:            transform = CGAffineTransformScale(_imageView.transform, 1.2, 1.2);            break;        case 5:            transform = CGAffineTransformScale(_imageView.transform, 1/1.2, 1/1.2);            break;        case 6:            transform = CGAffineTransformRotate(_imageView.transform, M_PI_4);            break;        case 7:            transform = CGAffineTransformRotate(_imageView.transform, -M_PI_4);            break;                    default:            break;    }    if (sender.tag < 4) {        [UIView beginAnimations:nil context:nil];        [UIView setAnimationDuration:1.0];        _imageView.center = center;        [UIView commitAnimations];    } else {        [UIView beginAnimations:nil context:nil];        [UIView setAnimationDuration:1.0];        _imageView.transform = transform;        [UIView commitAnimations];    }}

IOS中形变默认的锚点是中心点，对应的属性是center，但是通过CGAffineTransformTranslate 属性来实现位置移动，是改变frame中original的坐标点,但是center值没变（其实应该是需要改变的，但是不知道苹果为啥没改变，这个有待考究），因此如果要发生形变（放大，缩小，旋转）的话，不能在此基础上改变，这时必须通过改变center的值来实现位置移动

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