- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    [UIView animateWithDuration: animations:^{

        // 旋转

//        _imageView.layer.transform = CATransform3DMakeRotation(M_PI, 1, 1, 0);

        // 平移

//        _imageView.layer.transform = CATransform3DMakeTranslation(200, 200, 0);

        // 缩放

//        _imageView.layer.transform = CATransform3DMakeScale(1, 0.5, 1);

    // 利用KVC改变形变

//     NSValue *rotation = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI, 1, 1, 0)];

//        [_imageView.layer setValue:rotation forKeyPath:@"transform"];

//        [_imageView.layer setValue:@M_PI forKeyPath:@"transform.rotation"];

//        [_imageView.layer setValue:@0.5 forKeyPath:@"transform.scale"];

        // 平移x轴

        [_imageView.layer setValue:@ forKeyPath:@"transform.translation.x"];

    }];

}

- (void)imageLayer

{

    // 圆形裁剪

    _imageView.layer.cornerRadius = ;

    // 超出layer边框的全部裁剪掉

    _imageView.layer.masksToBounds = YES;

    _imageView.layer.borderColor = [UIColor whiteColor].CGColor;

    _imageView.layer.borderWidth = ;

}

- (void)viewLayer

{

    // 设置阴影透明度

    _redView.layer.shadowOpacity = ;

    // 设置阴影颜色

    _redView.layer.shadowColor = [UIColor yellowColor].CGColor;

    // 设置阴影圆角半径

    _redView.layer.shadowRadius = ;

    // 设置圆角半径

    _redView.layer.cornerRadius = ;

    // 设置边框半径

    _redView.layer.borderColor = [UIColor whiteColor].CGColor;

    // 设置边框半径

    _redView.layer.borderWidth = ;

}