ipad - CALayer 隐藏 imageView

Question

海都在使用 CALayer 来掩盖 UIImage，当我在 imageview 上添加图层时，它只显示图层部分隐藏所有填充白色的图像

        CALayer *mask = [CALayer layer];
        mask.contents = (id)[[UIImage imageNamed:@"mask.png"] CGImage];
        mask.frame = CGRectMake(0, 0, mainImageWidth+30, mainImageHeight);
        mask.shadowOffset = CGSizeMake(0, 3);
        mask.shadowOpacity = 1.5;

        mainImageView.layer.mask = mask;


        [mainImageView.layer setMasksToBounds:NO];

它隐藏了我的图像视图，除了图层部分。我该如何解决这个问题

Answer 1

我没有使用图像视图创建蒙版，而是为 UIView 添加了三个蒙版，现在它的工作完美

 mainLayer.frame = CGRectMake(0, 0, mainImageWidth, mainImageHeight);
[self.view.layer addSublayer:mainLayer];
 mainLayer.backgroundColor = [UIColor clearColor].CGColor;


secondLayer.frame = CGRectMake(gloss_x, gloss_y, gloss_w, gloss_h);
maskLayer = [CALayer layer];

UIImage *mask = [UIImage imageNamed:@"mask.png"];
maskLayer.contents = (id)mask.CGImage;
maskLayer.frame =  maskRect;//CGRectMake(gloss_x, gloss_y-50, gloss_w, gloss_h);



secondLayer.contents = (id)s_glossImage.CGImage;


[mainLayer addSublayer:secondLayer];

mainLayer.mask = maskLayer;


[mainImageView.layer addSublayer:mainLayer];

现在它工作正常。