iOS：使用UIBezierPath屏蔽UIImage [英] iOS: Mask a UIImage using UIBezierPath

问题描述

我试图掩盖图像，以便我只能给它两个圆角。使用我拥有的代码，它只是在图像上添加白色的蒙版，但似乎不适用它。我需要做些什么来掩盖图像边角？

I am trying to mask an image so that I can give it only two rounded corners. With the code that I have it just adds the mask in white over the image, but doesn't seem to apply it. What do I need to do different to mask the image corners?

CAShapeLayer *maskLayer = [CAShapeLayer layer];
UIBezierPath *roundedPath = [UIBezierPath bezierPathWithRoundedRect:maskLayer.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(16.f, 16.f)];    
maskLayer.fillColor = [[UIColor whiteColor] CGColor];
maskLayer.backgroundColor = [[UIColor clearColor] CGColor];
maskLayer.path = [roundedPath CGPath];

// Add mask
self.imageView.layer.mask = maskLayer;

推荐答案

UIView的两个角落

如上所述链接问题，您可能需要在应用其掩码之前从层次结构中删除该视图。

As mentioned in the above linked question, you probably need to remove the view from the heirarchy before applying its mask.

[self.imageView removeFromSuperview];
self.imageView.layer.mask = maskLayer;
[self.view addSubview:self.imageView];

此外，您的 maskLayer 没有边界。您需要将其设置为您尝试屏蔽的视图的框架（或边界）。

Also, your maskLayer has no bounds. You need to set it to the frame (or bounds) of the view you're trying to mask.

CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = self.imageView.frame;

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