如何设置cornerRadius只用于UIView的左下角，右下角和左上角？

问题描述

限时删除！！

有没有办法只为UIView的左下角，右下角和左上角设置cornerRadius？

Is there a way to set cornerRadius for only bottom-left,bottom-right and top-left corner of a UIView?

我尝试了以下方法，但它结果让视图消失了。下面的代码有什么问题吗？

I tried the following, but it ended up making the view disappear. Is there anything wrong with the code below?

    UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(20.0, 20.0)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.path = maskPath.CGPath;
    view.layer.mask = maskLayer;

推荐答案

你可以这样做：

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.viewOutlet.bounds byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerBottomLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(10.0, 10.0)];

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.view.bounds;
maskLayer.path  = maskPath.CGPath;
self.viewOutlet.layer.mask = maskLayer;

更新：

如果您需要边框，只需创建另一个 CAShapeLayer 并将其作为子图层添加到视图层。像这样（将此代码放在上面的代码下面）：

Update:
If You need border just create another CAShapeLayer and add it to view's layer as sublayer. Like this (place this code below upper code):

CAShapeLayer *borderLayer = [[CAShapeLayer alloc] init];
borderLayer.frame = self.view.bounds;
borderLayer.path  = maskPath.CGPath;
borderLayer.lineWidth   = 4.0f;
borderLayer.strokeColor = [UIColor blackColor].CGColor;
borderLayer.fillColor   = [UIColor clearColor].CGColor;

[self.viewOutlet.layer addSublayer:borderLayer];

在swift 3.0中如下：

In swift 3.0 like this:

let maskPath = UIBezierPath.init(roundedRect: self.viewOutlet.bounds, byRoundingCorners:[.topLeft, .bottomLeft], cornerRadii: CGSize.init(width: 10.0, height: 10.0))
let maskLayer = CAShapeLayer()
maskLayer.frame = self.viewOutlet.bounds
maskLayer.path = maskPath.cgPath
self.viewOutlet.layer.mask = maskLayer

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