如何仅为 UIView 的左下角、右下角和左上角设置cornerRadius? [英] how to set cornerRadius for only bottom-left,bottom-right and top-left corner of a UIView?

问题描述

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?

我尝试了以下操作，但最终导致视图消失.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 并将其添加到视图层作为子层.像这样(将此代码放在上面的代码下方):

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 中是这样的:

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

这篇关于如何仅为 UIView 的左下角、右下角和左上角设置cornerRadius?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！