如何使用CAShapeLayer创建圆角 [英] How to create rounded corners with CAShapeLayer

问题描述

有没有办法在 CAShapeLayer 中添加圆角？在我的情况下，我需要形状图层通过 lineDashPattern 创建一个虚线边框。

Is there a way to add rounded corners to a CAShapeLayer? In my case I needed the shape layer to create a dashed border via lineDashPattern.

^注意虚线不是舍入

推荐答案

答案很简单。创建带圆角的贝塞尔路径。

The answer is simple. Create a bezier path with rounded corners.

self.clipsToBounds = YES; 
self.layer.cornerRadius = 10.0;

self.border = [CAShapeLayer layer];
self.border.fillColor = nil;
self.border.path = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:10.0];
self.border.frame = self.bounds;

self.border.strokeColor = [UIColor purpleColor].CGColor;
self.border.lineWidth = borderWidth * 2; // double desired width as half will be clipped
self.border.lineDashPattern = @[@15];

[self.layer addSublayer:self.border];

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