如何绘制一个三角形的UIButton [英] How to draw a triangle shaped UIButton

问题描述

我真的挖了IFTTT右下角的按钮，如图（右下图）所示。

I really dig the IFTTT bottom right corner button, as shown in the image (bottom right).

我尝试过使用 CGContext 和 UIBezierPath 来匹配效果，但是我只是不知道该怎么做。有人对如何实现此目标有任何想法/代码吗？

I tried playing around with CGContext and UIBezierPath to match the effect, but i simply don't know enough to get this right. Does anyone have some thoughts/code on how to make this happen?

谢谢！

推荐答案

首先使用CAShapeLayer创建遮罩

First use a CAShapeLayer to create a mask

CAShapeLayer * shapeLayer = [CAShapeLayer layer];
//Use these to create path
CGMutablePathRef path = CGPathCreateMutable();
// CGPathMoveToPoint
// CGPathAddLines
shapeLayer.path = path;

然后设置按钮的遮罩

yourbutton.layer.mask = shapeLayer
yourbutton.masksToBounds = YES;

视图示例

  CAShapeLayer * shapeLayer = [CAShapeLayer layer];
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, nil, 0, CGRectGetHeight(self.testview.frame));
CGPathAddLineToPoint(path, nil, CGRectGetWidth(self.testview.frame), 0);
CGPathAddLineToPoint(path, nil, CGRectGetWidth(self.testview.frame), CGRectGetHeight(self.testview.frame));
CGPathCloseSubpath(path);
shapeLayer.path = path;
self.testview.layer.masksToBounds = YES;
self.testview.layer.mask = shapeLayer;

和屏幕截图：

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