最近做项目，项目中大量出现六边形视图，包括基本的视图和按钮。详情查看Demo

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切割六边形

1.首先我们来切割一下直角的六边形

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extension UIView {
    
    /// 切割六边形（没有弧度）
    public func setSixRightBorder() {
        /// 获取切割路径
        let maskPath = getSexanglePath()
        
        /// 创建切割路径Layer
        let maskLayer = CAShapeLayer()
        maskLayer.path = maskPath.cgPath
        self.layer.mask = maskLayer
    }
    
    private func getSexanglePath() -> UIBezierPath {
        let PI = CGFloat.pi
        /// 整个视图的框
        let allWidth = self.bounds.size.width
        /// 整个视图的高
        let allHeight = self.bounds.size.height
        /// 我们假设六边形的内角是120度
        let operateAngle = PI - 2*PI/3
        /// 线段b的长度为
        let bLength = allHeight/2
        /// 所以如图线段a的长度为
        let aLength = bLength/tan(operateAngle)
        /// P1点坐标为
        let p1 = CGPoint(x: allWidth - aLength, y: 0)
        /// P2点坐标为
        let p2 = CGPoint(x: allWidth, y: bLength)
        /// P2点坐标为
        let p3 = CGPoint(x: p1.x, y: allHeight)
        /// 同理可求出 对应左边的3个点坐标
        let p4 = CGPoint(x: aLength, y: allHeight)
        /// P5点坐标为
        let p5 = CGPoint(x: 0, y: bLength)
        /// P6点坐标为
        let p6 = CGPoint(x: aLength, y: 0)
        
        let path = UIBezierPath()
        path.move(to: p1)
        path.addLine(to: p2)
        path.addLine(to: p3)
        path.addLine(to: p4)
        path.addLine(to: p5)
        path.addLine(to: p6)
        path.close()
        return path
    }
}

20210309224845823.png

这里可以看到留个角是没有圆弧的，那么如何产生最上方效果图中的形状呢，接下来我们开始讲解

切割带弧度的六边形

20210309230212914.png

这里是核心代码

/// 定义PI值
        let PI = CGFloat(Double.pi)
        /// 弧度半径
        let radius: CGFloat = radius
        /// 视图的宽
        let allWidth = self.bounds.size.width
        /// 视图的高
        let allHeight = self.bounds.size.height
        /// 视图高度的一半
        let LayerHeigh = self.bounds.size.height/2
        /// 六边形的一个内角度数（这里默认是正六边形 所以一个角是120度）
        let sixDegree: CGFloat = PI*2/3
        let operateDegree:CGFloat = PI - sixDegree
        /// 圆弧与上边线的切点 到左上角的距离
        let distance = radius / tan(operateDegree)
        /// 左边定点到左上角之间的X狙击
        let maxDistance = LayerHeigh / tan(operateDegree)
        
        
        /// 计算第一个点
        let firstPointX = allWidth - (maxDistance + distance)
        let firstPoint = CGPoint(x: firstPointX, y: 0)
        
        /// 计算第二个点
        let secondPointX = firstPointX + distance + distance*cos(operateDegree)
        let secondPointY = distance*sin(operateDegree)
        let secondPoint = CGPoint(x: secondPointX, y: secondPointY)
        
        /// 计算第三个点
        let thirdPointX = allWidth - distance*cos(operateDegree)
        let thirdPointY = LayerHeigh - distance*sin(operateDegree)
        let thirdPoint = CGPoint(x: thirdPointX, y: thirdPointY)
        
        /// 计算第四个点
        let fourPointY = LayerHeigh + distance*sin(operateDegree)
        let fourPoint = CGPoint(x: thirdPointX, y: fourPointY)
        
        /// 计算第五个点
        let fivePointY = allHeight - secondPoint.y
        let fivePoint = CGPoint(x: secondPoint.x, y: fivePointY)
        
        /// 计算第六个点
        let sixPoint = CGPoint(x: firstPoint.x, y: allHeight)
        
        /// 第七个点
        let sevenPointX = maxDistance + distance
        let sevenPoint = CGPoint(x: sevenPointX, y: allHeight)
        
        /// 第八个点
        let eightPointX = maxDistance  - distance*cos(operateDegree)
        let eightPoint = CGPoint(x: eightPointX, y: fivePointY)
        
        /// 第九个点
        let ninePointX = distance*cos(operateDegree)
        let ninePoint = CGPoint(x: ninePointX, y: fourPointY)
        
        /// 第十个点
        let tenPoint = CGPoint(x: ninePointX, y: thirdPointY)
        
        /// 第十一个点
        let elevenPoint = CGPoint(x: eightPoint.x, y: secondPoint.y)
        
        /// 第十二个点
        let twelvePoint = CGPoint(x: sevenPoint.x, y: 0)
        
        /// 第一个圆弧圆心坐标
        let center1 = CGPoint(x: firstPoint.x, y: radius)
        /// 第二个圆弧圆心坐标
        let center2 = CGPoint(x: allWidth - distance/cos(operateDegree), y: LayerHeigh)
        /// 第三个圆弧圆心坐标
        let center3 = CGPoint(x: sixPoint.x, y: allHeight - radius)
        /// 第四个圆弧圆心坐标
        let center4 = CGPoint(x: sevenPoint.x, y: allHeight - radius)
        /// 第五个圆弧圆心坐标
        let center5 = CGPoint(x: distance/cos(operateDegree), y: LayerHeigh)
        /// 第六个圆弧圆心坐标
        let center6 = CGPoint(x: twelvePoint.x, y: radius)
        let path = UIBezierPath()
        path.move(to: firstPoint)
        path.addArc(withCenter: center1, radius: radius, startAngle: CGFloat(-PI/2), endAngle: operateDegree - PI/2, clockwise: true)
        path.addLine(to: thirdPoint)
        path.addArc(withCenter: center2, radius: radius, startAngle: CGFloat(-operateDegree/2), endAngle: operateDegree/2, clockwise: true)
        path.addLine(to: fivePoint)
        path.addArc(withCenter: center3, radius: radius, startAngle: operateDegree/2, endAngle: PI/2, clockwise: true)
        path.addLine(to: sevenPoint)
        path.addArc(withCenter: center4, radius: radius, startAngle: PI/2, endAngle: PI/2 + operateDegree, clockwise: true)
        path.addLine(to: ninePoint)
        path.addArc(withCenter: center5, radius: radius, startAngle: PI - operateDegree/2, endAngle: PI + operateDegree/2, clockwise: true)
        path.addLine(to: elevenPoint)
        path.addArc(withCenter: center6, radius: radius, startAngle: PI + operateDegree/2, endAngle: PI*3/2, clockwise: true)
        path.close()

效果图

20210309233032124.png

末尾附上Demo。如果你觉得有帮助，请多多Star，好了结束撒花，大家加油❀❀❀❀❀