最好的特点就是可以自定义路径，设置圆角和描边都很方便，以下为代码和效果，均在playground中实现
1、首先实现一个圆角矩形，并对此路径描边，为其绘制一个轮廓。
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//: Playground - noun: a place where people can playimport UIKitclass MyView : UIView{ override func drawRect(rect: CGRect) { var pathRect = UIEdgeInsetsInsetRect(self.bounds, UIEdgeInsetsMake(1, 1, 1, 1)) var path = UIBezierPath(roundedRect: pathRect, cornerRadius: 10) path.lineWidth = 4 UIColor.greenColor().setFill() UIColor.blackColor().setStroke() path.fill() path.stroke() }}let viewRect = CGRect(x: 0, y: 0, width: 100, height: 100)let myEmptyView = MyView(frame:viewRect) |
tips：所有绘制操作都是按照调用顺序进行的。在本段代码中，我在填充矩形后再对其进行描边。如果交换对path.fill()和path.stroke()的调用顺序，将会得到一个稍有不同的结果，绿色填充将会略微覆盖黑色描边，效果图如下。
2、下面自定义一条路径，确定几个点，然后像画笔一样连线！
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//: Playground - noun: a place where people can playimport UIKitclass MyView : UIView{ override func drawRect(rect: CGRect) { var bezierPath = UIBezierPath() //创建一个矩形，它的所有边都内缩5% var drawingRect = CGRectInset(self.bounds, self.bounds.size.width*0.05, self.bounds.size.height*0.05) //确定组成绘画的点 var topLeft = CGPointMake(CGRectGetMinX(drawingRect), CGRectGetMinY(drawingRect)) var topRight = CGPointMake(CGRectGetMaxX(drawingRect), CGRectGetMinY(drawingRect)) var bottomLeft = CGPointMake(CGRectGetMinX(drawingRect), CGRectGetMaxY(drawingRect)) var bottomRight = CGPointMake(CGRectGetMaxX(drawingRect), CGRectGetMaxY(drawingRect)) var center = CGPointMake(CGRectGetMidX(drawingRect), CGRectGetMinY(drawingRect)) //开始绘制 bezierPath.moveToPoint(topLeft) bezierPath.addLineToPoint(topRight) bezierPath.addLineToPoint(bottomLeft) bezierPath.addCurveToPoint(bottomRight, controlPoint1: center, controlPoint2: center) //使路径闭合，结束绘制 bezierPath.closePath() //设定颜色，并绘制它们 UIColor.redColor().setFill() UIColor.blackColor().setStroke() bezierPath.fill() bezierPath.stroke() }}let viewRect = CGRect(x: 0, y: 0, width: 100, height: 100)let myEmptyView = MyView(frame:viewRect) |
3、多条子路径也可以。
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//: Playground - noun: a place where people can playimport UIKitclass MyView : UIView{ override func drawRect(rect: CGRect) { //创建一条空Bezier路径 let bezierPath = UIBezierPath() //为两个组成部分定义矩形 let squareRect = CGRectInset(rect, rect.size.width*0.45, rect.size.height*0.05) let circleRect = CGRectInset(rect, rect.size.width*0.3, rect.size.height*0.3) let cornerRadius : CGFloat = 20 //创建路径 let circlePath = UIBezierPath(ovalInRect: circleRect) let squarePath = UIBezierPath(roundedRect: squareRect, cornerRadius: cornerRadius) //将它们添加到主路径 squarePath.appendPath(circlePath) bezierPath.appendPath(squarePath) //设定颜色并绘制它们 UIColor.redColor().setFill() //绘制路径 bezierPath.fill() }}let viewRect = CGRect(x: 0, y: 0, width: 100, height: 100)let myEmptyView = MyView(frame:viewRect) |
以上就是UIBezierPath的基本用法，用好了将是绘制图形的又一利器。