iphone – 使用CALayer绘制虚线

概述我使用以下代码绘制一个虚线框： CAShapeLayer *shapeLayer = [CAShapeLayer layer];CGRect shapeRect = CGRectMake(0.0f, 0.0f, 200.0f, 100.0f);[shapeLayer setBounds:shapeRect];[shapeLayer setPosition:CGPointMake(self.c 我使用以下代码绘制一个虚线框：

CAShapeLayer *shapeLayer = [CAShapeLayer layer];CGRect shapeRect = CGRectMake(0.0f,0.0f,200.0f,100.0f);[shapeLayer setBounds:shapeRect];[shapeLayer setposition:CGPointMake(self.coreImageVIEw_.frameX,self.coreImageVIEw_.frameBottom - self.coreImageVIEw_.frameHeight/2)];[shapeLayer setFillcolor:[[UIcolor clearcolor] CGcolor]];[shapeLayer setstrokecolor:[[UIcolor whitecolor] CGcolor]];[shapeLayer setlinewidth:2.0f];[shapeLayer setlineJoin:kCAlineJoinRound];[shapeLayer setlineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:5],[NSNumber numberWithInt:5],nil]];

现在如果我想从点X到点B绘制一条虚线，那我应该如何修改这个代码？

解决方法 通过首先将路径移动到线的起始点，然后将线段添加到点来绘制线条：

CGContextBeginPath(context);CGContextMovetoPoint(context,10.5f,10.5f);CGContextAddlinetoPoint(context,20.5f,20.5f);CGContextClosePath(context);CGContextDrawPath(context,kCGPathFillstroke);

对于绘制虚线，您需要使用CAShapeLayer

CAShapeLayer *shapeLayer = [CAShapeLayer layer];[shapeLayer setBounds:self.bounds];[shapeLayer setposition:self.center];[shapeLayer setFillcolor:[[UIcolor clearcolor] CGcolor]];[shapeLayer setstrokecolor:[[UIcolor blackcolor] CGcolor]];[shapeLayer setlinewidth:3.0f];[shapeLayer setlineJoin:kCAlineJoinRound];[shapeLayer setlineDashPattern: [NSArray arrayWithObjects:[NSNumber numberWithInt:10],nil]];// Setup the pathCGMutablePathref path = CGPathCreateMutable();CGPathMovetoPoint(path,NulL,10,10);CGPathAddlinetoPoint(path,100,100);[shapeLayer setPath:path];CGPathRelease(path);[[self layer] addSublayer:shapeLayer];

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