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1.绘制虚线
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
[shapeLayer setBounds:self.view.bounds];
[shapeLayer setPosition:self.view.center];
[shapeLayer setFillColor:[[UIColor clearColor] CGColor]];
// 设置虚线颜色为blackColor
[shapeLayer setStrokeColor:[[UIColor blackColor] CGColor]];
// 3.0f设置虚线的宽度
[shapeLayer setLineWidth:3.0f];
[shapeLayer setLineJoin:kCALineJoinRound];
// 3=线的宽度 1=每条线的间距
[shapeLayer setLineDashPattern:
[NSArray arrayWithObjects:[NSNumber numberWithInt:3],
[NSNumber numberWithInt:3],nil]];
// Setup the path
CGMutablePathRef path = CGPathCreateMutable();
// 0,10代表初始坐标的x,y
// 320,10代表初始坐标的x,y
CGPathMoveToPoint(path, NULL, 0, 100);
CGPathAddLineToPoint(path, NULL, 320,100);
[shapeLayer setPath:path];
CGPathRelease(path);
// 可以把self改成任何你想要的UIView, 下图演示就是放到UITableViewCell中的
[view.layer addSublayer:shapeLayer];
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原文地址:http://www.cnblogs.com/lhx2015/p/4913978.html