利用CAShapeLayer绘制多条平行的虚线

for (int i = 0; i < 5; i ++ ) {

CAShapeLayer *shapeLayer = [CAShapeLayer layer];

CGRect rect = shapeLayer.frame;

rect.origin.y = 50*(i+1);

shapeLayer.frame = rect;

//设置虚线颜色

[shapeLayer setStrokeColor:[UIColor redColor].CGColor];

[shapeLayer setLineJoin:kCALineJoinRound];

//设置虚线的线宽及间距

[shapeLayer setLineDashPattern:[NSArray arrayWithObjects:@5,@2,nil]];

//创建虚线绘制路径

CGMutablePathRef path = CGPathCreateMutable();

//设置虚线绘制路径起点

CGPathMoveToPoint(path, NULL, 0, 0);

//设置虚线绘制路径终点

CGPathAddLineToPoint(path, NULL,self.view.frame.size.width, 0);

//设置虚线绘制路径

[shapeLayer setPath:path];

CGPathRelease(path);

[self.view .layer addSublayer:shapeLayer];

}