ios 画虚线

  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]];

    [shapeLayer setStrokeColor:[[UIColor colorWithRed:223/255.0 green:223/255.0 blue:223/255.0 alpha:1.0f] CGColor]];

    // 3.0f设置虚线的宽度 [shapeLayer setLineWidth:1.0f];

    [shapeLayer setLineJoin:kCALineJoinRound];

    // 3=线的宽度 1=每条线的间距

    [shapeLayer setLineDashPattern:

    [NSArray arrayWithObjects:[NSNumber numberWithInt:3],

     [NSNumber numberWithInt:1],nil]];

    // Setup the path

    CGMutablePathRef path = CGPathCreateMutable();

    CGPathMoveToPoint(path, NULL, 0, 89);

    CGPathAddLineToPoint(path, NULL, 320,89);

    // 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, 10);

    CGPathAddLineToPoint(path, NULL, 320,10);

    

    [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 [[self layer] addSublayer:shapeLa

    

    [self.view.layer addSublayer:shapeLayer];