iOS 绘制蚂蚁线(虚线)

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/**
 *  通过 CAShapeLayer 方式绘制虚线
 *
 *  param lineView:       需要绘制成虚线的view
 *  param lineLength:     虚线的宽度
 *  param lineSpacing:    虚线的间距
 *  param lineColor:      虚线的颜色
 *  param lineDirection   虚线的方向  YES 为水平方向, NO 为垂直方向
 **/
- (void)drawLineOfDashByCAShapeLayer:(UIView *)lineView lineLength:(int)lineLength lineSpacing:(int)lineSpacing lineColor:(UIColor *)lineColor lineDirection:(BOOL)isHorizonal {

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];

    [shapeLayer setBounds:lineView.bounds];

    if (isHorizonal) {

        [shapeLayer setPosition:CGPointMake(CGRectGetWidth(lineView.frame) / 2, CGRectGetHeight(lineView.frame))];

    } else{
        [shapeLayer setPosition:CGPointMake(CGRectGetWidth(lineView.frame) / 2, CGRectGetHeight(lineView.frame)/2)];
    }

    [shapeLayer setFillColor:[UIColor clearColor].CGColor];
    //  设置虚线颜色为blackColor
    [shapeLayer setStrokeColor:lineColor.CGColor];
    //  设置虚线宽度
    if (isHorizonal) {
        [shapeLayer setLineWidth:CGRectGetHeight(lineView.frame)];
    } else {

        [shapeLayer setLineWidth:CGRectGetWidth(lineView.frame)];
    }
    [shapeLayer setLineJoin:kCALineJoinRound];
    //  设置线宽,线间距
    [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:lineLength], [NSNumber numberWithInt:lineSpacing], nil]];
    //  设置路径
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 0, 0);

    if (isHorizonal) {
        CGPathAddLineToPoint(path, NULL,CGRectGetWidth(lineView.frame), 0);
    } else {
        CGPathAddLineToPoint(path, NULL, 0, CGRectGetHeight(lineView.frame));
    }

    [shapeLayer setPath:path];
    CGPathRelease(path);
    //  把绘制好的虚线添加上来
    [lineView.layer addSublayer:shapeLayer];
}

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