iOS 生成虚线

 -(void)showLine:(UIView *)view
{
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    [shapeLayer setBounds:view.bounds];
    [shapeLayer setPosition:CGPointMake(CGRectGetWidth(view.frame) / 2, CGRectGetHeight(view.frame))];
    //设置虚线颜色
    [shapeLayer setStrokeColor:HEXCOLOR(0x999999).CGColor];
    shapeLayer.lineWidth = 0.5;
    //设置虚线的线宽及间距
    [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:5], [NSNumber numberWithInt: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, CGRectGetWidth(view.frame), 0);
    //设置虚线绘制路径
    [shapeLayer setPath:path];
    CGPathRelease(path);
    //添加虚线
    [view.layer addSublayer:shapeLayer];
}

注：如果你Masonry中使用虚线，如下操作：

-(void)layoutSublayersOfLayer:(CALayer *)layer{
    
    [super layoutSublayersOfLayer:layer];
    //虚线
    [self showLine:self.view];
}