请问如何在ios中绘制一条荧光线呢

请问如何在ios中绘制一条荧光线呢？尝试了好多方法都不可行，感谢，感谢
之前使用UIBezierPath来画线

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    //获取触摸点
    UITouch *touch = touches.anyObject;
    CGPoint locp = [touch locationInView:touch.view];
    //创建路径
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:locp];
    path.lineCapStyle = kCGLineCapRound;
    path.lineJoinStyle = kCGLineJoinRound;
    path.lineWidth = 2;
    //
    [self.arrM addObject:path];
}

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = touches.anyObject;
    CGPoint locp2 = [touch locationInView:touch.view];
    [self.arrM.lastObject addLineToPoint:locp2];

    [self setNeedsDisplay];
}

- (void)drawRect:(CGRect)rect {
    for (UIBezierPath *bez in self.arrM) {
        [[UIColor redColor] set];
        [bez stroke];
    }
}

很简单,给你画的线设置下阴影就可以了,荧光效果就是一个实心的线和这条线的阴影,一般是白色的线,彩色的阴影