暂时在Swift中创建一个ImageView - Multi-Touch

Question

前言：我对swift和ios Dev非常陌生。请善待。

我想创建一个突出显示用户触摸区域的图像。

到目前为止，我有这个：

// Dictionary that holds my image view per touch
var allImgViews : [Int : UIImageView] = [:]

 override func touchesBegan(touches: NSSet, withEvent event: UIEvent)
{
    var image = UIImage(named: "dot.png");
    var imgView = UIImageView(image: image);


    for fing : AnyObject in touches
    {
        let loc = fing.locationInView(self.view);

        imgView.frame = CGRect(x: loc.x, y: loc.y, width: 100, height: 100);
        self.view.addSubview(imgView);

        // ----- PROBLEM -------
        // need to find a way to store the touched point imgView ...
        // such that when touchsEnded is reached, only the point ended will
        // vanish. This will also allow for multitouching.

    }

}

从这里我有touchesEnded方法（理论上）将使用键获取正确的imgView，并执行removeFromSuperview（）方法，从而在用户抬起手指时删除图标。我无法找到一个好的密钥来解决这个问题。而且我不确定这是否是处理多点触控的正确方法。

感谢。