swift - 循环 UITapGestureRecognizer 只添加到最后一个而不是全部

Question

所以我要根据从 JSON 返回的数组的数量以编程方式创建 UIView。一切似乎都正常，除了应该将水龙头添加到每个 View 的循环，但它只将它添加到一个 View 。仅在最后一个 UIView 上打印。

func addsubviews(howmany: Int) -> Void{
    let tap = UITapGestureRecognizer(target: self, action: Selector("handleTap"))

for x in 1...howmany{

    guard let v = UINib(nibName: "DealsView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as? UIView else { return }

    v.translatesAutoresizingMaskIntoConstraints = false
    guard let lbl = v.viewWithTag(99) as? UILabel else { return }
    lbl.text = "Here is a new Label for Loop: " + "\(x)"

    self.allContainer.addSubview(v)

    v.backgroundColor = UIColor.white

    var horizontalConstratint1 = NSLayoutConstraint()
    var horizontalConstratint2 = NSLayoutConstraint()
    var verticalConstraint1 = NSLayoutConstraint()

    heightConstraint = v.heightAnchor.constraint(equalToConstant: 100)
    horizontalConstratint1 = v.leadingAnchor.constraint(equalTo: (v.superview?.leadingAnchor)!, constant: 10)
    horizontalConstratint2 = v.trailingAnchor.constraint(equalTo: (v.superview?.trailingAnchor)!, constant: -10)

    if prevView == nil{
        verticalConstraint1 = v.topAnchor.constraint(equalTo: (v.superview?.topAnchor)!, constant: 20)
        }else
    {
        if let pv = prevView as? UIView {
           verticalConstraint1 = v.topAnchor.constraint(equalTo: (pv.bottomAnchor), constant: 20)
        }
    }
    NSLayoutConstraint.activate([horizontalConstratint1,horizontalConstratint2,verticalConstraint1])

    prevView = v
        }

    if let pv = prevView as? UIView {
        print("final constratint")
        NSLayoutConstraint.activate([
            self.allContainer.bottomAnchor.constraint(equalTo: pv.bottomAnchor, constant: 20)
            ])
    }

    for views in self.allContainer.subviews{
        print("adding views")
        views.addGestureRecognizer(tap)
    }

}

经过反复试验...

为每个循环添加的敲击识别器:

        let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(sender:)))

将在点击时进行操作的操作:

func handleTap(sender: UITapGestureRecognizer) {
    // You can get the view here by writing
    let myv = sender.view
    print(myv)
}

Answer 1

在 View 循环开始之前，您只有一个 UITapGestureRecognizer。 AFAIK，点击手势识别器一次只能附加到一个 View 。查看this question .要解决这个问题，请尝试编写以下行:

let tap = UITapGestureRecognizer(target: self, action: Selector("handleTap"))

在你的 View 循环中。

---

要找出点击了哪个 View ，请让您的选择器 handleTap 接受如下参数:

Selector("handleTap:")

方法本身是这样的:

func handleTap(sender: UITapGestureRecognizer? = nil) {
    // You can get the view here by writing
    let v = sender.view
}