Question

所以我已经达到了基于从JSON返回的数组量以编程方式创建UIViews的程度。一切似乎都没问题，除了应该为每个视图添加点击的循环，但它只是将它添加到一个视图。仅打印在最后一个UIView上。

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)
    }

}

经过一些试验......

为每个循环添加了点击识别器：

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

动作在点击时的动作：

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

Answer 1

在视图循环开始之前，您只有一个UITapGestureRecognizer。 AFAIK，点击手势识别器一次只能附加到一个视图。查看this question。要解决此问题，请尝试编写以下行：

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

在视图循环中。

<小时/> 要找出被点击的视图，请让您的选择器handleTap采取如下的参数：

Selector("handleTap:")

和方法本身是这样的：

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

循环UITapGestureRecognizer仅添加到最后一个而不是全部

1 个答案: