Question

一旦我的WKWebView加载完毕，我就会拉出绝对URL，如果匹配，我会在屏幕上加载一个按钮。

正如预期的那样，在我到达匹配网址之前它不会出现，这就是我想要的行为。

但是，如果我离开页面，按钮仍然存在，我无法理解为什么。

有没有人有任何想法：

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {

        if (webView.url?.absoluteString == "https://www.myurl.co.uk/product/clock") {


            let settingsButton = UIButton(type: .custom)
            view.addSubview(settingsButton)
            settingsButton.backgroundColor = UIColor.purple;                   
            settingsButton.translatesAutoresizingMaskIntoConstraints = false
            settingsButton.widthAnchor.constraint(equalToConstant: 56).isActive = true
            settingsButton.heightAnchor.constraint(equalToConstant: 56).isActive = true
            settingsButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -14).isActive = true
            settingsButton.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 14).isActive = true
            settingsButton.setNeedsLayout()
            settingsButton.layoutIfNeeded()
            settingsButton.layer.cornerRadius = 0.5 * settingsButton.bounds.size.width
            settingsButton.setImage(UIImage(named:"AR"), for: .normal)
            settingsButton.clipsToBounds = true
            settingsButton.backgroundColor = UIColor.purple
            settingsButton.addTarget(self, action: #selector(ViewController.buttonTapped2(_:)), for: UIControlEvents.touchUpInside)


    }else {
            settingsButton.removeFromSuperview()
}

Answer 1

我通过将我的删除方法更改为：

来解决这个问题

func RemoveButton() {

    for view in self.view.subviews {

        if view.isKind(of: UIButton.self) {
            view.removeFromSuperview()
        }



    }

WKWebView didFinish Navigation似乎只被调用一次

1 个答案: