Question

我试图获取初始视图（back_button）以在网页完全加载后将其自身删除，我做了很多研究，它们始终指向同一代码作为答案。但是，我的不会被呼叫。有人可以告诉我我在做什么错吗？

import UIKit
import WebKit

class ViewController: UIViewController {


    @IBOutlet weak var LoadingView: UIImageView!
    var webView: WKWebView?
    var bgImage: UIImageView?
    var imageViewObject :UIImageView?

    override func viewDidLoad() {
        super.viewDidLoad()

        //var imageViewObject :UIImageView

        let screenSize: CGRect = UIScreen.main.bounds
        imageViewObject = UIImageView(frame:CGRect(x:0,y: 0, width: screenSize.width, height: screenSize.height))
        imageViewObject?.image = UIImage(named:"back_image")
        webView?.navigationDelegate = self as? WKNavigationDelegate
        self.view.addSubview(imageViewObject!)
        let myURL = URL(string: "https://www.google.com")
        let myRequest = URLRequest(url: myURL!)
        _ = webView?.load(myRequest)
    }

    override func loadView() {
        super.loadView()

        //self.view.sendSubview(toBack: imageViewObject)
        //self.view = self.LoadingView
        self.webView = WKWebView()
        self.view = self.webView

    }

    @IBAction func BackButton(_ sender: Any) {

        if(webView?.canGoBack)!
        {
            webView?.goBack();
        }
    }



    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        print("TEST")
        imageViewObject?.removeFromSuperview()
    }


     func webViewDidFinishLoad(webView: WKWebView) {
        imageViewObject?.removeFromSuperview()
        self.view = self.webView

     }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

Answer 1

您必须通过将这一行代码放入viewDidLoad来符合它的协议委托

webView?.delegate = self

这样做之后，现在，如果要使用委托方法，则必须将viewController作为UIWebViewDelegate的子类

class ViewController: UIViewController ,UIWebViewDelegate{

Answer 2

我通过

修复了此问题

webView?.naviationDelegate = self

并将其添加到类

class ViewController: UIViewController ,WKNavigationDelegate

webView didFinish导航从未调用

2 个答案: