迅捷3-不会调用declated函数

Question

I'm learning Switf 3 on Xcode 8 now and I got stuck on a little app which basically just shows a webpage in a webView element. The only addtion function I try to realize is that external urls get open as shared application (eg. Safari).

As there are plenty example in SO I think I found all the elements I need to make it working, but somehow the func webView which checks the url doesn't get called.

Here is my code form the ViewController.swif so far:

import UIKit

class ViewController: UIViewController, UIWebViewDelegate {

    @IBOutlet weak var webView: UIWebView!
    override func viewDidLoad() {
        super.viewDidLoad()
        self.webView.delegate = self;
        let url = URL(string: "https://stackoverflow.com")
        debugPrint(url!)
        webView.loadRequest(URLRequest(url: url!))
    }

    // [...]

    func webView(webView: UIWebView!, shouldStartLoadWithRequest request: URLRequest!, navigationType: UIWebViewNavigationType) -> Bool {
        debugPrint("func webView has been called")
        debugPrint(request.url!)
        if navigationType == UIWebViewNavigationType.linkClicked {
            if (request.url!.host! == "stackoverflow.com"){
                return true
            } else {
                //UIApplication.sharedApplication().openURL(request.URL!)
                UIApplication.shared.open(request.url!)
                return false
            }
        }
        return true
    }
}

Where is my logistical mistake?

Answer 1

Try this

EDIT

func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
        debugPrint("func myWebView has been called")
        debugPrint(request.url!)
        if navigationType == UIWebViewNavigationType.linkClicked {
            if (request.url!.host! == "stackoverflow.com"){
                return true
            } else {
                //UIApplication.sharedApplication().openURL(request.URL!)
                UIApplication.shared.open(request.url!)
                return false
            }
        }
        return true
    }

Answer 2

Swift 3中的委托方法的签名是错误的：

func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool