为什么WKWebView没有打开target =“_ blank”的链接？

Question

WKWebView没有打开任何包含target="_blank" a.k.a.在他们的HTML <a href>-Tag中的“在新窗口中打开”属性的链接。

Answer 1

我的解决方案是取消导航并再次使用loadRequest加载请求。这将是类似于UIWebView的行为，它始终在当前帧中打开新窗口。

首先，您需要实现WKUIDelegate。并将其设置为_webview.UIDelegate。然后执行：

- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures
{

  if (!navigationAction.targetFrame.isMainFrame) {

    [webView loadRequest:navigationAction.request];
  }

  return nil;
}

Answer 2

解

allen huang answer

细节

xCode 9.2，Swift 4

完整样本与推目标=“_空白”链接

import UIKit
import WebKit

class ViewController: UIViewController {

    var urlString = "http://google.com"
    var webView: WKWebView!
    fileprivate var webViewIsInited = false
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillLayoutSubviews() {
        if !webViewIsInited {
            webViewIsInited = true
            if webView == nil {
                webView = WKWebView(frame: UIScreen.main.bounds, configuration: WKWebViewConfiguration())
            }

            view.addSubview(webView)
            webView.navigationDelegate = self
            webView.uiDelegate = self
            webView.loadUrl(string: urlString)
        }
    }
}

extension ViewController: WKNavigationDelegate {

    func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {
        decisionHandler(.allow)
    }

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        if let host = webView.url?.host {
            self.navigationItem.title = host
        }
    }
}

extension ViewController: WKUIDelegate {

    func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
        if navigationAction.targetFrame == nil {
            let vc = ViewController()
            vc.urlString = navigationAction.request.url?.absoluteString ?? "http://google.com"
            vc.view.frame = UIScreen.main.bounds
            vc.webView = WKWebView(frame: UIScreen.main.bounds, configuration: configuration)
            navigationController?.pushViewController(vc, animated: false)
            return vc.webView
        }
        return nil
    }
}

extension WKWebView {

    func loadUrl(string: String) {
        if let url = URL(string: string) {
            if self.url?.host == url.host {
                self.reload()
            } else {
                load(URLRequest(url: url))
            }
        }
    }
}

Answer 3

这对我有用：

-(WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {

if (!navigationAction.targetFrame.isMainFrame) {


    WKWebView *newWebview = [[WKWebView alloc] initWithFrame:self.view.frame configuration:configuration];
    newWebview.UIDelegate = self;
    newWebview.navigationDelegate = self;
    [newWebview loadRequest:navigationAction.request];
    self.view = newWebview;

    return  newWebview;
}

return nil;
}

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {

    decisionHandler(WKNavigationActionPolicyAllow);
}

- (void)webViewDidClose:(WKWebView *)webView {
    self.view = self.webView;
}

正如你所看到的，我们在这里做的只是用新网址打开一个新的webView并控制被关闭的可能性，就好像你需要从第一个显示second webviewto的响应一样。

Answer 4

来自@Cloud Xu的答案是正确的答案。仅供参考，这里是Swift：

// this handles target=_blank links by opening them in the same view
func webView(webView: WKWebView!, createWebViewWithConfiguration configuration: WKWebViewConfiguration!, forNavigationAction navigationAction: WKNavigationAction!, windowFeatures: WKWindowFeatures!) -> WKWebView! {
    if navigationAction.targetFrame == nil {
        webView.loadRequest(navigationAction.request)
    }
    return nil
}

Answer 5

使用最新版本的Swift 4.2+

import WebKit

使用WKUIDelegate扩展您的课程

为webview设置委托

self.webView.uiDelegate = self

实施协议方法

func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
    if navigationAction.targetFrame == nil {
        webView.load(navigationAction.request)
    }
    return nil
}

Answer 6

将自己添加为WKNavigationDelegate

_webView.navigationDelegate = self;

并在委托回调decisionPolicyForNavigationAction：decisionHandler中实现以下代码：

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    //this is a 'new window action' (aka target="_blank") > open this URL externally. If we´re doing nothing here, WKWebView will also just do nothing. Maybe this will change in a later stage of the iOS 8 Beta
    if (!navigationAction.targetFrame) { 
        NSURL *url = navigationAction.request.URL;
        UIApplication *app = [UIApplication sharedApplication];
        if ([app canOpenURL:url]) {
            [app openURL:url];
        }
    }
    decisionHandler(WKNavigationActionPolicyAllow);
}

P.S。：这段代码来自我的小项目STKWebKitViewController，它围绕WKWebView包装了一个可用的UI。

Answer 7

如果您已经设置了WKWebView.navigationDelegate

WKWebView.navigationDelegate = self;

你只需要实现：

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    BOOL shouldLoad = [self shouldStartLoadWithRequest:navigationAction.request]; // check the url if necessary

    if (shouldLoad && navigationAction.targetFrame == nil) {
        // WKWebView ignores links that open in new window
        [webView loadRequest:navigationAction.request];
    }

    // always pass a policy to the decisionHandler
    decisionHandler(shouldLoad ? WKNavigationActionPolicyAllow : WKNavigationActionPolicyCancel);
}

这样您就不需要实现WKUIDelegate方法了。

Answer 8

这些解决方案都不适合我，我确实解决了这个问题：

1）实现WKUIDelegate

@interface ViewController () <WKNavigationDelegate, WKUIDelegate>

2）设置wkWebview的UIDelegate委托

self.wkWebview.UIDelegate = self;

3）实现createWebViewWithConfiguration方法

- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {

if (!navigationAction.targetFrame.isMainFrame) {
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [[UIApplication sharedApplication] openURL:[navigationAction.request URL]];
}
return nil;  }

Answer 9

我确认Bill Weinman的Swift代码是正确的。但是需要提一下，你还需要委托UIDelegate才能使用它，以防你不熟悉像我这样的iOS开发人员。

像这样的东西：

self.webView?.UIDelegate = self

因此，有三个地方需要进行更改。

Answer 10

您还可以推送另一个视图控制器，或打开一个新选项卡等：

func webView(webView: WKWebView, createWebViewWithConfiguration configuration: WKWebViewConfiguration, forNavigationAction navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
    var wv: WKWebView?

    if navigationAction.targetFrame == nil {
        if let vc = self.storyboard?.instantiateViewControllerWithIdentifier("ViewController")  as? ViewController {
            vc.url = navigationAction.request.URL
            vc.webConfig = configuration
            wv = vc.view as? WKWebView

            self.navigationController?.pushViewController(vc, animated: true)
        }
    }

    return wv
}

Answer 11

我遇到了一些使用webView.load(navigationAction.request)无法解决的问题。所以我使用创建一个新的webView来做它只是工作正常。

//MARK:- WKUIDelegate
func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
    NSLog(#function)

    if navigationAction.targetFrame == nil {
        NSLog("=> Create a new webView")

        let webView = WKWebView(frame: self.view.bounds, configuration: configuration)
        webView.uiDelegate = self
        webView.navigationDelegate = self

        self.webView = webView

        return webView
    }
    return nil
}