关于ios：为什么WKWebView不打开带有target =“ _ blank”的链接？


Why is WKWebView not opening links with target=“_blank”?

WKWebView不会打开在其HTML -Tag中具有target="_blank" a.k.a."在新窗口中打开"属性的链接。

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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，该行为始终在当前框架中打开新窗口。

实现WKUIDelegate委托并将其设置为_webview.uiDelegate。然后执行：

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- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures
{
  if (!navigationAction.targetFrame.isMainFrame) {
    [webView loadRequest:navigationAction.request];
  }

  return nil;
}
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@Cloud Xu的答案是正确的答案。仅供参考，在Swift中：

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// 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
}
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使用最新版本的Swift 4.2+

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import WebKit

使用WKUIDelegate扩展课程

为webview设置委托

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self.webView.uiDelegate = self

实施协议方法

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

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_webView.navigationDelegate = self;

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

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- (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);
}

附注：此代码来自我的小项目STKWebKitViewController，该项目将可用的UI围绕WKWebView封装。

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如果您已经设置了WKWebView.navigationDelegate

WKWebView.navigationDelegate =自我;

您只需要实现：

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- (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，您无需实现WKUIDelegate方法。

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Cloud xu的答案解决了我的问题。

如果有人需要等效的Swift(4.x / 5.0)版本，则为：

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func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
    if let frame = navigationAction.targetFrame,
        frame.isMainFrame {
        return nil
    }
    // for _blank target or non-mainFrame target
    webView.load(navigationAction.request)
    return nil
}

当然，您必须首先设置webView.uiDelegate。

这些解决方案都不适合我，我确实通过以下方式解决了该问题：

1)实施WKUIDelegate

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@interface ViewController () <WKNavigationDelegate, WKUIDelegate>

2)设置wkWebview的UIDelegate委托

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self.wkWebview.UIDelegate = self;

3)实现createWebViewWithConfiguration方法

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- (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;  }
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我确认Bill Weinman的Swift代码正确。但是需要指出的是，如果您像我一样不熟悉iOS，则还需要委派UIDelegate使其起作用。

像这样：

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self.webView?.UIDelegate = self

因此，您需要在三个地方进行更改。

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您还可以推送另一个视图控制器，或打开一个新标签，等等：

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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
}
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基于艾伦·黄的回答

细节

  • Xcode版本10.3(10G8)，Swift 5

目标

  • 检测与target="_blank"的链接
  • 如果当前控制器具有navigationController，则带有WebView的push视图控制器
  • 在所有其他情况下，带有WebView的present视图控制器

解

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webView.uiDelegate = self

// .....

extension ViewController: WKUIDelegate {
    func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
        guard   navigationAction.targetFrame == nil,
                let url =  navigationAction.request.url else { return nil }
        let vc = ViewController(url: url, configuration: configuration)
        if let navigationController = navigationController {
            navigationController.pushViewController(vc, animated: false)
            return vc.webView
        }
        present(vc, animated: true, completion: nil)
        return nil
    }
}

完整样本

Info.plist

添加您的Info.plist传输安全设置

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<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

ViewController

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import UIKit
import WebKit

class ViewController: UIViewController {

    private lazy var url = URL(string:"https://www.w3schools.com/html/tryit.asp?filename=tryhtml_links_target")!
    private weak var webView: WKWebView!

    init (url: URL, configuration: WKWebViewConfiguration) {
        super.init(nibName: nil, bundle: nil)
        self.url = url
        navigationItem.title =""
    }

    required init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) }

    override func viewDidLoad() {
        super.viewDidLoad()
        initWebView()
        webView.loadPage(address: url)
    }

    private func initWebView() {
        let webView = WKWebView(frame: .zero, configuration: WKWebViewConfiguration())
        view.addSubview(webView)
        self.webView = webView
        webView.navigationDelegate = self
        webView.uiDelegate = self
        webView.translatesAutoresizingMaskIntoConstraints = false
        webView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        webView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor).isActive = true
        webView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
        webView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor).isActive = true
    }
}

extension ViewController: WKNavigationDelegate {
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        guard let host = webView.url?.host else { return }
        navigationItem.title = host
    }
}

extension ViewController: WKUIDelegate {
    func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
        guard   navigationAction.targetFrame == nil,
                let url =  navigationAction.request.url else { return nil }
        let vc = ViewController(url: url, configuration: configuration)
        if let navigationController = navigationController {
            navigationController.pushViewController(vc, animated: false)
            return vc.webView
        }
        present(vc, animated: true, completion: nil)
        return nil
    }
}

extension WKWebView {
    func loadPage(address url: URL) { load(URLRequest(url: url)) }
    func loadPage(address urlString: String) {
        guard let url = URL(string: urlString) else { return }
        loadPage(address: url)
    }
}

故事板

版本1

enter image description here

版本2

enter image description here

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这对我有用：

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-(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;
}

如您所见，我们要做的只是使用新的URL打开一个新的webView并控制关闭的可能性，即使您需要从该second webview的响应中首先显示该响应。

我遇到了一些仅使用webView.load(navigationAction.request)无法解决的问题。因此，我使用创建一个新的webView来完成它，并且工作正常。

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//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
}
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**Use following function to create web view**

func initWebView(configuration: WKWebViewConfiguration)
{
        let webView = WKWebView(frame: UIScreen.main.bounds, configuration: configuration)
        webView.uiDelegate = self
        webView.navigationDelegate = self
        view.addSubview(webView)
        self.webView = webView
    }

**In View Did Load:**

 if webView == nil { initWebView(configuration: WKWebViewConfiguration()) }
   webView?.load(url: url1)


**WKUIDelegate Method need to be implemented**

extension WebViewController: WKUIDelegate {

    func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
        // push new screen to the navigation controller when need to open url in another"tab"
        print("url:\\(String(describing: navigationAction.request.url?.absoluteString))")
        if let url = navigationAction.request.url, navigationAction.targetFrame == nil {
            let viewController = WebViewController()
            viewController.initWebView(configuration: configuration)
            viewController.url1 = url
            DispatchQueue.main.async { [weak self] in
                self?.navigationController?.pushViewController(viewController, animated: true)
            }
            return viewController.webView
        }

        return nil
    }
}

extension WKWebView

{
    func load(url: URL) { load(URLRequest(url: url)) }
}