Mengapa WKWebView tidak membuka tautan dengan target = “_ blank”?

WKWebViewtidak membuka tautan apa pun yang memiliki target="_blank"atribut alias 'Buka di Jendela baru' di HTML <a href>-Tag mereka.

Solusi saya adalah membatalkan navigasi dan memuat permintaan dengan loadRequest: lagi. Ini akan menjadi perilaku serupa seperti UIWebView yang selalu membuka jendela baru di bingkai saat ini.

Terapkan WKUIDelegatedelegasi dan setel ke _webview.uiDelegate. Kemudian terapkan:

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

  return nil;
}

Jawaban dari @Cloud Xu adalah jawaban yang benar. Hanya untuk referensi, ini dia di 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
}

Untuk menggunakan versi terbaru Swift 4.2+

import WebKit

Perluas kelas Anda dengan WKUIDelegate

Tetapkan delegasi untuk tampilan web

self.webView.uiDelegate = self

Menerapkan metode protokol

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

Tambahkan diri Anda sebagai WKNavigationDelegate

_webView.navigationDelegate = self;

dan implementasikan kode berikut dalam delegasi callback decisionPolicyForNavigationAction: decisionHandler:

- (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);
}

PS: Kode ini berasal dari proyek kecil saya STKWebKitViewController, yang membungkus UI yang dapat digunakan di sekitar WKWebView.

Jika Anda sudah menyetel WKWebView.navigationDelegate

WKWebView.navigationDelegate = diri;

Anda hanya perlu menerapkan:

- (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);
}

dengan cara ini Anda tidak perlu mengimplementasikan metode WKUIDelegate.

Tak satu pun dari solusi itu berhasil untuk saya, saya menyelesaikan masalah dengan:

1) Pelaksana WKUIDelegate

@interface ViewController () <WKNavigationDelegate, WKUIDelegate>

2) Mengatur delegasi UIDelegate dari wkWebview

self.wkWebview.UIDelegate = self;

3) Menerapkan metode createWebViewWithConfiguration

- (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;  }

Cloud xuJawabannya memecahkan masalah saya.

Jika seseorang membutuhkan versi Swift (4.x / 5.0) yang setara, ini dia:

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
}

Tentu Anda harus mengaturnya webView.uiDelegateterlebih dahulu.

Saya mengonfirmasi bahwa kode Swift Bill Weinman sudah benar. Tetapi perlu disebutkan bahwa Anda juga perlu mendelegasikan UIDelegate agar berfungsi, jika Anda baru mengenal iOS berkembang seperti saya.

Sesuatu seperti ini:

self.webView?.UIDelegate = self

Jadi ada tiga tempat yang Anda perlukan untuk melakukan perubahan.

Anda juga dapat mendorong pengontrol tampilan lain, atau membuka tab baru, dll:

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
}

Berdasarkan jawaban allen huang

Detail

• Xcode Versi 10.3 (10G8), Swift 5

Target

• mendeteksi tautan dengan target=“_blank”
• push lihat pengontrol dengan webView jika pengontrol saat ini memilikinya navigationController
• present lihat pengontrol dengan webView dalam semua kasus lainnya

Larutan

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
    }
}

Sampel lengkap

Info.plist

tambahkan pengaturan keamanan transportasi Info.plist Anda

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

ViewController

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)
    }
}

Papan cerita

Versi 1

Versi 2

Ini berhasil untuk saya:

-(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;
}

Seperti yang Anda lihat, apa yang kami lakukan di sini hanyalah membuka yang baru webViewdengan url baru dan mengontrol kemungkinan ditutup, hanya jika Anda memerlukan respons dari itu second webviewuntuk ditampilkan terlebih dahulu.

Saya mengalami beberapa masalah yang tidak dapat diselesaikan hanya dengan menggunakan webView.load(navigationAction.request). Jadi saya menggunakan create a new webView untuk dilakukan dan itu berfungsi dengan baik.

//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
}

**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)) }
}