Objective-C - 在webview中打開webview

Question

我是Objective-C的新手，因爲我來自android背景。我在android中實現了一個功能，現在需要在IOS中實現。

我有一個webview，它打開了一個網頁。用戶點擊那裏的facebook登錄按鈕，在web瀏覽器中彈出一個新的webchromeclient。一旦登錄，我用原來的webview取代webview並捕獲cookie。頁面自動確定用戶的登錄狀態並打開用戶的個人資料頁面。

這裏是我的活動佈局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:background="#0099cc" 
     tools:context=".MyActivity" 
     android:id="@+id/webview_frame"> 
     <WebView xmlns:android="http://schemas.android.com/apk/res/android" 
      android:id="@+id/webview" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      /> 
    </FrameLayout> 
</LinearLayout> 

這是MyActivity：

public class MyActivity extends Activity { 

    private static final String target_url="https://www.mywebpage.com/login"; 
    private static final String target_url_prefix="www.mywebpage.com"; 
    private static final String target_url_profile= "http://www.mywebpage.com/profile" ; 

    private WebView mWebview; //To Hold original page 
    private WebView mWebviewPop; //To hold facebook login popup 
    private FrameLayout mContainer; //Framecontainer to replace webviews 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.myactivity); 

     mWebview = (WebView) findViewById(R.id.webview); 
     mContainer = (FrameLayout) findViewById(R.id.webview_frame); 

     //To check login status and other stuffs 
     CookieManager cookieManager = CookieManager.getInstance(); 
     cookieManager.setAcceptCookie(true); 

     WebSettings webSettings = mWebview.getSettings(); 
     webSettings.setJavaScriptEnabled(true); 
     webSettings.setAppCacheEnabled(true); 
     webSettings.setJavaScriptCanOpenWindowsAutomatically(true); 
     webSettings.setSupportMultipleWindows(true); 
     mWebview.setWebViewClient(new UriWebViewClient()); 
     mWebview.setWebChromeClient(new UriChromeClient()); 
     mWebview.loadUrl(target_url); 
    } 

    // 
    private class UriWebViewClient extends WebViewClient { 
     @Override 
     public boolean shouldOverrideUrlLoading(WebView view, String url) { 
      String host = Uri.parse(url).getHost(); 

      //If host is actually my webpage, remove popup and dont override 
      if (host.equals(target_url_prefix)) 
      { 
       if(mWebviewPop!=null) 
       { 
        mWebviewPop.setVisibility(View.GONE); 
        mContainer.removeView(mWebviewPop); 
        mWebviewPop=null; 
       } 
       return false; 
      } 

      //If this is a facebook login popup, dont override 
      if(host.equals("m.facebook.com")) 
      { 
       return false; 
      } 

      Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
      startActivity(intent); 
      return true; 
     } 



     @Override 
     public void onPageStarted(WebView view, String url, Bitmap favicon) { 
      super.onPageStarted(view, url, favicon); 
      String cookies = CookieManager.getInstance().getCookie(url); //Just reading cookies here 
      if(cookies != null && !cookies.isEmpty()) { 
       //Further logics with cookies 
      } 
     } 

     @Override 
     public void onPageFinished(WebView view, String url) { 
      super.onPageFinished(view, url); 
      String cookies = CookieManager.getInstance().getCookie(url); 
      if(cookies != null && !cookies.isEmpty()) { 
       if (isUserloggedinFacebook(cookies)) { //Check user login status from cookies 
        if (mWebviewPop != null) { 
         mWebviewPop.setVisibility(View.GONE); 
         mContainer.removeView(mWebviewPop); 
         mWebviewPop = null; 
        } 
        mWebview.loadUrl(target_url_profile); //User is loggedin, load profile page 
       } 
      } 
     } 
    } 

    class UriChromeClient extends WebChromeClient { 

     @Override 
     public boolean onCreateWindow(WebView view, boolean isDialog, 
             boolean isUserGesture, Message resultMsg) { 
      mWebviewPop = new WebView(mContext); 
      mWebviewPop.setVerticalScrollBarEnabled(false); 
      mWebviewPop.setHorizontalScrollBarEnabled(false); 
      mWebviewPop.setWebViewClient(new UriWebViewClient()); 
      mWebviewPop.getSettings().setJavaScriptEnabled(true); 
      mWebviewPop.getSettings().setSavePassword(false); 
      mWebviewPop.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 
        ViewGroup.LayoutParams.MATCH_PARENT)); 
      mContainer.addView(mWebviewPop); 
      WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj; 
      transport.setWebView(mWebviewPop); 
      resultMsg.sendToTarget(); 
      return true; 
     } 

     @Override 
     public void onCloseWindow(WebView window) { 
      Log.d("onCloseWindow", "called"); 
     } 
    } 

} 

此代碼是需要Objective-C的寫入，但我不知道如何重寫URL並取代webview。我嘗試創建兩個獨立的網頁瀏覽，但是在登錄Facebook後，我無法返回到原始webview並閱讀cookie。

有人可以幫忙嗎？

Answer 1

- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType { 
    //CAPTURE USER LINK-CLICK. 
     NSURL *url = [request URL]; 
     yourTextBox.text = [url absoluteString]; 


     return YES; 
} 

上面的代碼是等同於Android的shouldOverrideURL你可以按照這個thread獲取更多信息。