objective c - UIWebView isn't displayed until moved by touches -

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i have 3 webviews in uiview , 1 showed. when loading urls not-displayed webviews, , move them frame center show white box - white screen, if keep saying finished loading. so... there possibiliy force them redraw after loading? when scroll them in random direction webviews encouraged show content... other ideas fix bug?

code: 

- (bool)webview:(uiwebview *)webview shouldstartloadwithrequest:(nsurlrequest *)request navigationtype:(uiwebviewnavigationtype)navigationtype {  return yes; } - (void)webviewdidfinishload:(uiwebview *)webview {      boolean end = true;     (int = 0 ; < 3 ; ++)     {         if ( mainwebviews[i].isloading )          {             end = false;         }      }     if (end)     {         //nslog(@"nothing loading?");          [loader stopanimating];         loader.hidden = yes;      }      webview.hidden = no;      // how redraw here?  }  - (void)webviewdidstartload:(uiwebview *)webview {        //nslog(@"start loading");     webview.hidden = yes;      loader.hidden = no;     [loader startanimating];  }  -(void)webview:(uiwebview*) wv didfailloadwitherror: (nserror*) error {     // stupid -999 error     if ( [error code] != nsurlerrorcancelled )     {         nslog(@"error");         nslog( [error localizeddescription ]);     }   }  -(void)loadtowebview:(uiwebview*)wv string:(nsstring*)url {     if (wv == nil)         return;       [wv loadrequest:[nsurlrequest requestwithurl:[nsurl urlwithstring:url]]];    }


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