Objective c 如何在IOS中集成Javascript_Objective C_Uiwebview_Xcode7_Javascriptcore

Objective c 如何在IOS中集成Javascript

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Objective c 如何在IOS中集成Javascript,objective-c,uiwebview,xcode7,javascriptcore,Objective C,Uiwebview,Xcode7,Javascriptcore,如何在objective c中集成JavaScript？下面是我的JavaScript代码： <!DOCTYPE HTML> <head> <meta name="viewport" content="initial-scale=1.0, user-scalable=no" /> <script type="text/javascript" src="https://maps.micello.com/webmap/v0/mi

如何在objective c中集成JavaScript？
下面是我的JavaScript代码：

<!DOCTYPE HTML>
<head>
    <meta  name="viewport"  content="initial-scale=1.0,  user-scalable=no"  />
    <script  type="text/javascript"  src="https://maps.micello.com/webmap/v0/micellomap.js"></script>
    <script  type="text/javascript">
        micello.maps.init("ZccEicxOED0xicnQFrnkK7uzXJJUog",mapInit);
        function  mapInit(strMapID)  {
            alert("Hello World!"+strMapID);
            var  mapControl = new micello.maps.MapControl('mapElement');
            var  mapDataObject = mapControl.getMapData();
            mapDataObject.loadCommunity(strMapID);
        }
    </script>
    <style  type="text/css">
        html, body { height: 100%; width: 100%; margin: 0; overflow: hidden; }
        #mapElement{ width:100%;  height:100%; }
        </style>
</head>
<body>
    <div  id="mapElement"></div>
</body>
</html>

WebView委托方法：

-(void)webViewDidStartLoad:(UIWebView *)webView {
    NSLog(@"start");
}
-(void)webViewDidFinishLoad:(UIWebView *)webView1 {
    NSLog(@"finish");

    [webView1 stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"mapInit(%@)",strMapID]];

    //[webView stringByEvaluatingJavaScriptFromString:@"mapInit()"];
}
-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
    NSLog(@"Error for WEBVIEW: %@", [error description]);
}

但是在这里，JavaScript

alert（“helloworld！”+strMapID）正在调用两次。第一次显示正确的MapID，但第二次显示未定义的MapID。

我不知道为什么alert打了两次电话。正因为如此，我的网络视图中出现了500个错误

请引导我解决我的问题
提前谢谢
 首先我们需要在我调用的委托方法中设置UIWebView，然后设置UIWebViewstringByEvaluatingJavaScriptFromString
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
  CGFloat height = [[webview stringByEvaluatingJavaScriptFromString:@"document.height"] floatValue];
  CGRect frame = webview.frame;
  frame.size.height = height;
  webview.frame = frame;
  //If you want to set font size and body of HTML
  int fontSize = 80;
  NSString *jsString = [[NSString alloc] initWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%d%%'", fontSize];
  [webview stringByEvaluatingJavaScriptFromString:jsString];
  NSString *jsWebViewFontFamilyString = [[NSString alloc] initWithFormat:@"document.getElementsByTagName('body')[0].style.fontFamily = 'Helvetica'"];
  [webview stringByEvaluatingJavaScriptFromString:jsWebViewFontFamilyString];

  //For passing parameter from Objective c to JavaScript
  NSString *strMapId  = @"1367"; //Your ID
  NSString *jsCallBack = [NSString stringWithFormat:@"mapInit('%@')",strMapId];
  [webView stringByEvaluatingJavaScriptFromString:jsCallBack];
}


然后如果你想导航或做任何事情
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
  switch (navigationType)
  {
    case UIWebViewNavigationTypeLinkClicked:
        //When User tapped a link. 
        break;
    case UIWebViewNavigationTypeOther: 
       //Some other action occurred. 
       break;
    case UIWebViewNavigationTypeFormSubmitted:
        //user submitted a form. 
       break;
    case UIWebViewNavigationTypeBackForward: 
       //User tapped the back or forward button. . 
       break;
    case UIWebViewNavigationTypeReload:
       //User tapped the reload button. 
      break;
     case UIWebViewNavigationTypeFormResubmitted
       //User resubmitted a form. . 
      break;
   }
 return YES; 
}

这有帮助吗：？这不是我的专业领域。谢谢@0aslam0，但是这个链接对我没有帮助。我想知道如何将这个html代码转换成javascript函数。在本例中，我希望通过目标c传递mapInit（n）方法中的参数。很抱歉@user3182143，但我希望在一个js文件中实现我的JavaScript代码，并希望在目标c中传递参数mapInit（n）方法。你明白我的问题吗？不明白。你能告诉我如何在我的场景中使用这个链接答案吗？N意味着什么？你为什么要通过N？我的答案和你的webview DidFininsLoad答案是正确的。我想你可能在java脚本代码中弄错了
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
  switch (navigationType)
  {
    case UIWebViewNavigationTypeLinkClicked:
        //When User tapped a link. 
        break;
    case UIWebViewNavigationTypeOther: 
       //Some other action occurred. 
       break;
    case UIWebViewNavigationTypeFormSubmitted:
        //user submitted a form. 
       break;
    case UIWebViewNavigationTypeBackForward: 
       //User tapped the back or forward button. . 
       break;
    case UIWebViewNavigationTypeReload:
       //User tapped the reload button. 
      break;
     case UIWebViewNavigationTypeFormResubmitted
       //User resubmitted a form. . 
      break;
   }
 return YES; 
}