Question

我有一个呈现javascript的UIWebView。每当UIWebView中呈现的javascript关闭时，我想杀死这个UIWebView。

实质上，我想让UIWebView仅用于加载javascript！

Answer 1

为了执行javascript，您不需要在当前视图上添加uiwebview。你可以在屏幕上显示你的uiwebview来执行你想要的观察者。

通知您的uiwebview关闭自己使用javascript。首先，您必须将您的课程设置为您的uiwebview的代表：

NSURL *url = [NSURL URLWithString:@"https://myWebWithJavascript.html"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; 
//if your are not to display webview, frame dimensions does not mind
UIWebView uiwebview = [[UIWebView alloc] initWithFrame:CGRectMake(0,0,320, 480)];
[uiwebview setDelegate:self];  //remember that your .h has to implement <UIWebViewDelegate> 
[uiwebview loadRequest:request];

//then you implement notifications:
//this is executed when uiwebview has been loaded
- (void)webViewDidFinishLoad:(UIWebView *)webView
{ 
   //put here code if you wanna do something with uiwebview once has finished loading 
}
//this one is executed if your request returns any error on loading page
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
//put here code if you wanna manage html errors
}
//this one it the ONE you will use to receive messages from javascript code:
//this function is executed every time an http request is made
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest: (NSURLRequest*)req navigationType:(UIWebViewNavigationType)navigationType { 
        //we check every time there is an http request if the request contains
        //an special prefix that indicates it is not a real http request, but 
        //a comunication from javascript code 
        if ([[[req URL] absoluteString] hasPrefix:@"my-special-frame"]) {
             //so thats it- javascript code is indicating me to do something
             //for example: closing uiwebview:
             [webview release];  //probably it would be cleverer not to kill this way your uiwebview...but it is just an example
             return NO; //that is important because avoid uiwebview to load this fake http request 
        }   
 return YES; //that means that it will load http request that skips the if clause   
}

然后在您的javascript中，您只需要使用我们期望的Objective-c代码的特殊前缀发出http请求：

   var iframe = document.createElement("IFRAME");
   iframe.setAttribute("src", "my-special-frame:uzObjectiveCFunction");
   document.documentElement.appendChild(iframe);

在这个例子中，我打开一个带有包含我们特殊前缀的URL的框架。你也可以做一个简单的事情：

   document.location.href = my-special-frame:uzObjectiveCFunction;

希望这有助于你的疑惑！祝好运！

关闭UIWebView，当javascript发出“window.close”时

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