如何从 Javascript 调用 Objective-C？

我有一个 WebView，我想从 JavaScript 调用 Objective-C 中的视图。有人知道我该怎么做吗？

我的 ViewController 中有这段代码：

- (BOOL)webView:(UIWebView *)webView2 
 shouldStartLoadWithRequest:(NSURLRequest *)request 
 navigationType:(UIWebViewNavigationType)navigationType {

 NSString *requestString = [[request URL] absoluteString];
 NSArray *components = [requestString componentsSeparatedByString:@":"];

 if ([components count] > 1 && 
  [(NSString *)[components objectAtIndex:0] isEqualToString:@"myapp"]) {
  if([(NSString *)[components objectAtIndex:1] isEqualToString:@"myfunction"]) 
  {

   NSLog([components objectAtIndex:2]); [[Airship shared] displayStoreFront]; //<- This is the code to open the Store
   NSLog([components objectAtIndex:3]); // param2
   // Call your method in Objective-C method using the above...
  }
  return NO;
 }

 return YES; // Return YES to make sure regular navigation works as expected.
}

在 JavaScript 中：

function store(event)
{
    document.location = "myapp:" + "myfunction:" + param1 + ":" + param2;
}

但什么也没发生。

标准解决方法为UIWebView就是设置一个UIWebViewDelegate，并实现该方法webView:shouldStartLoadWithRequest:navigationType: http://developer.apple.com/iphone/library/documentation/uikit/reference/UIWebViewDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/UIWebViewDelegate/webView:shouldStartLoadWithRequest:navigationType:。在您的 JavaScript 代码中，导航到某个虚假 URL，该 URL 对您要传递给应用程序的信息进行编码，例如：

window.location = "fake://myApp/something_happened:param1:param2:param3";

在您的委托方法中，查找这些假 URL，提取您需要的信息，采取任何适当的操作，然后返回NO取消导航。如果您使用以下命令推迟任何冗长的处理，这可能是最好的一些味道performSelector http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSObject_Class/Reference/Reference.html#//apple_ref/doc/uid/20000050-SW20.