iOS objective-c How can I catch window.open event in UIWebView

Question

I'm developing iOS hybrid app coded by Objective-C. I want to catch 'window.open' events in UIWebView. I found this code.

    -(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
    {
        if (navigationType == UIWebViewNavigationTypeLinkClicked ){       
           NSLog(@"opening link");
              return NO;
         }
    ....
    ...
        return YES;
    }

    - (void)webViewDidFinishLoad:(UIWebView *)webView {
        NSString * test =  [webView stringByEvaluatingJavaScriptFromString:@"window.open = function (open) { return function  (url, name, features) { window.location.href = url; return window; }; } (window.open);"];
        //
            NSLog(@"test:%@", test);   << always print blank
    ....
    ...
    ..
    }



info.plist
<key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>

But it catches not only 'window.open' but other link events. Some answers suggest to use 'stringByEvaluatingJavaScriptFromString', but I didn't understand.

Could you explain it for beginners to understand easily? I just want to catch 'window.open' event in UIWebView.

Answer 1

You need to use following code to detect window opening:

[webView stringByEvaluatingJavaScriptFromString:@"window.open = function (open) { return function  (url, name, features) { window.location.href = url; return window; }; } (window.open);"];

Try to put above code below delegate method:

- (void)webViewDidFinishLoad:(UIWebView *)webView {}