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Objective-C / Cocoa windowScriptObject命令無法從加載的頁面中運行

[英]Objective-C/Cocoa windowScriptObject commands not working from loaded page

我試圖讓'windowScriptObject'工作,這是我的Objective-C代碼如下:

- (void)consoleLog:(NSString *)aMessage {
    NSLog(@"JSLog: %@", aMessage); }

+ (BOOL)isSelectorExcludedFromWebScript:(SEL)aSelector {
    if (aSelector == @selector(consoleLog:)) {
        return NO;
    }

    return YES; }

- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame {

    NSLog(@"Did finnish load...");
    scriptObject = [sender windowScriptObject];

    //obviously, this returns undefined
    NSLog(@"Object: %@",[scriptObject evaluateWebScript:@"MyApp"]);

    //set the value of MyApp
    [scriptObject setValue:self forKey:@"MyApp"];

    //this now returns the value
    NSLog(@"Object: %@",[scriptObject evaluateWebScript:@"MyApp"]);




    //this command now works from here
    [scriptObject evaluateWebScript:@"MyApp.consoleLog_('Test');"]; 
}

注入JavaScript時,上面的代碼有效( evaluateWebScript

這是控制台輸出的內容:

2012-12-06 08:03:05.605 BetterDesktop[8669:303] Did finnish load...
2012-12-06 08:03:05.605 BetterDesktop[8669:303] Object: undefined
2012-12-06 08:03:05.606 BetterDesktop[8669:303] Object: <WidgetsDelegate: 0x10133de60>
2012-12-06 08:03:05.607 BetterDesktop[8669:303] JSLog: Test

該命令有效,但是當我使用頁面時它不起作用。

<html>
<head>
<script type="text/javascript">
if (typeof(MyApp) != "undefined"){
document.write('<br/><h1>hi</h1>');
MyApp.consoleLog_('Test from HTML');
}
else{

document.write('<br/><h1>Not Defined</h1>');
}

</script>
</head>
<body>
</body>
</html>

它認為“MyApp”未定義,有什么建議嗎?

(順便說一句,WebView沒有連接到這個類,它只是委托)

您應該從-webView:didClearWindowObject:forFrame: WebFrameLoadDelegate方法而不是-webView:didFinishLoadForFrame:對象注入WebView。 在調用didClearWindowObject之前,不保證window對象已正確初始化。

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