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[英]How to call an Objective-C method from Javascript in a Cocoa/WebKit app?
[英]Objective-C/Cocoa windowScriptObject commands not working from loaded page
我试图让'windowScriptObject'工作,这是我的Objective-C代码如下:
- (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时,上面的代码有效( evaluateWebScript )
这是控制台输出的内容:
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
该命令有效,但是当我使用页面时它不起作用。
<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>
它认为“MyApp”未定义,有什么建议吗?
(顺便说一句,WebView没有连接到这个类,它只是委托)
您应该从-webView:didClearWindowObject:forFrame:
WebFrameLoadDelegate
方法而不是-webView:didFinishLoadForFrame:
对象注入WebView。 在调用didClearWindowObject
之前,不保证window
对象已正确初始化。
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