iOS PhoneGap ChildBrowser “data argument not used by format string” warnings with XCode 4.4

Question

I've updated XCode to v4.4 and started getting warnings in the PhoneGap (Cordova 1.9.0) ChildBrowser plug-in that never showed up with v4.3. (Nothing else in my code changed.) When I saw these warnings, I pulled the latest version of the ChildBrowser plugin and that didn't make the warnings go away, either.

Anyway... in ChildBrowserCommand.m:

-(void) onClose
{
    NSString* jsCallback = [NSString stringWithFormat:@"window.plugins.childBrowser.onClose();",@""];
    [self.webView stringByEvaluatingJavaScriptFromString:jsCallback];
}

-(void) onOpenInSafari
{
    NSString* jsCallback = [NSString stringWithFormat:@"window.plugins.childBrowser.onOpenExternal();",@""];
    [self.webView stringByEvaluatingJavaScriptFromString:jsCallback];
}

Each of these give a "Data argument not used by format string" warning. This makes sense since there's no place for the @"" to be placed into the format string even if it had a value.

I'm no Objective-C expert but realize I can get rid of the warning by deleting the ,@"" in the call.

Just posting in case anyone can explain why this started showing up after updating to XCode 4.4 and whether/how this should be flagged as an issue with the iOS PhoneGap ChildBrowser plugin on GitHub.

Answer 1

I had the same problem and i have to admit I did not notice your answer so: I have no idea why this fix it and will be happy to know but this is the fix. To fix this use the following code:

-(void) onClose
{
    NSString* jsCallback = [NSString stringWithFormat:@"window.plugins.childBrowser.onClose();"];
    [self.webView stringByEvaluatingJavaScriptFromString:jsCallback];
}

-(void) onOpenInSafari
{
    NSString* jsCallback = [NSString stringWithFormat:@"window.plugins.childBrowser.onOpenExternal();"];
    [self.webView stringByEvaluatingJavaScriptFromString:jsCallback];
}