iOS Access objc variable from javascript?

[Danneman101]

How can I access an objc variable (say an integer) from the javascript-code of a html-page within a uiwebview?

Is it even possible?

 

[jnic]

I've had limited success doing something similar by modifying the DOM using stringByEvaluatingJavaScriptFromString:, but it's basically trial and error.

 

[Danneman101]

There is very little documentation on it, and no examples to mimic/alter.

Was your solution to call the javascript and pass along the variabel as a parameter?

Pseudocode:

- (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)myJSFunction(returnParameter)

 

[jnic]

Was your solution to call the javascript and pass along the variabel as a parameter?

Yup.

[webview stringByEvaluatingJavaScriptFromString:
	[NSString stringWithFormat:@"document.write(\"%d\");", var]];

etc.

 

[Danneman101]

Alright, Im getting somewhere - thanks for your help

Finally, just let me get this straight: in the code you substitute the %d with var?

 

[jnic]

That's right. In this case, "var" is an integer. See stringWithFormat and String Format Specifiers for more.

 

[Danneman101]

Great - thanks again for the help Much appreciated!