Communication between iOS's native app and webpage's javascript

Question

I have a webpage loaded in a UIWebView, and a javascript function of the page needs to data from native iOs app, a NSString. How can a Js function access the data in native app

Answer 1

You can execute JavaScript in your UIWebView from Obj-C. Simply call [webView stringByEvaluatingJavaScriptFromString:@"myJavaScript"];.

I could imagine a setup like this:

Webpage

Objective-C

NSString *myParameter = @"myParameter";
[webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"callmeFromObjC('%@')", myParameter]];