Question: Does this only work if at least one of the apps (e.g., myapp2) is installed via the app store? I cannot understand how one custom app would be able to know about another custom app. It doesn’t seem like creating a custom url scheme goes the distance.

Has anyone tried custom app to custom app use of the custom url schemes approach? Thanks,

Jack

Create a class that implements the IWebViewDelegate protocol and implement the shouldStartLoadWithRequest method. When your webview needs to load a page (via a clicked link, an ajax request, some sort of javascript event, whatever…) it will call this method on your delegate and pass in an NSUrlRequest object.

if [[request url] scheme] is your app’s custom scheme, go ahead and do whatever it is the url indicates you should do, and return NO to prevent the webview from continuing to process the request. If the scheme isn’t something you want to catch, return YES to let the webview handle the request in the usual manner.

PhoneGap does this (see /iphone/PhoneGapLib/Classes/PhoneGapDelegate.m) in a very elegant way, providing a way for their javascript framework to call methods written in obj-c. They use the stringByEvaluatingJavaScriptFromString method of the webview to pass information back into the browser from obj-c, which is also pretty slick.