A lot of folks commented today on newly-approved web browsers appearing in the App Store. Or, more precisely, a handful of apps using the existing web browser widget to offer a slightly tweaked browser experience.
While iPhone apps could include the UIWebView component before -- and indeed this has proven a popular route to getting hybrid native/web apps up and running quickly -- today's change is about allowing apps that "duplicate" a built-in feature of the phone. And one of the fundamental characteristics of any web browser nowadays is that it is thoroughly scriptable.
If you build an app this way, it already includes a scripting environment ... so the question (since scripting and dynamic apps are verboten on un-jailbroken iPhones) is how far one can let the scripting go and still pass muster with the App Store overlords.
Using stringByEvaluatingJavaScriptFromString we can inject script into the browser ... including script that pulls data back out.
And although the JavaScript bridge is "one directional" compared to the OSX desktop API, there are workarounds such as registering a protocol handler to receive scripted "requests" from inside the page ... or by hooking decidePolicyForNavigationAction with a script-initiated navigation request (disclaimer: I haven't checked to see if this is in the phone API, but it seems plausible) to signal the availability of data.
So native code becomes effectively scriptable. Or, for an even less controversial but perhaps equally powerful route: just inject a bunch of JavaScript API libraries into the browser and keep the scripting (and more of your app) in Safari. That's not too different from pointing a browser at a web site (where the page loads various scripting libraries) ... except that underneath it all we are in native-caps mode ...
Unless I'm missing something here, a somewhat ambiguous situation has gotten thornier with the admission of this new class of general purpose browser apps.
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