I realize I can determine what type of connection the app has access to within iOS (I have WiFi access; I have Cellular access). However, if I have access to both can I inform a NSURLConnection or UIWebView to use one or the other?
Ideally, a few specific calls I make with NSURLConnection would use cellular network, and a few calls and webview loads would use WiFi.
I don't believe this is possible, but I would like to know concretely.
This isn't something you can specify. It's entirely down to the OS as to which connection to use (cellular vs WiFi) and it will choose the best available based on a number of things like connection strength, WiFi assist etc.