Best practice to send a lot of data in background on iOS4 device?

Question

I have an app that needs to send data (using POST) to a server. This function has to be on one of the NavigationController sub-controllers and user should be able to navigat

Answer 1

I'd just use NSURLConnection. It's a bit tricky if you want to send multipart/form-data (see the SimpleURLConnections/PostController.m example). I'd stick it in the app delegate, but I'm lazy like that.

You shouldn't worry about threads at all unless non-blocking I/O (i.e. NSURLConnection) is too slow. Threading has its own overheads, and inter-thread communication is a pain, and deadlocks are terrible.

What you do need to do is start a background task to allow your app to continue executing while backgrounded (end the background task in connectionDidFinishLoading: and connection:didFailWithError). Backgrounded apps are given about 10 minutes to finish executing background tasks.