Question

Lets say i have an client application on iOS which is connected to a server using a C socket.
I receive and send data on this socket.

Now the user closes the App, so something else (let’s say check his mail) and returns to the application.

My (bundle of) question(s):
What to do with the socket connection?
Should you close it and try to reopen the socket when relaunching the application?
Or can i leave the socket open? If so, what happens with the data which is received on the connection?

Other situations to consider are:

• I do not know when the user returns to the application.
• I do not know if the user stays in the same network.

Thanks

Answer 1

The connection should be closed and the received data saved [if necessary], when the application is about to ‘resign active’.

The connection would not be able to run in the background. And you will not receive any data in the background.

When the application resumes from the background reopen the connection and continue.

These methods will help you keep track of your application’s state

– applicationWillResignActive:
– applicationDidEnterBackground:
– applicationWillEnterForeground: