GameCenter login alert

Question

In a game I am developing using GameCenter, I want to handle the following scenario:

1. the user starts up the game. He is shown the system alert that prompts him to

Answer 1

I'm facing the same issue. Though I couldn't find a way to enforce poping up the same dialog for logging into Game Center, I did find a way to implement a warning message saying 'gamecenter is disabled' when user clicks on a leaderboard icon:

if([GKLocalPlayer localPlayer].authenticated == NO)
{
// Prompt a warning message alert saying game center is disabled
}
else
{
// Proceed with opening leaderboard
}

Hope this helps!