How to find is this first time player registering / playing game?

Question

How to find is this first time player registering / playing game ? I am using GKLocalPlayer and game centre to enter in game and ( and leaderboard to get data ) I need to know is this first time player is playing this game.

Answer 1

Just store a boolean locally in NSUserDefaults.

NSString *hasCompletedFirstLaunchKey = @"kHasCompletedFirstLaunchKey";
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (![defaults objectForKey:hasCompletedFirstLaunchKey]) {

    //first time code goes here

    //set the key to yes
    [defaults setObject:@YES forKey:hasCompletedFirstLaunchKey];
    [defaults synchronize];
}