Question

I was wondering how would I determine on the launch of my application whether or not it was opened for the first time.

I was thinking that I need a bool instance variable. But after that I’m just not sure.

Answer 1

NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];   
BOOL haveused = [standardUserDefaults boolForKey:@"haveused"];

if(haveused)
{       
    //NOT THEIR FIRST TIME
    //Handle scenario
}
else
{
    //THEIR FIRST TIME
    //Handle scenario
    [standardUserDefaults setBool:TRUE forKey:@"haveused"];
    [standardUserDefaults synchronize];
}

The only exception is if the user deletes and reinstalls your application. If they delete and reinstall, it wipes your applications memory clean, and it will see the user as a first timer. But this will remain functional throughout updates.