Detecting whether users have previously ever installed the app

Hi
I am making an app with a large "Welcome bonus" that will last the player many weeks, and then after that you must rely on small "daily bonus" that will only last a couple of hours of gameplay, or pay for further bonuses. The user will be able to get around the need to pay or wait for the "daily bonus" by uninstalling and then reinstalling the app in order to get the "welcome bonus" again.
Is there a way to detect if users have previously ever installed the app? The only thing I can think of is forcing the users to "log in" to play the game at all, or only allowing the "welcome bonus" if you log in with your facebook details or confirmed by email. But I perceive this would annoy many people who will simply drop the game when asked for personal information straight up or if they are lacking in common sense or patience, simply uninstall the app without ever playing it due to the request.

 

Hi Rjenman,
How do you save the data about the coins balance? I suppose using PlayerPrefs or with a file.
I think you can use the same methodology and store an integer telling you how many welcome bonuses has the user received.
For example you can do something like this:

Code (CSharp):

1. private const string kWelcomeBonus = "kWelcomeBonus";
2. if (PlayerPrefs.HasKey(kWelcomeBonus)) {
3.   int x = PlayerPrefs.GetInt(kWelcomeBonus);
4.   if (x == 1) {
5.      //The user already received 1 welcome bonus
6.   }
7. }
8. else {
9.    // Give your welcome bonus
10.    PlayerPrefs.SetInt(kWelcomeBonus, 1);
11. }

 

As suggested, one easy option is to make use of Cloud Save (iCloud/Saved games) and you need to inform the user to have it enabled. Or drive him to enable it by saying he gets part of the bonus if he enables icloud or your own login system.