Writing Game Center Apps in iOS

Creating Achievements in iTunes Connect

Problem

You want your game’s users to keep coming back to your app by allowing them to unlock achievements inside your game.

Solution

Use iTunes Connect to create achievements for your game, as demonstrated in the Discussion section.

Discussion

Game Center allows iOS developers to include achievements in their apps and record the player’s progress toward completing an achievement. For instance, you might be writing a first person shooter game. In your game, you have a normal map that the player can walk through and engage in battles with the opponent. You might have decided to include some hidden paths in your game that not everybody can find. Only those who have been playing the game long enough know about these hidden paths. When a player finds a hidden path for the first time, you can report an achievement to the Game Center and give the player some reward in order to keep her interested in the game. The player can then work toward completing that achievement, as each achievement can have a completion percentage.

Let’s consider a simple scenario. Let’s say I find the hidden path in the game. Suppose the game requires me not only to find the path, but also to go to the end of the path for the achievement to be unlocked. When the player finds the path, you can report 0 percent for that achievement. Once the player is halfway through the path, you can report 50 percent for that achievement, and once she goes through the road and comes out of the ...