Adding Achievement Hooks
Arguably the most difficult aspect of incorporating achievements into your iOS app is hooking them into the workflow. For example, the player might earn an achievement after collecting 100 coins in a role-playing game. Every time a coin is collected, the app will need to update the achievement value.
A more difficult example is an achievement such as play one match a week for six months. This requires a number of hooks and checks to make sure that the user is meeting the requirements of the achievement. Although attempting to document every single possible hook is a bit ambitious, the section “Adding Achievements into Whack-a-Cac” has several types of hooks that will be demonstrated.
Before an achievement can be progressed, ...
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