1. Add friends in the game center. You can add game friends through address book friends or Facebook, or by inviting nearby players of the same game.

2. Click to enter the game center. First, log in to the account to modify the personal profile information, and then find the option of friends to enter the interface.

3. If you don’t have a single friend, the system will prompt you: Activate iCloud address book and Facebook in settings to get personalized dating recommendations.

4. Then follow the prompts to return to Settings - Game Center, and then turn on friend recommendations on the interface, that is, turn on both the address book and Facebook. If there is no Facebook, you need to register and log in, and then use Facebook Add friends.

5. You can also enable game invitations, especially for nearby players. You can add players of the same game center nearby.

If you have bound a Facebook account, you can use Facebook to add friends, or use Messages to add friends, and the friend will appear in the game.

This may be a bug in iOS 10. The designer did not provide a good entrance. Now it can only be added in the game.

In fact, Apple has integrated Game Center into the system’s Messages program. That said, features like multiplayer invites are now incorporated into the messaging program.