Displaying Achievement Progress

Without being able to display the current progress of achievements to the user, they are next to useless. If required to present a custom interface for achievements, refer to the section “Going Further with Achievements.” The following method launches the combined Game Center View Controller that is new in iOS 6, as shown in Figure 4.3:

Click here to view code image

- (void)showAchievements{    [[GKGameCenterViewController sharedController] setDelegate:self];    [[GKGameCenterViewController sharedController] setViewState:GKGameCenterViewControllerStateAchievements];    [self presentViewController:[GKGameCenterViewController sharedController] animated:YES completion: nil];}

In the preceding method, used to launch ...

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