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资源说明：Game Center styled UI notifications
GKAchievementNotification ========================= What is it? ----------- Game Center has a notification window that slides down and informs the GKLocalPlayer that they've been authenticated. The GKAchievementNotification classes are a way to display achievements awarded to the player in the same manner; more similar to Xbox Live style achievement popups. The achievement dialogs are added to the UIWindow view of your application. Using it -------- Add the folder (.h, .m, images) to your Xcode project. The GKAchievementHandler class handles the display of the notifications. You'll primarily use that (there'd usually be no reason to create a notification directly). When your player earns an achievement, you can notify them of this via GKAchievementHandler:// grab an achievement description from where ever you saved them GKAchievementDescription *achievement = [[GKAchievementDescription alloc] init]; // notify the user [[GKAchievementHandler defaultHandler] notifyAchievement:achievement];You can also use custom messages instead of a GKAchievementDescription object:[[GKAchievementHandler defaultHandler] notifyAchievementTitle:@"High Roller" andMessage:@"Earned 100 points online."];Customization ------------- Apples Guidelines state that "it is up to you to do so in a way that fits the style of your game". and Allan Schaffer of Apple stated in the forums that "[the] best way to do that would be to present a custom dialog using the look and feel of *your* game." This to me means you may be rejected for using Apple's artwork in a custom application. If this worries you, use thesetImage:methods to change the logo displayed in the dialog or change the gk-icon.png images in your images. You can also set the image to nil to not show any image:[[GKAchievementHandler defaultHandler] setImage:nil];You can also edit the gk-notification.png images to change the stretchable background.
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