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      UIApplication *app = [UIApplication sharedApplication];

      

  //    根据用户版本,获取用户权限

      if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8) {

          UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge) categories:nil];

          [app registerUserNotificationSettings:settings];

      }

  //    设置徽章

      app.applicationIconBadgeNumber = 18;

  }

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原文地址：http://www.cnblogs.com/GLbog/p/4955025.html