问题重述：

iOS 8中改变了通知注冊的方式，假设App须要同一时候支持iOS 7 和 8 的话，须要首先检查selector。

解决方式：在Xcode 6中

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
    //-- Set Notification
    if ([application respondsToSelector:@selector(isRegisteredForRemoteNotifications)]) 
    {
           // iOS 8 Notifications
           [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];

           [application registerForRemoteNotifications];
    }
    else
    {
          // iOS < 8 Notifications
          [application registerForRemoteNotificationTypes:
                     (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound)];
    }

     //--- your custom code
     return YES;
}

參考：

http://stackoverflow.com/questions/24454033/registerforremotenotificationtypes-is-not-supported-in-ios-8-0-and-later

代码转载自：

http://stackoverflow.com/a/24773465/3458781