iOS APNS device Token 是否會改變?

 通過真機調試以下代碼：開發環境擷取的deviceToken和釋出環境擷取的deviceToken當然是不一樣的！ 

而且在開發環境和釋出環境中如果開發證書不一樣的話擷取的deviceToken也不一樣，親測！！！

文章末尾讨論釋出環境的deviceToken 。。。       

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    self.window = [[UIWindow alloc] init];
    self.window.backgroundColor = [UIColor whiteColor];
    self.window.frame = [[UIScreen mainScreen] bounds];
  
   [self registerNotification:application];

    [self.window makeKeyAndVisible];
    return YES;
}
           

- (void)registerNotification:(UIApplication *)application
{
    if ([[[UIDevice currentDevice] systemVersion] floatValue]>=8) {
        if ([application respondsToSelector:@selector(registerUserNotificationSettings:)])
        {
            UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil];
            [application registerUserNotificationSettings:settings];
            [application registerForRemoteNotifications];
        }
    }else
    {
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes: (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
        
        NSLog(@"not isIOS8");
    }
}
           

///Token值成功擷取的時候走的是這個方法（Token值不能帶空格）
-(void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    
    NSLog(@"deviceToken----------->%@",deviceToken);
    NSString *pushToken = [[[[deviceToken description]
                             
                             stringByReplacingOccurrencesOfString:@"<" withString:@""]
                            
                            stringByReplacingOccurrencesOfString:@">" withString:@""]
                           
                           stringByReplacingOccurrencesOfString:@" " withString:@""] ;

    NSLog(@"pushToken----------->%@",pushToken);
    
}

///Token值擷取失敗的時候走的是這個方法
-(void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
{
    
    NSLog(@"Token值擷取失敗,error--->%@",error);
}

///應用程式處在打開狀态，且伺服器有推送消息過來時，以及通過推送打開應用程式，走的是這個方法
-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    for (id key in userInfo) {
        NSLog(@"%@:%@",key, [userInfo objectForKey:key]);
    }
    
    ///Icon推送數量設為0
    application.applicationIconBadgeNumber=0;
    
}
           

   現在來讨論釋出環境的deviceToken，之前我認為是不會改變的，但後來發現貌似會變。當然這個調試就需要去回複iPhone手機了，如果你願意可以去試試，弄個不用的iPhone4，iPhone4s之類的。

   if a device is wiped， it will get a new device token. （如果一個裝置被清除，它将獲得一個新的裝置令牌。）

官方網站是這樣寫的： If the user restores backup data to a new device or computer, or reinstalls the operating system, the device token changes

正是因為device有可能改變，是以官方描述：An application should register every time it launches and give its provider the current token

是以...不要判斷APP裡是否已經儲存的deviceToken 就不去register了, should every time !! 

另見 iOS Push Notification注意事項