ios – 存储在SSKeychain中的CFUUID在某些设备中为空

我将这些设备ID保存在服务器中,我最近注意到一些用户为同一个真实设备拥有多个这些ID.我看到的唯一解释是ID没有从Keychain保存或加载,因此设备生成一个新ID.奇怪的是,它在运行相同iOS版本的其他一些设备上运行良好.

关于可能发生什么的任何想法？

这是我在(BOOL)应用程序中的相关代码：(UIApplication *)application didFinishLaunchingWithOptions：(NSDictionary *)launchOptions

NSString* identifier = @"appName";
NSString* servicename = @"com.company.appName";
NSString *retrieveuuid = [SSKeychain passwordForservice:servicename account:identifier];
if (retrieveuuid == nil) {
    CFUUIDRef theUUID = CFUUIDCreate(null);
    CFStringRef String = CFUUIDCreateString(NULL,theUUID);
    CFRelease(theUUID);
    NSString *uuid  = (NSString*) String;
    [SSKeychain setpassword:uuid forservice:servicename account:identifier];
}

编辑：我的猜测是,由于某种原因,retrieveuuid == nil没有按预期工作.稍后在应用程序中,我@L_944_5@了推送通知,并将推送令牌与我用同一行[SSKeychain passwordForservice：servicename account：identifier]读取的CFUUID一起发送到服务器,但是当它被发送到服务器时它不是零(@R_352_9447@看到几个具有相同推送令牌的CFUUID).

编辑2以附加更多实际代码.

AppDelegate.m

NSString* identifier = @"appName";
NSString* servicename = @"com.company.appName";
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //CreaTing UUID
    NSString *retrieveuuid = [AppDelegate getdeviceid];
    if (retrieveuuid == nil) {
        CFUUIDRef theUUID = CFUUIDCreate(null);
        CFStringRef String = CFUUIDCreateString(NULL,theUUID);
        CFRelease(theUUID);
        NSString *uuid  = (NSString*) String;
        [SSKeychain setpassword:uuid forservice:servicename account:identifier];
    }

    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
     (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
}

+ (NSString*) getdeviceid {
    return [SSKeychain passwordForservice:servicename account:identifier];
}

- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviCEToken:(NSData*)deviCEToken
{
    NSString *newToken = [deviCEToken description];
    newToken = [newToken StringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersinstring:@"<>"]];
    newToken = [newToken StringByreplacingoccurrencesOfString:@" " withString:@""];

    _deviCEToken = [[NSString alloc] initWithString:newToken];

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    NSString *user = [prefs objectForKey:@"appNameUsername"];

    if(user && ![user isEqualToString:@""]){
        RestClient *rest = [[RestClient alloc] init];
        rest.delegate = self;
        rest.tag = 2;
        [rest updateToken:newToken ForUsername:user];
        [rest release];
    }
}

RestClient.m

-(void) updateToken:(NSString *)token ForUsername:(NSString *)userName{
    NSArray* info = [NSArray arrayWithObject: [NSMutableDictionary DictionaryWithObjectsAndKeys:
                                               userName,@"Username",token,@"TokenNo",[[UIDevice currentDevice].model hasPrefix:@"iPad"] ? @"iPad" : @"iPhone",@"Device",[UIDevice currentDevice].systemVersion,@"OSVersion",[AppDelegate getdeviceid],@"deviceid",@"updateToken",@"CMD",nil]];
    [self doAction:info];
}

doAction方法只是将数据发送到服务器然后回调委托,该部分工作正常.我可以在服务器上看到接收此命令的日志：

"JSONCMD":"[
{   "TokenNo" : "f0d3aa21758350333b7e6315c38_EDIT_257c1838f49c43049f8380ec1ff63","AppVersion" : "1.0.4","Username" : "user@server.com","CMD" : "updateToken","OSVersion" : "7.0.4","deviceid" : "9B794E11-6EF7-470C-B319-5A9FCCDAFD2B","Device" : "iPhone"
}
]

我看到2个可能导致奇怪行为的候选者,控制器主体中的NSStrings和静态getDevice方法.但是,我不知道这在许多设备中如何工作,但在其他设备中却失败了.