iphone - The UDID is always returning zero data from keychain in IOS? -

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i had application in saving [[[uidevice currentdevice] identifierforvendor] uuidstring] on keychain this:

nsstring *bundleid = [[[nsbundle mainbundle] infodictionary] objectforkey:@"cfbundleidentifier"];  nsstring *strapplicationuuid;    if(![keychainitem objectforkey:(__bridge id)(ksecvaluedata)]){         nsstring *idfa = [[[uidevice currentdevice] identifierforvendor] uuidstring];           nslog(@"bundleid %@",idfa);         [keychainitem setobject:idfa forkey:(__bridge id)(ksecvaluedata)];         nslog(@"saving item %@", [keychainitem objectforkey:(__bridge id)(ksecvaluedata)]);          strapplicationuuid=[keychainitem objectforkey:(__bridge id)(ksecvaluedata)];    }else{         nslog(@"saved item %@", [keychainitem objectforkey:(__bridge id)(ksecvaluedata)]);      strapplicationuuid=[keychainitem objectforkey:(__bridge id)(ksecvaluedata)];     }  // nsstring *strapplicationuuidstr = [[nsstring alloc] initwithdata:[keychainitem objectforkey:(__bridge id)(ksecvaluedata)]                                                  //encoding:nsutf8stringencoding];  nslog(@"%@",strapplicationuuidstr); nslog(@"%@",strapplicationuuid);  return strapplicationuuid;

but giving me 0 data.its not saving first time ,can me on this?

your app may rejected due apple prevent use udid:-

may you:

-(nsstring *)getuniquedeviceidentifierasstring {   nsstring *appname=[[[nsbundle mainbundle] infodictionary] objectforkey:(nsstring*)kcfbundlenamekey];   nsstring *strapplicationuuid = [sskeychain passwordforservice:appname account:@"incoding"];  if (strapplicationuuid == nil)  {     strapplicationuuid  = [[[uidevice currentdevice] identifierforvendor] uuidstring];     [sskeychain setpassword:strapplicationuuid forservice:appname account:@"incoding"];  }   return strapplicationuuid; }

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