iphone - How to manage state in ios objective c -

i’m new in ios development. question is, i’ve 2 view controllers.

viewcontroller - viewcontroller - b

now, if killed app viewcontroller - , relaunch app. app must open viewcontroller - a. , if killed app viewcontroller - b , relaunch app. app must open viewcontroller - b.

can me, i’ve done rnd can not find proper solution.

thanks

1. make shareddelegate in appdelegate.m file

   +(appdelegate *)shareddelegate {

   return (appdelegate *) [uiapplication sharedapplication].delegate;

   }

2. in appdelgate.h

   +(appdelegate *)shareddelegate; @property (nonatomic,strong) nsstring *currentviewcontoller;

3. when push anycontoller set appdelegates currentviewcontoller new vc

viewcontroller *vc=[[viewcontroller alloc]init]; [self.navigationcontroller pushviewcontroller:vc animated:yes];

[appdelegate shareddelegate].currentviewcontoller=nsstringfromclass([viewcontroller class]);

4. now when app terminated

   • (void)applicationwillterminate:(uiapplication *)application {

   // called when application terminate. save data if appropriate. see applicationdidenterbackground:.

[[nsuserdefaults standarduserdefaults]setobject:[appdelegate shareddelegate].currentviewcontoller forkey:@"cuurentvc"];

} 

5 when app launched first time check previous controller when app terminated

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {      nsstring *string=[[nsuserdefaults standarduserdefaults] valueforkey:@"cuurentvc"]; 

and push class

    uiviewcontroller *object = [[nsclassfromstring(string) alloc] init...];  }