使用MMDrawer在iOS中进行状态保存和恢复问题

Question

I have integrated the MMDrawerController Library in an iOS application and now I have a requirement to Restore application state even though application is killed in background(Only when application is enter from foreground to background), it is working fine with normal navigation application but when I change Navigation using " setCenterViewController " option in my application, restoration is not working as expected and I have followed all instruction provided in this link: " https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/PreservingandRestoringState.html "

I have used setCenterViewController option(Recommended from MMDrawer) to navigates to particular screen and then deleted app in background , When we reopened it is launching with default initial screen but we are expecting it should reopen with Screen it has before Entering to Background.

and here is the code snippet:

AppDelegate *appDelegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];
appDelegate.homeController.navigationController.navigationBarHidden = YES;
HomeViewController *homeVC = [[HomeViewController alloc] initWithNibName:@"HomeViewController" bundle:nil];
UINavigationController *_navg = [[UINavigationController alloc]initWithRootViewController:homeVC];
_navg.restorationIdentifier = @"homeNavigationController";
homeVC.title = [self.dataSource objectAtIndex:indexPath.row]; homeVC.restorationIdentifier = @"HomeViewController";
[appDelegate.drawerController setCenterViewController:_navg withCloseAnimation:YES completion:nil];
self.currentViewController = _navg;
self.currentViewController.restorationIdentifier = @"homeNavigationController"; 

---

Help me to resolve this issue.

Answer 1

You can easily do state preservation by storing states in NSUUserDefault Do the following steps: 1.When you launch the app first time.

  {
      UserDefaults.standard.set("0", forKey: "state")
     UserDefaults.standard.synchronize()
   }

2.When you kill the app then store the state

   {    
            UserDefaults.standard.set("1", forKey: "state")
             UserDefaults.standard.synchronize()
        }

3. When you relaunch the app get the state ,setup the drawer and move to particular controller using it's navigation controller.



 if let state = UserDefaults.standard.object(forKey: "state") as? String{
         switch state{
                case "0":
                        //Do setup for MMDrawer for center ,left and right view
                        break
                case "1":
                        //Do setup for MMDrawer for center ,left and right view

                break
                 default:
                        break
                    }
                }