iphone - iOS state restoration issue with DrawerController -


i have app written in swift 3.1, using xcode 8.3.3.

i trying implement state preservation/restoration.

to have implemented shouldsaveapplicationstate , willfinishlaunchingwithoptions methods in appdelegate.swift , set return true:

// appdelegate.swift // state restoration callbacks  func application(_ application: uiapplication, shouldsaveapplicationstate coder: nscoder) -> bool {     debug_print(this: "shouldsaveapplicationstate")     return true } func application(_ application: uiapplication, shouldrestoreapplicationstate coder: nscoder) -> bool {     debug_print(this: "shouldrestoreapplicationstate")     restoringstate = true     return true }  func application(application: uiapplication, willfinishlaunchingwithoptions launchoptions: [nsobject : anyobject]?) -> bool {     debug_print(this: "willfinishlaunchingwithoptions")     return true }

i’ve provided restoration ids involved viewcontrollers , navigationcontrollers.

i'm using 3rd party library handle side drawer navigation container (https://github.com/sascha/drawercontroller). initial viewcontroller set programmatically inside didfinishlaunchingwithoptions method, see below.

// appdelegate.swift var centercontainer: drawercontroller?  func application(_ application: uiapplication, didfinishlaunchingwithoptions launchoptions: [uiapplicationlaunchoptionskey: any]?) -> bool {      let mainstoryboard: uistoryboard = uistoryboard(name: "main", bundle: nil)     let centerviewcontroller =   mainstoryboard.instantiateviewcontroller(withidentifier: "rootviewcontrollernav") as! uinavigationcontroller      let leftviewcontroller = mainstoryboard.instantiateviewcontroller(withidentifier: "sidedrawerviewcontroller") as! uitableviewcontroller      centercontainer = drawercontroller(centerviewcontroller: centerviewcontroller, leftdrawerviewcontroller: leftviewcontroller)      centercontainer?.restorationidentifier = "drawercontrollerview"     window = uiwindow(frame: uiscreen.main.bounds)     window?.restorationidentifier = "mainwindow"     window?.rootviewcontroller = centercontainer     window?.makekeyandvisible()      return true }

when app opens , attempts restore state, displays correct viewcontroller (last controller before app closed) temporarily, once app becomes active reverts initial viewcontroller.

for example, following happens:

  1. open app navigate “settings” view via side menu
  2. navigate home screen
  3. stop running xcode , start again
  4. app open showing settings view, revert home view

can tell me causing this, or going wrong? let me know if need more code examples.

func application(_ application: uiapplication, didfinishlaunchingwithoptions launchoptions: [uiapplicationlaunchoptionskey: any]?) -> bool {         // override point customization after application launch.          let mainstoryboard: uistoryboard = uistoryboard(name: "main", bundle: nil)         let leftsidedrawerviewcontroller = mainstoryboard.instantiateviewcontroller(withidentifier: "sidedrawerviewcontroller") as! uitableviewcontroller         let centerviewcontroller = mainstoryboard.instantiateviewcontroller(withidentifier: "rootviewcontrollernav") as! uinavigationcontroller         let navigationcontroller = uinavigationcontroller(rootviewcontroller: centerviewcontroller)         navigationcontroller.restorationidentifier = "navigationcontrollerkey"         let leftsidenavcontroller = uinavigationcontroller(rootviewcontroller: leftsidedrawerviewcontroller)         leftsidenavcontroller.restorationidentifier = "leftnavigationcontroller"         self.drawercontroller = drawercontroller(centerviewcontroller: navigationcontroller, leftdrawerviewcontroller: leftsidenavcontroller, rightdrawerviewcontroller: nil)         self.drawercontroller.opendrawergesturemodemask = .all         self.drawercontroller.closedrawergesturemodemask = .all         self.window = uiwindow(frame: uiscreen.main.bounds)         self.window?.rootviewcontroller = self.drawercontroller         return true     }

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