swift - UINavigationController acting funny after pushViewController UPDATE 2 -

i'm having weird problem, have slide menu in app, unknown reason every time go 1 view using .pushviewcontroller instruction navigation controller acts funny , resets uibarbuttonitems. (they change original tintcolor, , badgevalue disappears).

this methods i'm using in slide menu transition:

func openviewcontrollerbasedonidentifier(_ stridentifier:string){     let destviewcontroller : uiviewcontroller = self.storyboard!.instantiateviewcontroller(withidentifier: stridentifier)       let topviewcontroller : uiviewcontroller = self.navigationcontroller!.topviewcontroller!      if (topviewcontroller.restorationidentifier! == destviewcontroller.restorationidentifier!){         print("same vc")     } else {         var numeroproductos = string(carrito.numprod)          self.navigationcontroller!.pushviewcontroller(destviewcontroller, animated: true)       } } 

and

func slidemenuitemselectedatindex(_ index: int32) {     let topviewcontroller: uiviewcontroller = self.navigationcontroller!.topviewcontroller!     print("view controller : \(topviewcontroller) \n", terminator: "")     switch(index) {     case 0:         print("home\n", terminator: "")          self.openviewcontrollerbasedonidentifier("home")          break      case 1:         print("play\n", terminator: "")          self.openviewcontrollerbasedonidentifier("micuenta")          break      case 2:         print("play\n", terminator: "")          self.openviewcontrollerbasedonidentifier("quienessomos")          break      case 3:         print("play\n", terminator: "")          self.openviewcontrollerbasedonidentifier("nuestracausa")          break      case 4:         print("play\n", terminator: "")          self.openviewcontrollerbasedonidentifier("contacto")          break      case 5:         print("play\n", terminator: "")          self.openviewcontrollerbasedonidentifier("faq")          break      default:         print("default\n", terminator: "")     } } 

according apple's own documentation:

a uinavigationitem object manages buttons , views displayed in uinavigationbar object. when building navigation interface, each view controller pushed onto navigation stack must have uinavigationitem object contains buttons , views wants displayed in navigation bar. managing uinavigationcontroller object uses navigation items of topmost 2 view controllers populate navigation bar content.

but not happening, button there in interfase builder , works when land on view without using slide menu, disappears when click option of slide menu.

this code have on viewdidload method on view

override func viewdidload() {     super.viewdidload()     addslidemenubutton()     carrito.numprod = productoscarrito.count     print(productoscarrito.count)     var numeroproductos = string(carrito.numprod)     navigationitem.rightbarbuttonitem?.badgevalue = numeroproductos  } 

if reach page without using slidemenu (like when segue there after succesfully clearing login view) badgevalue shown properly

but if use slide menu happens

any ideas on causing issue?

update

i discovered something.

if insert instruction either in openviewcontrollerbasedonidentifier method or in slidemenuselectedatindex

navigationitem.rightbarbuttonitem?.badgevalue = "25" 

the badgevalue gets changed number before disappearing, i'm using instruction

print("badge value:\(navigationitem.rightbarbuttonitem?.badgevalue any)") 

so value there because in debug console:

badge value: optional("40") 

but unknown reason disappears

udate 2

 self.navigationcontroller!.pushviewcontroller(destviewcontroller, animated: false) 

i discovered if turn off animation badgevalue doesn't disappear, need animation work too.

i found solution , it's simple actually, avoid behavior badgevalue should set in viewdidlayoutsubviews() instead of viewdidload()

override func viewdidlayoutsubviews() {     var numeroproductos = string(carrito.numprod)     carritobutton.badgevalue = numeroproductos } 

edit mikemtol's library buggy , causes lot of problems not 1 swift users recommend these extensions instead. -> link