ios - Swift / How to hide NavigationBar with Root View Controller / Page View Controller. Little gap on top of screen -

i'm using swipeviewcontroller.

it's sub class of uinavigationcontroller, uipageviewcontrollerdelegate, uiscrollviewdelegate

the view instantiated within appdelegate.swift by:

    let pagecontroller = uipageviewcontroller(transitionstyle: .scroll, navigationorientation: .horizontal, options: nil)     let navigationcontroller = viewcontroller(rootviewcontroller: pagecontroller)     self.window?.rootviewcontroller = navigationcontroller     self.window?.makekeyandvisible() 

the complete code of viewcontroller is:

import uikit import swipeviewcontroller  class viewcontroller: swipeviewcontroller {      override func viewdidload() {         super.viewdidload()          navigationbar.hidden = true          let vc1 = uiviewcontroller()         vc1.view.backgroundcolor = uicolor(red: 0.19, green: 0.36, blue: 0.60, alpha: 1.0)         vc1.title = "recent"         let vc2 = uiviewcontroller()         vc2.view.backgroundcolor = uicolor(red: 0.70, green: 0.23, blue: 0.92, alpha: 1.0)         vc2.title = "random"          setviewcontrollerarray([vc1, vc2])         setfirstviewcontroller(0)      } } 

my problem is, once app started, no matter if in simulator or physical device. there gap in exact height of status bar.

once press on screen, view "moves up".

also. 1 time i'm able grab view , grab down. screen "run back" top (like in graphic bug) , moment on, till next app start, screen "locked" window. condition want time....

what best practise delete "bugs", have navigationbar hidden , views locked window? appreciated.

ps. if don't hide navigationbar, there no bug @ all.

pps. can download sample project provided github link. it's same.

to solve similar problem i've created singleton class implement uinavigationcontrollerdelegate. , implemented following method:

public func navigationcontroller(navigationcontroller: uinavigationcontroller, willshowviewcontroller viewcontroller: uiviewcontroller, animated: bool) { if (viewcontroller.ismemberofclass:(youruiviewcontrollessubclass1.self)){     //or detection     navigationcontroller.navigatonbarhidden = true//or false if needed } else if (viewcontroller.ismemberofclass:(youruiviewcontrollessubclass2.self)){     navigationcontroller.navigatonbarhidden = true//or false if needed }/ ... may check others 

i wish solve problem