How to get root view controller

Question

I need an instance of root view controller    I tried those approaches   UIViewController  rootViewController    UIViewController     UIApplication sharedApplication  keyWindow  rootViewController     Returns   null   Also when I try to get an array of controllers   NSArray  viewControllers   self navigationController viewControllers    It returns only one controller  but it isn t my root view controller   If I try to take from navigation controller   UIViewController  root    UIViewController   self navigationController viewControllers objectAtIndex 0     Returns   null   Any ideas why   What else could I try to get an instance of my root view controller   Thanks

User · Answer

Swift 3  Chage ViewController withOut Segue and send AnyObject  Use  Identity  MainPageViewController on target ViewController                                        let mainPage   self storyboard  instantiateViewController withIdentifier   MainPageViewController   as  MainPageViewController  var mainPageNav   UINavigationController rootViewController  mainPage   self present mainPageNav  animated  true  completion  nil    or if you want to Change View Controller and send Data  let mainPage   self storyboard  instantiateViewController withIdentifier   MainPageViewController   as  MainPageViewController  let dataToSend      Any String    or  var ObjectToSend   AnyObject     mainPage getData   dataToSend   var mainPageNav   UINavigationController rootViewController  mainPage   self present mainPageNav  animated  true  completion  nil

User · Answer

Swift way to do it  you can call this from anywhere  it returns optional so watch out about that        EZSwiftExtensions - Gives you the VC on top so you can easily push your popups var topMostVC  UIViewController        var presentedVC   UIApplication sharedApplication   keyWindow  rootViewController     while let pVC   presentedVC  presentedViewController           presentedVC   pVC            if presentedVC    nil           print  EZSwiftExtensions Error  You don t have any views set  You may be calling them in viewDidLoad  Try viewDidAppear instead              return presentedVC     Its included as a standard function in   https   github com goktugyil EZSwiftExtensions

User · Answer

As suggested here by  0x7fffffff  if you have UINavigationController it can be easier to do   YourViewController  rootController        YourViewController             self navigationController viewControllers objectAtIndex  0     The code in the answer above returns UINavigation controller  if you have it  and if this is what you need  you can use self navigationController

User · Answer

Swift 3  let rootViewController   UIApplication shared keyWindow  rootViewController

User · Answer

Unless you have a good reason  in your root controller do this     NSNotificationCenter defaultCenter  addObserver self                                          selector  selector onTheEvent                                                name   ABCMyEvent                                             object nil     And when you want to notify it     NSNotificationCenter defaultCenter  postNotificationName   ABCMyEvent                                                  object self

User · Answer

Objective-C  UIViewController  controller    UIApplication sharedApplication  keyWindow rootViewController    Swift 2 0  let viewController   UIApplication sharedApplication   keyWindow  rootViewController   Swift 5  let viewController   UIApplication shared keyWindow  rootViewController

User · Answer

if you are trying to access the rootViewController you set in your appDelegate  try this   Objective-C  YourViewController  rootController    YourViewController     YourAppDelegate                                        UIApplication sharedApplication delegate  window  rootViewController     Swift  let appDelegate    UIApplication sharedApplication   delegate as AppDelegate let viewController   appDelegate window  rootViewController as YourViewController   Swift 3  let appDelegate    UIApplication shared delegate as  AppDelegate let viewController   appDelegate window  rootViewController as  YourViewController   Swift 4  amp  4 2  let viewController   UIApplication shared keyWindow  rootViewController as  YourViewController   Swift 5  amp  5 1  amp  5 2  let viewController   UIApplication shared windows first  rootViewController as  YourViewController

[objective-c] How to get root view controller?

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