Warning Attempt to present on whose view is not in the window hierarchy - swift

Question

I m trying to present a ViewController if there is any saved data in the data model  But I get the following error       Warning  Attempt to present   on  whose view is not in the window hierarchy     Relevant code   override func viewDidLoad         super viewDidLoad       loginButton backgroundColor   UIColor orangeColor        var request   NSFetchRequest entityName   UserData       request returnsObjectsAsFaults   false      var appDel AppDelegate    UIApplication sharedApplication   delegate as AppDelegate      var context NSManagedObjectContext   appDel managedObjectContext       var results NSArray   context executeFetchRequest request  error  nil        if results count  lt   0           print  Inga resultat         else           print  SWITCH VIEW PLOX           let internVC   self storyboard  instantiateViewControllerWithIdentifier  internVC   as internViewController         self presentViewController internVC  animated  true  completion  nil            I ve tried different solutions found using Google without success

User · Answer

I was getting this error while was presenting controller after the user opens the deeplink. I know this isn't the best solution, but if you are in short time frame here is a quick fix - just wrap your code in asyncAfter:

DispatchQueue.main.asyncAfter(deadline: .now() + 0.7, execute: { [weak self] in
                                navigationController.present(signInCoordinator.baseController, animated: animated, completion: completion)
                            })

It will give time for your presenting controller to call viewDidAppear.

User · Answer

Swift Method  and supply a demo   func topMostController   - gt  UIViewController       var topController  UIViewController   UIApplication sharedApplication   keyWindow  rootViewController      while  topController presentedViewController    nil            topController   topController presentedViewController            return topController    func demo         let vc   ViewController       let nav   UINavigationController init rootViewController  vc      topMostController   present nav  animated  true  completion  nil

User · Answer

Swift 3  I had this keep coming up as a newbie and found that present loads modal views that can be dismissed but switching to root controller is best if you don t need to show a modal    I was using this  let storyboard   UIStoryboard name   Main   bundle  nil  let vc    storyboard  instantiateViewController withIdentifier   MainAppStoryboard   as  TabbarController present vc  animated  false  completion  nil    Using this instead with my tabController   let storyboard   UIStoryboard name   Main   bundle  nil  let view   storyboard instantiateViewController withIdentifier   MainAppStoryboard   as UIViewController let appDelegate   UIApplication shared delegate as  AppDelegate   show window appDelegate window  rootViewController   view   Just adjust to a view controller if you need to switch between multiple storyboard screens

User · Answer

Swift 4  func topMostController   - gt  UIViewController       var topController  UIViewController   UIApplication shared keyWindow  rootViewController      while  topController presentedViewController    nil            topController   topController presentedViewController            return topController

User · Answer

Swift 3   Call this function to get the topmost view controller  then have that view controller present   func topMostController   - gt  UIViewController       var topController  UIViewController   UIApplication shared keyWindow  rootViewController          while  topController presentedViewController    nil                topController   topController presentedViewController                    return topController         Usage   let topVC   topMostController   let vcToPresent   self storyboard  instantiateViewController withIdentifier   YourVCStoryboardID   as  YourViewController topVC present vcToPresent  animated  true  completion  nil

User · Answer

for SWIFT  func topMostController   - gt  UIViewController       var topController  UIViewController   UIApplication sharedApplication   keyWindow  rootViewController      while  topController presentedViewController    nil            topController   topController presentedViewController            return topController

User · Answer

Swift 5 1   let storyboard   UIStoryboard init name   Main   bundle  Bundle main  let mainViewController   storyboard instantiateViewController withIdentifier   ID   let appDeleg   UIApplication shared delegate as  AppDelegate let root   appDeleg window  rootViewController as  UINavigationController root pushViewController mainViewController  animated  true

User · Answer

The previous answers relate to the situation where the view controller that should present a view 1  has not been added yet to the view hierarchy  or 2  is not the top view controller  Another possibility is that an alert should be presented while another alert is already presented  and not yet dismissed

User · Answer

I have tried so many approches  the only useful thing is   if var topController   UIApplication shared keyWindow  rootViewController     while  topController presentedViewController    nil          topController   topController presentedViewController

User · Answer

Rather than finding top view controller  one can use  viewController modalPresentationStyle   UIModalPresentationStyle currentContext   Where viewController is the controller which you want to present This is useful when there are different kinds of views in hierarchy like TabBar  NavBar  though others seems to be correct but more sort of hackish  The other presentation style can be found on apple doc

User · Answer

let storyboard   UIStoryboard name   test   bundle  nil  let vc   storyboard instantiateViewController withIdentifier   teststoryboard   as UIViewController UIApplication shared keyWindow  rootViewController  present vc  animated  true  completion  nil    This seemed to work to make sure it s the top most view    I was getting an error     Warning  Attempt to present myapp testController  0x7fdd01703990 on myapp testController  0x7fdd01703690 whose view is not in the window hierarchy    Hope this helps others with swift 3

User · Answer

For swift 3 0 and above   public static func getTopViewController   - gt  UIViewController   if var topController   UIApplication shared keyWindow  rootViewController     while  topController presentedViewController    nil          topController   topController presentedViewController        return topController   return nil

User · Answer

All implementation for topViewController here are not fully supporting cases when you have UINavigationController or UITabBarController  for those two you need a bit different handling   For UITabBarController and UINavigationController you need a different implementation   Here is code I m using to get topMostViewController   protocol TopUIViewController       func topUIViewController   - gt  UIViewController     extension UIWindow   TopUIViewController       func topUIViewController   - gt  UIViewController            if let rootViewController   self rootViewController               return self recursiveTopUIViewController from  rootViewController                     return nil            private func recursiveTopUIViewController from  UIViewController   - gt  UIViewController            if let topVC   from  topUIViewController     return recursiveTopUIViewController from  topVC     from           return from          extension UIViewController   TopUIViewController        objc open func topUIViewController   - gt  UIViewController            return self presentedViewController          extension UINavigationController       override open func topUIViewController   - gt  UIViewController            return self visibleViewController          extension UITabBarController       override open func topUIViewController   - gt  UIViewController            return self selectedViewController    presentedViewController

User · Answer

At this point in your code the view controller s view has only been created but not added to any view hierarchy  If you want to present from that view controller as soon as possible you should do it in viewDidAppear to be safest

User · Answer

Use of main thread to present and dismiss view controller worked for me   DispatchQueue main async   self present viewController  animated  true  completion  nil

User · Answer

You just need to perform a selector with a delay -  0 seconds works            override func viewDidLoad         super viewDidLoad       perform  selector presentExampleController   with  nil  afterDelay  0      objc private func presentExampleController         let exampleStoryboard   UIStoryboard named   example   bundle  nil      let exampleVC   storyboard instantiateViewController withIdentifier   ExampleVC   as  ExampleVC     present exampleVC  animated  true

User · Answer

In objective c  This solved my problem when presenting viewcontroller on top of mpmovieplayer  -  UIViewController   topMostController       UIViewController  topController    UIApplication sharedApplication  keyWindow rootViewController       while  topController presentedViewController            topController   topController presentedViewController             return topController

[ios] Warning: Attempt to present * on * whose view is not in the window hierarchy - swift

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