How to check if a view controller is presented modally or pushed on a navigation stack

Question

How can I  in my view controller code  differentiate between    presented modally pushed on navigation stack   Both presentingViewController and isMovingToParentViewController are YES in both cases  so are not very helpful   What complicates things is that my parent view controller is sometimes modal  on which the to be checked view controller is pushed   It turns out my issue is that I embed my HtmlViewController in a UINavigationController which is then presented  That s why my own attempts and the good answers below were not working   HtmlViewController      termsViewController     HtmlViewController alloc  initWithDictionary dictionary   UINavigationController  modalViewController   modalViewController     UINavigationController alloc  initWithRootViewController termsViewController   modalViewController modalTransitionStyle   UIModalTransitionStyleCoverVertical   self presentViewController modalViewController                    animated YES                  completion nil     I guess I d better tell my view controller when it s modal  instead of trying to determine

User · Answer

Swift 4  var isModal  Bool       return presentingViewController    nil               navigationController  presentingViewController  presentedViewController     navigationController               tabBarController  presentingViewController is UITabBarController

User · Answer

If you are using ios 5 0 or later than please use this code  - BOOL isPresented       if   self isBeingPresented                being presented          return YES        else if   self isMovingToParentViewController                being pushed          return NO        else              simply showing again because another VC was dismissed          return NO

User · Answer

if let navigationController   self navigationController  navigationController isBeingPresented          being presented  else         being pushed

User · Answer

id presentedController   self navigationController modalViewController  if  presentedController            Some view is Presented   else           Some view is Pushed     This will let you know if viewController is presented or pushed

User · Answer

Best ever solution ever is here  if   self navigationController  popViewController animated  true      nil         self dismiss animated  true  completion  nil     Check if Pop Navigation provide nil then Dismiss Controller  It can handle Pop and Dismiss vice versa

User · Answer

Swift 5 Here is solution that addresses the issue mentioned with previous answers  when isModal   returns true if pushed UIViewController is in a presented UINavigationController stack   extension UIViewController       var isModal  Bool           if let index   navigationController  viewControllers firstIndex of  self   index  gt  0               return false           else if presentingViewController    nil               return true           else if navigationController  presentingViewController  presentedViewController    navigationController               return true           else if tabBarController  presentingViewController is UITabBarController               return true           else               return false                     It does work for me so far  If some optimizations  please share

User · Answer

Take with a grain of salt  didn t test   -  BOOL isModal        if  self presentingViewController            return YES       if    self navigationController  presentingViewController  presentedViewController      self navigationController            return YES       if    self tabBarController  presentingViewController  isKindOfClass  UITabBarController class             return YES       return NO

User · Answer

For some one who s wondering  How to tell ViewController that it is being presented  if A is presenting pushing B   Define an enum and property in B  enum ViewPresentationStyle       case Push     case Present      and write property   var vcPresentationStyle   ViewPresentationStyle    Push   default value  considering that B is pushed   Now in A view controller  tell B if it is being presented pushed by assigning presentationStyle  func presentBViewController         let bViewController   B       bViewController vcPresentationStyle    Present   telling B that it is being presented     self presentViewController bViewController  animated  true  completion  nil     Usage in B View Controller  override func viewDidLoad         super viewDidLoad        if self vcPresentationStyle     Present             is being presented            else             is being pushed

User · Answer

self navigationController    nil would mean it s in a navigation stack

User · Answer

Assuming that all viewControllers that you present modally are wrapped inside a new navigationController  which you should always do anyway   you can add this property to your VC   private var wasPushed  Bool       guard let vc   navigationController  viewControllers first where vc    self else           return true            return false

User · Answer

Swift 5  Clean and simple   if navigationController presentingViewController    nil          Navigation controller is being presented modally

User · Answer

As many folks here suggest  that  checking  methods don t work well for all cases  in my project I ve come up with solution to manage that manually  The point is  we usually manage presentation on our own - this is not what happens behind the scene and we must to introspect   DEViewController h file    import  lt UIKit UIKit h gt      it is a base class for all view controllers within a project  interface DEViewController   UIViewController      specify a way viewcontroller  is presented  by another viewcontroller    the presented view controller should manually assign the value to it typedef NS ENUM NSUInteger  SSViewControllerPresentationMethod        SSViewControllerPresentationMethodUnspecified   0      SSViewControllerPresentationMethodPush      SSViewControllerPresentationMethodModal      property  nonatomic  SSViewControllerPresentationMethod viewControllerPresentationMethod      other properties methods     end   The presentations now could be managed this way   pushed on navigation stack      DETestViewController inherits from DEViewController DETestViewController  vc    DETestViewController new   vc viewControllerPresentationMethod   SSViewControllerPresentationMethodPush   self navigationController pushViewController vc animated YES     presented modally with navigation   DETestViewController  vc    DETestViewController new   vc viewControllerPresentationMethod   SSViewControllerPresentationMethodModal  UINavigationController  nav     UINavigationController alloc                                 initWithRootViewController vc    self presentViewController nav animated YES completion nil     presented modally   DETestViewController  vc    DETestViewController new   vc viewControllerPresentationMethod   SSViewControllerPresentationMethodModal   self presentViewController vc animated YES completion nil     Also  in DEViewController we could add a fallback to  checking  if the aforementioned property equals to SSViewControllerPresentationMethodUnspecified   -  BOOL isViewControllerPushed       if  self viewControllerPresentationMethod    SSViewControllerPresentationMethodUnspecified            return  BOOL  self viewControllerPresentationMethod    SSViewControllerPresentationMethodPush              else              fallback to default determination method         return  BOOL self navigationController viewControllers count  gt  1

User · Answer

self navigationController    nil would mean it s in a navigation stack   In order to handle the case that the current view controller is pushed while the navigation controller is presented modally  I have added some lines of code to check if the current view controller is the root controller in the navigation stack   extension UIViewController       var isModal  Bool           if let index   navigationController  viewControllers firstIndex of  self   index  gt  0               return false           else if presentingViewController    nil               return true           else if let navigationController   navigationController  navigationController presentingViewController  presentedViewController    navigationController               return true           else if let tabBarController   tabBarController  tabBarController presentingViewController is UITabBarController               return true           else               return false

User · Answer

To detect your controller is pushed or not just use below code in anywhere you want   if     self parentViewController childViewControllers  firstObject  isKindOfClass  self class              Not pushed   else           Pushed     I hope this code can help anyone

User · Answer

Swift 5 This handy extension handles few more cases than previous answers  These cases are VC view controller  is the root VC of app window  VC is added as child to parent VC  It tries to return true only if the viewcontroller is modally presented   extension UIViewController                 returns true only if the viewcontroller is presented             var isModal  Bool           if let index   navigationController  viewControllers firstIndex of  self   index  gt  0               return false           else if presentingViewController    nil               if let parent   parent    parent is UINavigationController    parent is UITabBarController                    return false                           return true           else if let navController   navigationController  navController presentingViewController  presentedViewController    navController               return true           else if tabBarController  presentingViewController is UITabBarController               return true                   return false           Thanks to Jonauz s answer  Again there is space for more optimizations  Please discuss about case that need to be handled in comment section

User · Answer

In Swift   Add a flag to test if it s a modal by the class type      MARK  - UIViewController implementation  extension UIViewController        var isModal  Bool            let presentingIsModal   presentingViewController    nil         let presentingIsNavigation   navigationController  presentingViewController  presentedViewController    navigationController         let presentingIsTabBar   tabBarController  presentingViewController is UITabBarController          return presentingIsModal    presentingIsNavigation    presentingIsTabBar

User · Answer

You overlooked one method  isBeingPresented   isBeingPresented is true when the view controller is being presented and false when being pushed   -  void viewWillAppear  BOOL animated        super viewWillAppear animated        if   self isBeingPresented                being presented       else if   self isMovingToParentViewController                being pushed       else              simply showing again because another VC was dismissed

[ios] How to check if a view controller is presented modally or pushed on a navigation stack?

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