How to enable back left swipe gesture in UINavigationController after setting leftBarButtonItem

Question

I got the opposite issue from here  By default in iOS7  back swipe gesture of UINavigationController s stack could pop the presented ViewController  Now I just uniformed all the self navigationItem leftBarButtonItem style for all the ViewControllers   Here is the code   self navigationItem leftBarButtonItem     UIBarButtonItem alloc  initWithImage LOADIMAGE   back button   style UIBarButtonItemStylePlain target self action  selector popCurrentViewController      after that  the navigationController interactivePopGestureRecognizer is disabled  How could I make the pop gesture enabled without removing the custom leftBarButtonItem   Thanks

User · Answer

It works for me when I set the delegate

self.navigationController.interactivePopGestureRecognizer.delegate = self;

and then implement

Swift

extension MyViewController:UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}

Objective-C

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

User · Answer

This answer  but with storyboard support   class SwipeNavigationController  UINavigationController           MARK  - Lifecycle      override init rootViewController  UIViewController            super init rootViewController  rootViewController             override init nibName nibNameOrNil  String   bundle nibBundleOrNil  Bundle             super init nibName  nibNameOrNil  bundle  nibBundleOrNil           self setup              required init  coder aDecoder  NSCoder            super init coder  aDecoder           self setup              private func setup             delegate   self            override func viewDidLoad             super viewDidLoad               This needs to be in here  not in init         interactivePopGestureRecognizer  delegate   self            deinit           delegate   nil         interactivePopGestureRecognizer  delegate   nil               MARK  - Overrides      override func pushViewController   viewController  UIViewController  animated  Bool            duringPushAnimation   true          super pushViewController viewController  animated  animated                MARK  - Private Properties      fileprivate var duringPushAnimation   false

User · Answer

We re all working around some old bugs that haven t been fixed likely because it s  quot by design  quot  I ran into the freezing problem  iwasrobbed described elsewhere when trying to nil the interactivePopGestureRecognizer s delegate which seemed like it should ve worked  If you want swipe behavior reconsider using backBarButtonItem which you can customize  I also ran into interactivePopGestureRecognizer not working when the UINavigationBar is hidden  If hiding the navigation bar is a concern for you  reconsider your design before implementing a workaround for a bug

User · Answer

If you want this behaviour everywhere in your app and don t want to add anything to individual viewDidAppear etc  then you should create a subclass  class QFNavigationController UINavigationController  UIGestureRecognizerDelegate  UINavigationControllerDelegate      override func viewDidLoad             super viewDidLoad           interactivePopGestureRecognizer  delegate   self         delegate   self            override func pushViewController   viewController  UIViewController  animated  Bool            super pushViewController viewController  animated  animated          interactivePopGestureRecognizer  isEnabled   false            func navigationController   navigationController  UINavigationController  didShow viewController  UIViewController  animated  Bool            interactivePopGestureRecognizer  isEnabled   true               IMPORTANT  without this if you attempt swipe on        first view controller you may be unable to push the next one     func gestureRecognizerShouldBegin   gestureRecognizer  UIGestureRecognizer  - gt  Bool           return viewControllers count  gt  1            Now  whenever you use QFNavigationController you get the desired experience

User · Answer

Most answers are pertaining to doing it on code  But I ll give you one that works on Storyboard  Yes  You read it right   Click on main UINavigationController and navigate to it s Identity Inspector tab   Under User Defined Runtime Attributes  set a single runtime property called interactivePopGestureRecognizer enabled to true  Or graphically  you d have to enable the checkbox as shown in the image below    That s it  You re good to go  Your back gesture will work as if it was there all along

User · Answer

I did not need to add gestureRecognizer functions for it  It was enough for me to add following code blocks at viewDidLoad   override func viewDidLoad         super viewDidLoad       self navigationController  interactivePopGestureRecognizer  delegate   nil     self navigationController  interactivePopGestureRecognizer  isEnabled   true

User · Answer

In Swift you can do the following code  import UIKit extension UINavigationController  UIGestureRecognizerDelegate        open override func viewDidLoad             super viewDidLoad           interactivePopGestureRecognizer  delegate   self            public func gestureRecognizerShouldBegin   gestureRecognizer  UIGestureRecognizer  - gt  Bool           return viewControllers count  gt  1           Above code helps in swift left to go back to previous controller like Facebook  Twitter

User · Answer

Setting a custom back button disable the swipe back feature   The best thing to do to keep it is to subclass UINavigationViewController and set itself as the interactivePopGestureRecognizer delegate  then you can return YES from gestureRecognizerShouldBegin to allow the swipe back   For example  this is done in AHKNavigationController  And a Swift version here  https   stackoverflow com a 43433530 308315

User · Answer

You need to handle two scenarios   When you re pushing a new view onto the stack When you re showing the root view controller  If you just need a base class you can use  here s a Swift 3 version  import UIKit  final class SwipeNavigationController  UINavigationController               MARK  - Lifecycle          override init rootViewController  UIViewController            super init rootViewController  rootViewController            delegate   self                override init nibName nibNameOrNil  String   bundle nibBundleOrNil  Bundle             super init nibName  nibNameOrNil  bundle  nibBundleOrNil                   delegate   self            required init  coder aDecoder  NSCoder             super init coder  aDecoder            delegate   self                 override func viewDidLoad             super viewDidLoad                       This needs to be in here  not in init         interactivePopGestureRecognizer  delegate   self                deinit           delegate   nil         interactivePopGestureRecognizer  delegate   nil                   MARK  - Overrides          override func pushViewController   viewController  UIViewController  animated  Bool            duringPushAnimation   true                  super pushViewController viewController  animated  animated                    MARK  - Private Properties          fileprivate var duringPushAnimation   false        MARK  - UINavigationControllerDelegate  extension SwipeNavigationController  UINavigationControllerDelegate            func navigationController   navigationController  UINavigationController  didShow viewController  UIViewController  animated  Bool            guard let swipeNavigationController   navigationController as  SwipeNavigationController else   return                    swipeNavigationController duringPushAnimation   false                  MARK  - UIGestureRecognizerDelegate  extension SwipeNavigationController  UIGestureRecognizerDelegate            func gestureRecognizerShouldBegin   gestureRecognizer  UIGestureRecognizer  - gt  Bool           guard gestureRecognizer    interactivePopGestureRecognizer else               return true    default value                               Disable pop gesture in two situations             1  when the pop animation is in progress            2  when user swipes quickly a couple of times and animations don t have time to be performed         return viewControllers count  gt  1  amp  amp  duringPushAnimation    false          If you end up needing to act as a UINavigationControllerDelegate in another class  you can write a delegate forwarder similar to this answer  Adapted from source in Objective-C  https   github com fastred AHKNavigationController

User · Answer

For those who are still having trouble with this  try separating the two lines as below   override func viewDidLoad         self navigationController  interactivePopGestureRecognizer  delegate   self          override func viewWillAppear   animated  Bool        self navigationController  interactivePopGestureRecognizer  isEnabled   true           Obviously  in my app      interactivePopGestureRecognizer  isEnabled   got reset to false before the view was shown for some reason

User · Answer

it works for me Swift 3       func gestureRecognizer   gestureRecognizer  UIGestureRecognizer  shouldBeRequiredToFailBy otherGestureRecognizer  UIGestureRecognizer  - gt  Bool           return true         and in ViewDidLoad       self navigationController  interactivePopGestureRecognizer  delegate   self     self navigationController  interactivePopGestureRecognizer  isEnabled   true

User · Answer

This is the best way to enable  disable swipe to pop view controller in iOS 10  Swift 3    For First Screen   Where you want to Disable Swipe gesture       class SignUpViewController   UIViewController UIGestureRecognizerDelegate      MARK  - View initializers override func viewDidLoad         super viewDidLoad      override func viewWillAppear   animated  Bool        super viewWillAppear animated      swipeToPop      override func viewWillDisappear   animated  Bool        super viewWillDisappear animated     override func didReceiveMemoryWarning         super didReceiveMemoryWarning      func swipeToPop          self navigationController  interactivePopGestureRecognizer  isEnabled   true      self navigationController  interactivePopGestureRecognizer  delegate   self     func gestureRecognizerShouldBegin   gestureRecognizer  UIGestureRecognizer  - gt  Bool        if gestureRecognizer    self navigationController  interactivePopGestureRecognizer           return false           return true       For middle screen   Where you want to Enable Swipe gesture      class FriendListViewController   UIViewController      MARK  - View initializers override func viewDidLoad          super viewDidLoad       swipeToPop      func swipeToPop          self navigationController  interactivePopGestureRecognizer  isEnabled   true      self navigationController  interactivePopGestureRecognizer  delegate   nil

User · Answer

First set delegate in viewDidLoad   self navigationController interactivePopGestureRecognizer delegate   self    And then disable gesture when pushing   -  void pushViewController  UIViewController   viewController animated  BOOL animated        super pushViewController viewController animated animated       self interactivePopGestureRecognizer enabled   NO      And enable in viewDidDisappear   self navigationController interactivePopGestureRecognizer enabled   YES    Also  add UINavigationControllerDelegate to your view controller

User · Answer

Swift 3   override func viewWillAppear   animated  Bool        super viewWillAppear animated       self navigationController  interactivePopGestureRecognizer  delegate   self    func gestureRecognizer   gestureRecognizer  UIGestureRecognizer  shouldRecognizeSimultaneouslyWith otherGestureRecognizer  UIGestureRecognizer  - gt  Bool       return true    func gestureRecognizer   gestureRecognizer  UIGestureRecognizer  shouldRequireFailureOf otherGestureRecognizer  UIGestureRecognizer  - gt  Bool       return  otherGestureRecognizer is UIScreenEdgePanGestureRecognizer

[ios] How to enable back/left swipe gesture in UINavigationController after setting leftBarButtonItem?

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