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

IosObjective CUinavigationcontrollerUinavigationbarUinavigationitem

Ios Problem Overview

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!

Ios Solutions

Solution 1 - Ios

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.

Solution 2 - Ios

You need to handle two scenarios:

  1. When you're pushing a new view onto the stack
  2. 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) -> 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 > 1 && 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

Solution 3 - Ios

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;
}

Solution 4 - Ios

it works for me Swift 3:

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

and in ViewDidLoad:

    self.navigationController?.interactivePopGestureRecognizer?.delegate = self
    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true

Solution 5 - Ios

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) -> 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;
} }

Solution 6 - Ios

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
}

Solution 7 - Ios

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) -> Bool {
        return viewControllers.count > 1
    }
}

Above code helps in swift left to go back to previous controller like Facebook, Twitter.

Solution 8 - Ios

Swift 3:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    
    self.navigationController?.interactivePopGestureRecognizer?.delegate = self
}

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return (otherGestureRecognizer is UIScreenEdgePanGestureRecognizer)
}

Solution 9 - Ios

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) -> Bool {
        return viewControllers.count > 1
    }

}

Now, whenever you use QFNavigationController you get the desired experience.

Solution 10 - Ios

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

Solution 11 - Ios

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
}

Solution 12 - Ios

I've created the following Swift 5+ UIViewController extension to make it easier to add/remove the interactive pop gesture on each screen that you need it on.

Note:

  • Add enableInteractivePopGesture() on each screen that has your custom back button

  • Add disableInteractivePopGesture() on viewDidAppear for root screen of your navigation controller to prevent the swipe back issue some of the answers here mention

  • Also add disableInteractivePopGesture() on pushed screens that you don't want to have the back button and swipe back gesture

    extension UIViewController: UIGestureRecognizerDelegate {

  func disableInteractivePopGesture() {
    navigationItem.hidesBackButton = true
    navigationController?.interactivePopGestureRecognizer?.delegate = self
    navigationController?.interactivePopGestureRecognizer?.isEnabled = false
  }

  func enableInteractivePopGesture() {
    navigationController?.interactivePopGestureRecognizer?.delegate = self
    navigationController?.interactivePopGestureRecognizer?.isEnabled = true
  }
}

Solution 13 - Ios

We're all working around some old bugs that haven't been fixed likely because it's "by design." 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.

Solution 14 - Ios

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.

Image displaying the property that out to be set

Solution 15 - Ios

Swift 5, add only these two in viewDidLoad method:

override func viewDidLoad() {
    super.viewDidLoad()

    navigationController?.interactivePopGestureRecognizer?.delegate = self
    navigationController?.interactivePopGestureRecognizer?.isEnabled = true
}

Solution 16 - Ios

I was having issue to enable and disable swipe interaction to pop viewcontrollers.

I have a base navigation controller and my app flow is like push Splash VC, push Main VC, and then push Some VC like that.

I want swipe to go back from Some VC to Main VC. Also disable swipe to prevent going back to splash from main VC.

After some tryings below works for me.

  1. Write an extension in Main VC to disable swipe
extension MainViewController : UIGestureRecognizerDelegate{
    
    func disableSwipeToPop() {
        self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
        self.navigationController?.interactivePopGestureRecognizer?.delegate = self
    }
    
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        
        if gestureRecognizer == self.navigationController?.interactivePopGestureRecognizer {
            return false
        }
        return true
    }
}
  1. Call disableSwipeToPop() method on viewDidAppear of Main VC
override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        self.disableSwipeToPop()
}
  1. Write an extension in Some VC to enable swipe to pop Some VC
extension SomeViewController{
    
    func enableSwipeToPop() {
        self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
        self.navigationController?.interactivePopGestureRecognizer?.delegate = nil
    }
    
}
  1. Call enableSwipeToPop() method on viewDidLoad of Some VC
override func viewDidLoad() {
        super.viewDidLoad()
        self.enableSwipeToPop()
}

That's it. Also if you try to disable swipe on viewWillAppear, you may loose the ability to swipe again when user stops swiping to cancel the action.

Solution 17 - Ios

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.

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