I'm implementing a feature in my app that allows user to swipe/pan back to previous controller from anywhere on the screen. But the default swipe/pan back feature provided in navigation controller only works for the screen edge. How can I have it work from anywhere on the screen or how do I achieve something like 'full screen swipe/pan' back feature?
You can add swipe gesture to view of viewController like this
let recognizer: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(self.swipeToGoBack))
recognizer.direction = .right
self.view.addGestureRecognizer(recognizer)
#objc func swipeToGoBack(_ recognizer:UISwipeGestureRecognizer) {
// add code to dismiss this controller
}
I am building an app for that I have used MMDrawerController as my slide navigation controller.
I have gone through their documentation but did not find any code specific to gestures as such. Can you help me out over here.
Your can add UITapGestureRecognizer to navigationBar with UIGestureRecognizerDelegate of gesture in controller.
Overrive func gestureRecognizerShouldBegin, then calculator size than can executive tap gesture (ignore left, right bar item) -> Reture true
Custom title of navigationBar with:
navigationItem.titleView = otherView
and add action to this view
What I want to to: I want to drag down the whole view of a viewController to dismiss to the parent viewController using a pan gesture recognizer.
The Problem: When I drag the view down, the navigationBar decreases its height and does not look good. When the view returns to its original position, the navigationBar returns to the default size. I want the navigationBar to stay at its size. I also tried to use the new large titles and some other properties of the navigationController/-bar, but that did not solve it.
Note: Everything worked fine already before iOS 11.
My code:
override func viewDidLoad() {
super.viewDidLoad()
let panGesture = UIPanGestureRecognizer(target: self, action: #selector(dragViewDown(_:)))
navigationController!.view.addGestureRecognizer(panGesture)
}
#IBAction func dragViewDown(_ gesture: UIPanGestureRecognizer) {
if let dragView = gesture.view {
let translation = gesture.translation(in: dragView)
dragView.center.y = (dragView.center.y + translation.y)
gesture.setTranslation(CGPoint.zero, in: dragView)
}
}
This test project only has one viewController and does not provide the dismissal, but the problem is the same as in my working project.
I also uploaded the project to GitHub: https://github.com/maddinK7/navitationBar-pull-down-problem
Does anyone have an idea how to solve this? Thanks in advance.
I want the navigationBar to stay at its size
It is staying at its size. If you check the navigation bar's bounds size height before, during, and after the drag, you will see that it remains the same (probably 44) at all times. What's changing is the drawing extension that causes the drawing of the nav bar to extend up behind the status bar. It can't do that when you pull the whole thing away from the top of the screen, because it is not at the top next to the status bar any more. iOS 11 is more strict about the way it performs this drawing extension, probably because it has to do it in a special way on the iPhone X.
So, let's make sure you're doing this correctly:
Make sure that the navigation bar has a top constraint pinned to the safe area layout guide's top, with a constant of zero.
Make sure that the navigation bar has a delegate that returns .topAttached from position(forBar:).
If you are doing both those things and it doesn't help, you'll have to implement this in some other way entirely. Making the view directly draggable like this, without a custom parent view controller, was always dubious.
When UINavigationController attached top, system will add safe area top margin in the navigation background.
(NOTICE: Background margin will not changed when offset value is between 1 and 0)
So you have to handle attached/detached top event by handle gesture offset to change the right offset and content insets.
You can try the solution in my lib example. ;)
My example include UITableViewController in the UINavigationController, so it will relatively complex.
https://github.com/showang/OverlayModalViewController
Been looking around on here for a while but can't seem to find a working solution.
I'm trying to disable the swipe to go back to previous view gesture, in Swift.
I've tried a variety of solutions including:
self.navigationController?.interactivePopGestureRecognizer.enabled = false
and
self.navigationController.interactivePopGestureRecognizer.delegate = self
func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer!) -> Bool {
return false
}
Is there a new method of doing this or some other method that works?
The following is an easy approach to disabling & re-enabling the swipe back.
Swift 3.x & up
In a viewDidLoad/willAppear/didAppear method add:
navigationController?.interactivePopGestureRecognizer?.isEnabled = false
Just keep in mind that if you do it with viewDidLoad, then the next time you open the view, it may not be set depending upon whether or not it remains in your stack.
Unless you want it to remain off, you will need to turn it back on when the view is closed via either willMove(toParentViewController:) or willDisappear. Your navigationController will be nil at viewDidDisappear, so that is too late.
navigationController?.interactivePopGestureRecognizer?.isEnabled = true
A special note on SplitViewControllers:
As pointed out by CompC in the comments, you will need to call the second navigation controller to apply it to a detail view as such:
navigationController?.navigationController?.interactivePopGestureRecognizer?.isEnabled = false
Swift 2.2 & Objective-C
Swift versions 2.x & below:
navigationController?.interactivePopGestureRecognizer?.enabled
Objective-C:
self.navigationController.interactivePopGestureRecognizer.enabled
You could disable it but that would not be to recommended as most iOS users go back by swiping and less by pressing the back button.
If you want to disable it it would be more reasonable to use a modal segue instead of a push segue which is not that big of a transfer.
If you really want to get rid of the swipe to go back function I would just disable the back button and have a done button on the top right of the screen.
self.navigationController?.navigationItem.backBarButtonItem?.isEnabled = false;
I was able to do this by returning false in gestureRecognizerShouldBegin
class ViewController2: UIViewController, UIGestureRecognizerDelegate {
...
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.navigationController?.interactivePopGestureRecognizer.delegate = self
}
func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
return false
}
Add this line before pushing view controller to navigation controller
self.navigationController?.interactivePopGestureRecognizer?.isEnabled = false
Nothing wrong with either answer from Hari or Stefan but this is more succinct. Just put it in viewDidLoad and you're done.
if navigationController!.respondsToSelector(Selector("interactivePopGestureRecognizer")) {
navigationController!.view.removeGestureRecognizer(navigationController!.interactivePopGestureRecognizer)
}
EDIT:
One small caveat is that if the Navigation Controller was opened by another view and the Navigation Controller is closed then you'll get an EXC_BAD_ACCESS error. To fix it you have to save the original UIGestureRecognizer and put it back when you exit the view.
Declare:
private var popGesture: UIGestureRecognizer?
Immediately before removing the gesture:
popGesture = navigationController!.interactivePopGestureRecognizer
Then when closing the view:
If popGesture != nil {
navigationController!.view.addGestureRecognizer(popGesture!)
}
RowanPD's logic for Swift 4
private var popGesture: UIGestureRecognizer?
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
if navigationController!.responds(to: #selector(getter: UINavigationController.interactivePopGestureRecognizer)) {
self.popGesture = navigationController!.interactivePopGestureRecognizer
self.navigationController!.view.removeGestureRecognizer(navigationController!.interactivePopGestureRecognizer!)
}
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if let gesture = self.popGesture {
self.navigationController!.view.addGestureRecognizer(gesture)
}
}
Instead of
self.navigationController.pushViewController(VC, animated: Bool)
call
self.navigationController.setViewContollers([VC], animated: Bool)
setViewControllers replaces the all the VCs on the stack, instead of adding a new controller on top. This means that the new set VC is the root VC, and the user cannot go back.
This is most effective when you only want to disable the swipe on a single VC, and keep the swipe-to-back for the other VC.
If you want users to be able to go back, just not through swiping, do not use this method as it will disable all backs (as there is no VC to go back to).
for objective -c
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:true];
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
This is something you missed if it doesn't work after you tried all.
Add navigationController?.interactivePopGestureRecognizer?.isEnabled = false
to your viewWillAppear(animated:) method.
if it doesn't work, remove navigation delegate from the view controller. Check again if your view controller is confirming UINavigationControllerDelegate, UIGestureRecognizerDelegate protocols. if so, just remove it.
I generally make sure that swipe back is enabled in as many places as possible, even adding a custom gesture recognizer to add it to modal screens. However for an authentication and download process in my app I start the process with a modal navigation controller and then push the view for each next step. However, once it's completed I want to prevent them from backing up into the authentication screens.
For this scenario I've been using:
navigationController?.interactivePopGestureRecognizer?.isEnabled = false
navigationItem.hidesBackButton = true
in viewWillAppear() on the final screen. You can undo these in viewWillDisappear() if you're pushing another view and need them there.
Come here a little bit late. In my case self.navigationController?.navigationItem.backBarButtonItem?.isEnabled = false; not working. So I do this: you can present view controller instead of push view controller. This way the swipe back gesture will not apply to the view controller.
navigationController?.present(vc, animated: true)
You could use dismiss for your custom back button
self.dismiss(animated: true)
Note: You could set VC modal presentation style before present it to make sure it's full screen.
vc.modalPresentationStyle = .fullScreen
Hope this help.
If requirement is to show side menu on some of the screens then add AddScreenEdgePanGesture on this specific view instead of navigationController view
replace it
SideMenuManager.default.menuAddScreenEdgePanGesturesToPresent(toView: self.navigationController?.view)
with this
SideMenuManager.default.menuAddScreenEdgePanGesturesToPresent(toView: self.view)
Only complete removal of the gesture recognizer worked for me (from the presenting view controller).
if let navigationController = parent.navigationController,
let interactivePopGestureRecognizer = navigationController.interactivePopGestureRecognizer {
navigationController.view.removeGestureRecognizer(interactivePopGestureRecognizer)
}
Don't Use this if you don't want to come back, or you set the new rootViewController.
self.navigationController.pushViewController(VC, animated: Bool)
Use this
self.navigationController.setViewContollers([VC], animated: Bool)
setViewControllers Remove all the View Controllers on the stack then the user cannot go back. it will disable all backs
this worked for me
gesture(DragGesture(minimumDistance: 10, coordinateSpace: .global))
so minimum distance is the distance to which drag gesture start listening, setting to 0 removes any listening, but it will remove all interactions be aware, i have changed 0 to 10 to listen to tap gestures, but in your screen if you have any other interaction it will not work after adding this,
If you don't care about system back button appearance (for example, if you're using custom back button or navigation bar is hidden at all), it might help you:
navigationItem.hidesBackButton = true
It hides back button and disables swipe back gesture.
I have a navigation controller that pushes a view-controller (PARENT) that contains an UIPageViewController (PAGES). Now I used pan/swipe gestures to switch between the children of the page-view-controller. However, I can no longer pop the PARENT-view controller using the swipe gesture from the left border of the screen, because it is interpreted as a gesture in PAGES.
Is it possible to accomplish that swipe-to-pop when the left-most view-controller is shown?
Two ideas:
Return nil in pageViewController:viewControllerBeforeViewController -> doesn't work.
Restrict the touch area, as described here.
Or is there a more straightforward way?
I had the same situation as #smallwisdom, but handled it differently.
I have a view controller A that I push on top of my navigation controller's stack.
This view controller A contains a horizontal scroll view that stretches all the way from left side of the screen to the right.
In this scenario, when I wanted to swipe the screen to pop view controller A from navigation controller's stack, all I ended up doing was scrolling this horizontal scroll view.
The solution is pretty simple.
Inside my view controller A, I have code like this:
_contentScrollView = [[UIScrollView alloc] init];
[self.view addSubview:_contentScrollView];
for (UIGestureRecognizer *gestureRecognizer in _contentScrollView.gestureRecognizers) {
[gestureRecognizer requireGestureRecognizerToFail:self.navigationController.interactivePopGestureRecognizer];
}
It works great. What this does?
It is telling the scrollView's gesture recognizers that they have to wait to see if some other gesture recognizer will recognize the current gesture.
If that other fails to recognize, then they will no longer have to wait and they can try to recognize the current gesture.
If that other recognizer succeeds and recognizes the current gesture, then all of the gesture recognizers that have been waiting will automatically fail.
This other gesture recognizer they have to wait is set to be the navigation controller's interactivePopGestureRecognizer. He is in charge for the swipe-to-go-back gestures.
I mostly agree with #ancajic's answer. I would like to provide an extra-case when you set UIPageViewController's transitionStyle to 'Scroll', in which you'll not get gestureRecognizers to be set, the workaround is:
if (self.navigationController?.interactivePopGestureRecognizer != nil)
{
for view in self.pageViewController!.view.subviews
{
if let scrollView = view as? UIScrollView
{
scrollView.panGestureRecognizer.requireGestureRecognizerToFail(self.navigationController!.interactivePopGestureRecognizer!);
}
}
}
I had a similar issue in one of my projects and used the following method. In my case, it was one of those left-side menus that were really popular before iOS 7.
My solution was to set the UINavigationControllerDelegate and then implemented the following:
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animated {
// enable the interactive menu gesture only if at root, otherwise enable the pop gesture
BOOL isRoot = (navigationController.viewControllers.firstObject == viewController);
self.panGestureRecognizer.enabled = isRoot;
navigationController.interactivePopGestureRecognizer.enabled = !self.panGestureRecognizer.enabled;
}
EDIT:
Additionally, you need a hook into the UIPageViewController's gesture recognizers. (They aren't returned by the gestureRecognizers property for a scroll view style page view controller.) It's annoying, but the only way I've found to access this is to iterate through the scrollview's gesture recognizers and look for the pan gesture. Then set a pointer to it and enable/disable based on whether or not you are currently displaying the left-most view controller.
If you want to keep the right swipe enabled, then replace the pan gesture with a subclassed pan gesture recognizer of your own that can conditionally recognize based on the direction of the pan gesture.
First, find UIPageViewController's scrollView
extension UIPageViewController {
var bk_scrollView: UIScrollView? {
if let v = view as? UIScrollView {
return v
}
// view.subviews 只有一个元素，其类型是 _UIQueuingScrollView，是 UIScrollView 的子类
// view.subviews have only one item of which the type is _UIQueuingScrollView, which is kind of UIScrollView's subclass.
for v in view.subviews where v is UIScrollView {
return v as? UIScrollView
}
return nil
}
}
Second, set gestureRecognizer's dependence.
override func viewDidLoad() {
super.viewDidLoad()
if let ges = navigationController?.interactivePopGestureRecognizer {
pageViewController.bk_scrollView?.panGestureRecognizer.require(toFail: ges)
}
}
Swift version of #Lcsky's answer:
if let interactivePopGesture = self.navigationController?.interactivePopGestureRecognizer, let pageViewController = self.swipeVC?.pageViewController {
let subView = pageViewController.view.subviews
for view in subView {
if let scrollView = view as? UIScrollView{
scrollView.panGestureRecognizer.require(toFail: interactivePopGesture)
}
}
}