Just trying to make the navigationBar of my navigationController clickable.
It works well with
UITapGestureRecognizer* tapRecon = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(toggleMenu)];
tapRecon.delegate = self;
tapRecon.numberOfTapsRequired = 1;
[self.navigationBar addGestureRecognizer:tapRecon];
but when I have a back button, impossible to click on it (the gesture might take over the button).
So, I tried something found here :
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
return (![[[touch view] class] isSubclassOfClass:[UIButton class]]);
}
And nothing, because [touch view] is alway UINavigationBar...
Last thing i tried to do is setting the cancelsTouchesInView to NO. It's ok, we can click on the back button, but the toggleMenu action of the UITapGestureRecognizer is still called.
Do you have an idea to make the back button works again, but not calling toggleMenu at the same time ?
Thanks !
EDIT :
Juste found how to do :
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
for (UIView* sub in self.navigationBar.subviews) {
NSString *cl = NSStringFromClass([sub class]);
if ([cl isEqualToString:#"UINavigationItemButtonView"]) {
CGRect bback = sub.frame;
CGPoint pointInView = [touch locationInView:gestureRecognizer.view];
return !CGRectContainsPoint(bback, pointInView);
}
}
return YES;
}
Well you can make a button that surrounds the nav bar, and make another button for pressing back. Be sure to arrange it on top of the nav bar button in IB
This is a solution for Swift code:
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
for view in self.navigationBar.subviews {
if let button = view as? UIButton {
if touch.view.isEqual(button) {
return false
}
}
}
return true
}
Just put this in your delegate for your UIGestureRecognizer.
Related
I am trying to handle tableViewCell's being tapped, but the problem is that this is a "temporary tableView". I have it coded so that it will appear while the user is editing a UITextField, but then I set up a gesture recognizer to set the tableview to hidden as soon as the user clicks somewhere away from the UITextField.
I have the gesture recognizer set up as follows:
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:#selector(dismissKeyboard)];
[tap setCancelsTouchesInView:NO];
[self.view addGestureRecognizer:tap];
However, dismissKeyboard is called before didSelectRowAtIndexPath is called, and so the TableView that I want to handle the event on becomes hidden and therefore this function is never called.
My question is: Does anybody have ideas of how to get around this, so that didSelectRowAtIndexPath will execute before the tableView hides? I had one idea to somehow see if the tableView is where the tap is coming from, and if so, then don't execute the "hide tableView" line within dismissKeyboard. Is this possible?
Sorry, but I am new to iOS dev, so thank you for any advice!
You should be able to do this by making your view controller the tap gesture's delegate and denying it any touches that are inside the table view. Here is a starting point:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gesture shouldReceiveTouch:(UITouch *)touch
{
//Assuming your table view is a direct subview of the gesture recognizer's view
BOOL isInsideTableView = CGRectContainsPoint(tableView.frame, [touch locationInView:gesture.view])
if (isInsideTableView)
return NO;
return YES;
}
Hope this helps!
You could set yourself as a delegate to the UITapGestureRecognizer and cancel the gesture when the user taps within the tableView.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
//You can also (and should) check to make sure the gestureRecognizer is the tapGestureRecognizer
if (touch.view == tableView)
{
return NO;
}
else
{
return YES;
}
}
To better fit what you need, judge if your search bar is first responder.
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gesture shouldReceiveTouch:(UITouch *)touch
{
BOOL isInsideTableView = CGRectContainsPoint(yourTabelView.frame, [touch locationInView:gesture.view]);
if (isInsideTableView && ![yourSearchBar isFirstResponder])
return NO;
return YES;
}
I have a button, it works as usual on iOS 5 and 6. But on iOS 7 when I press the button the keyboard dismisses, but the method is not called. When I press it second time it works as intended.
Why is that?
Here is the code:
[self.loginButton addTarget:self action:#selector(loginButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
I have the button in UITableView cell.
EDIT:
Here is how I dismiss keyboard at the beginning of this method, but this method is not getting called o iOS7 until the second time I tap on the button.
for (UITextField *field in #[self.loginField, self.passwordField]) {
if ([field isFirstResponder]) {
[field resignFirstResponder];
}
}
I also have gesture recognizer to remove keyboard on tap outside:
UITapGestureRecognizer *tapper = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(removeKeyboard)];
[self.view addGestureRecognizer:tapper];
tapper.cancelsTouchesInView = NO;
Here is its method:
- (void) removeKeyboard
{
[self traverseAllSubviewsOfView:self.view withBlock:^(UIView *inView) {
[inView resignFirstResponder];
}];
}
Here is what helped me - I set controller as delegate for gesture recognizer and implement following method:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
// test if touch is on button
if ([touch.view isKindOfClass:[UIControl class]]) {
return NO;
}
return YES; // handle the touch
}
Did you check the cancelsTouchesInView property of the gesture recognizer? This property controls if touches are delivered to any underlying views. So settings this to NO should allow the touch to be sent to your button. More detail here.
This property can be set in code or in Interface Builder. You can set it in IB by highlighting the gesture recognizer and uncheck "Cancels Touches in View" (I think) in the Attributes Inspector.
I'm not in front of a Mac currently so I can't confirm the exact wording.
I have a UIPanGuestureRecognizer added to the entire view using this code:
UIPanGestureRecognizer *pgr = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(panAction:)];
[[self view] addGestureRecognizer:pgr];
Within the main view I have a UITableView which has this code to enable the swipe to delete feature:
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"RUNNING2");
return UITableViewCellEditingStyleDelete;
}
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row >= _firstEditableCell && _firstEditableCell != -1)
NSLog(#"RUNNING1");
return YES;
else
return NO;
}
Only RUNNING1 is printed to the log and the Delete button does not show up. I believe the reason for this is the UIPanGestureRecognizer, but I am not sure. If this is correct how should I go about fixing this. If this is not correct please provide the cause and fix. Thanks.
From the document:
If a gesture recognizer recognizes its gesture, the remaining touches for the view are cancelled.
Your UIPanGestureRecognizer recognizes the swipe gesture first, so your UITableView does not receive touches anymore.
To make the table view receives touch simultaneously with the gesture recognizer, add this to the gesture recognizer's delegate:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
If you are using UIPanGuestureRecognizer for example to show side menu you might see some unwanted side effects when you just return YES in all cases as proposed in accepted answer. For example the side menu opening when you scroll up/down the table view (with additional very little left/right direction) or delete button behaving strangely when you open the side menu. What you might want to do to prevent this side effects is to allow only simultaneous horizontal gestures. This will make the delete button work properly but at the same time other unwanted gestures will be blocked when you slide the menu.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
if ([otherGestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]])
{
UIPanGestureRecognizer *panGesture = (UIPanGestureRecognizer *)otherGestureRecognizer;
CGPoint velocity = [panGesture velocityInView:panGesture.view];
if (ABS(velocity.x) > ABS(velocity.y))
return YES;
}
return NO;
}
or in Swift:
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
guard let panRecognizer = otherGestureRecognizer as? UIPanGestureRecognizer else {
return false
}
let velocity = panRecognizer.velocity(in: panRecognizer.view)
if (abs(velocity.x) > abs(velocity.y)) {
return true
}
return false
}
If the accepted answer does not work. Try adding
panGestureRecognizer.cancelsTouchesInView = false
Ensure you haven't added the gesture to the tableview directly. I added a pan gesture on the ViewController view and can confirm it works.
I'm writing a module that everytime I swipe on a view, two sub views with a half size of the view will be added. Those subviews have their own gestures (eg: pan,...). The first time I swipe, it's OK because none of subview has been created. But once the subview been created, everytime I swipe, the swipe gesture is alway pass to its subviews. :(, so I have to swipe 2 times to divide.
I want to know is there any way to block swipe passing to its subview? Thank you.
UPDATE
I used shouldRecognizeSimultaneouslyWithGestureRecognizer to make those gestures work simultaneously. But there's still have some problems. The parent view have its Swipe gesture, the subview have its Pan gesture. Since I use souldRecognizeSimultaneouslyWithGestureRecognizer, sometime when I'm panning, the swipe gesture triggers. So, you know how to disable Swipe while Pan is active in this situation?
You have to implement the UIGestureRecognizerDelegate method:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
And add your controller as the delegate of the gesture recognizers. Then, when two gesture recognizers respond to a gesture, this method will be called and here you can implement the logic you want for your app.
In the interface declaration of the controller you have to type:
#interface testcViewController () <UIGestureRecognizerDelegate>
Then, when creating the gesture recognizer:
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(swipe)];
swipe.direction = UISwipeGestureRecognizerDirectionDown;
swipe.delegate = self;
[self.view addGestureRecognizer:swipe];
And then, finally, you add this method to the controller:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
BOOL shouldInteract = NO;
//Here you decide whether or not the two recognizers whould interact.
return shouldInteract;
}
EDIT
You can also implement
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;
And here, detect if you have already presented the subviews, and block any gesture you want.
To block all gesture recognizers from superviews I created a UIGestureRecognizer sub class that will do just that when attached to a view. See the following code (taken from my WEPopover project):
#import "WEBlockingGestureRecognizer.h"
#import <UIKit/UIGestureRecognizerSubclass.h>
#implementation WEBlockingGestureRecognizer
- (id)init {
return [self initWithTarget:self action:#selector(__dummyAction)];
}
- (id)initWithTarget:(id)target action:(SEL)action {
if ((self = [super initWithTarget:target action:action])) {
self.cancelsTouchesInView = NO;
}
return self;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
if (self.state == UIGestureRecognizerStatePossible) {
self.state = UIGestureRecognizerStateBegan;
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
self.state = UIGestureRecognizerStateRecognized;
}
- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventingGestureRecognizer {
return [self isGestureRecognizerAllowed:preventingGestureRecognizer];
}
- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer {
return ![self isGestureRecognizerAllowed:preventedGestureRecognizer];
}
- (BOOL)shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return ![self isGestureRecognizerAllowed:otherGestureRecognizer];
}
- (BOOL)shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return NO;
}
- (BOOL)isGestureRecognizerAllowed:(UIGestureRecognizer *)gr {
return [gr.view isDescendantOfView:self.view];
}
- (void)__dummyAction {
}
#end
If you want to block all gesture recognizers attached to parent views of some view, just do the following:
- (void)blockParentGesturesForView:(UIView *)v {
[v addGestureRecognizer:[WEBlockingGestureRecognizer new]];
}
set userinteractionEnabled to NO of your subView
subview.userinteractionEnabled=NO
if you dont want to disable userInteraction then use cancelsTouchesInView method
cancelsTouchesInView—If a gesture recognizer recognizes its gesture,
it unbinds the remaining touches of that gesture from their view (so
the window won’t deliver them). The window cancels the previously
delivered touches with a (touchesCancelled:withEvent:) message. If a
gesture recognizer doesn’t recognize its gesture, the view receives
all touches in the multi-touch sequence.
try like this,
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return NO;
}
Considering that I have a dialogView as a direct subview of my UIViewController's main view I'm attaching a gesture recognizer to the main view and do the following (setting my view controller as the gesture recognizer delegate):
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
let point = touch.location(in: view)
return !dialogView.frame.contains(point)
}
Took what I read here and made a Swift 5 that works great (for me)! I have a slide control in a view that also has a swipe recognizer for moving to another view. If the finger doesn't hit the slider's thumb, then the whole view moves.
By placing this view under the slider (expanded so its somewhat bigger), misses don't do anything.
final class BlockingView: UIView, UIGestureRecognizerDelegate {
let swipe: UISwipeGestureRecognizer = UISwipeGestureRecognizer();
init() {
super.init(frame: CGRect.zero)
swipe.direction = [.left, .right]
self.addGestureRecognizer(swipe)
}
required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
#objc override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool { return false }
}
Hope this saves someone the trouble!
I have a UIPageViewController load with my Viewcontroller.
The view controllers have buttons which are overridden by the PageViewControllers gesture recognizers.
For example I have a button on the right side of the viewcontroller and when you press the button, the PageViewController takes over and changes the page.
How can I make the button receive the touch and cancel the gesture recognizer in the PageViewController?
I think the PageViewController makes my ViewController a subview of its view.
I know I could turn off all of the Gestures, but this isn't the effect I'm looking for.
I would prefer not to subclass the PageViewController as apple says this class is not meant to be subclassed.
Here is another solution, which can be added in the viewDidLoad template right after the self.view.gestureRecognizers = self.pageViewController.gestureRecognizers part from the Xcode template. It avoids messing with the guts of the gesture recognizers or dealing with its delegates. It just removes the tap gesture recognizer from the views, leaving only the swipe recognizer.
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
// Find the tap gesture recognizer so we can remove it!
UIGestureRecognizer* tapRecognizer = nil;
for (UIGestureRecognizer* recognizer in self.pageViewController.gestureRecognizers) {
if ( [recognizer isKindOfClass:[UITapGestureRecognizer class]] ) {
tapRecognizer = recognizer;
break;
}
}
if ( tapRecognizer ) {
[self.view removeGestureRecognizer:tapRecognizer];
[self.pageViewController.view removeGestureRecognizer:tapRecognizer];
}
Now to switch between pages, you have to swipe. Taps now only work on your controls on top of the page view (which is what I was after).
You can override
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldReceiveTouch:(UITouch *)touch
to better control when the PageViewController should receive the touch and not. Look at "Preventing Gesture Recognizers from Analyzing Touches" in Dev API Gesture Recognizers
My solution looks like this in the RootViewController for the UIPageViewController:
In viewDidLoad:
//EDITED Need to take care of all gestureRecogizers. Got a bug when only setting the delegate for Tap
for (UIGestureRecognizer *gR in self.view.gestureRecognizers) {
gR.delegate = self;
}
The override:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
//Touch gestures below top bar should not make the page turn.
//EDITED Check for only Tap here instead.
if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
CGPoint touchPoint = [touch locationInView:self.view];
if (touchPoint.y > 40) {
return NO;
}
else if (touchPoint.x > 50 && touchPoint.x < 430) {//Let the buttons in the middle of the top bar receive the touch
return NO;
}
}
return YES;
}
And don't forget to set the RootViewController as UIGestureRecognizerDelegate.
(FYI, I'm only in Landscape mode.)
EDIT - The above code translated into Swift 2:
In viewDidLoad:
for gr in self.view.gestureRecognizers! {
gr.delegate = self
}
Make the page view controller inherit UIGestureRecognizerDelegate then add:
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
if let _ = gestureRecognizer as? UITapGestureRecognizer {
let touchPoint = touch .locationInView(self.view)
if (touchPoint.y > 40 ){
return false
}else{
return true
}
}
return true
}
I had the same problem. The sample and documentation does this in loadView or viewDidLoad:
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
This replaces the gesture recognizers from the UIViewControllers views with the gestureRecognizers of the UIPageViewController. Now when a touch occurs, they are first sent through the pageViewControllers gesture recognizers - if they do not match, they are sent to the subviews.
Just uncomment that line, and everything is working as expected.
Phillip
Setting the gestureRecognizers delegate to a viewController as below no longer work on ios6
for (UIGestureRecognizer *gR in self.view.gestureRecognizers) {
gR.delegate = self;
}
In ios6, setting your pageViewController's gestureRecognizers delegate to a viewController causes a crash
In newer versions (I am in Xcode 7.3 targeting iOS 8.1+), none of these solutions seem to work.
The accepted answer would crash with error:
UIScrollView's built-in pan gesture recognizer must have its scroll view as its delegate.
The currently highest ranking answer (from Pat McG) no longer works as well because UIPageViewController's scrollview seems to be using odd gesture recognizer sub classes that you can't check for. Therefore, the statement if ( [recognizer isKindOfClass:[UITapGestureRecognizer class]] ) never executes.
I chose to just set cancelsTouchesInView on each recognizer to false, which allows subviews of the UIPageViewController to receive touches as well.
In viewDidLoad:
guard let recognizers = self.pageViewController.view.subviews[0].gestureRecognizers else {
print("No gesture recognizers on scrollview.")
return
}
for recognizer in recognizers {
recognizer.cancelsTouchesInView = false
}
I used
for (UIScrollView *view in _pageViewController.view.subviews) {
if ([view isKindOfClass:[UIScrollView class]]) {
view.delaysContentTouches = NO;
}
}
to allow clicks to go through to buttons inside a UIPageViewController
In my case I wanted to disable tapping on the UIPageControl and let tapping being received by another button on the screen. Swipe still works. I have tried numerous ways and I believe that was the simplest working solution:
for (UIPageControl *view in _pageController.view.subviews) {
if ([view isKindOfClass:[UIPageControl class]]) {
view.enabled = NO;
}
}
This is getting the UIPageControl view from the UIPageController subviews and disabling user interaction.
Just create a subview (linked to a new IBOutlet gesturesView) in your RootViewController and assign the gestures to this new view. This view cover the part of the screen you want the gesture enable.
in viewDidLoad change :
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
to :
self.gesturesView.gestureRecognizers = self.pageViewController.gestureRecognizers;
If you're using a button that you've subclassed, you could override touchesBegan, touchesMoved, and touchesEnded, invoking your own programmatic page turn as appropriate but not calling super and passing the touches up the notification chain.
Also can use this (thanks for help, with say about delegate):
// add UIGestureRecognizerDelegate
NSPredicate *tp = [NSPredicate predicateWithFormat:#"self isKindOfClass: %#", [UITapGestureRecognizer class]];
UITapGestureRecognizer *tgr = (UITapGestureRecognizer *)[self.pageViewController.view.gestureRecognizers filteredArrayUsingPredicate:tp][0];
tgr.delegate = self; // tap delegating
NSPredicate *pp = [NSPredicate predicateWithFormat:#"self isKindOfClass: %#", [UIPanGestureRecognizer class]];
UIPanGestureRecognizer *pgr = (UIPanGestureRecognizer *)[self.pageViewController.view.gestureRecognizers filteredArrayUsingPredicate:pp][0];
pgr.delegate = self; // pan delegating
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
CGPoint touchPoint = [touch locationInView:self.view];
if (UIInterfaceOrientationIsPortrait([[UIApplication sharedApplication] statusBarOrientation]) && touchPoint.y > 915 ) {
return NO; // if y > 915 px in portrait mode
}
if (UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation]) && touchPoint.y > 680 ) {
return NO; // if y > 680 px in landscape mode
}
return YES;
}
Work perfectly for me :)
This is the solution which worked best for me I tried JRAMER answer with was fine except I would get an Error when paging beyond the bounds (page -1 or page 23 for me)
PatMCG solution did not give me enough flexibility since it cancelled all the taprecognizers, I still wanted the tap but not within my label
In my UILabel I simply overrode as follows, this cancelled tap for my label only
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
return NO;
} else {
return YES;
}
}
I create pageviewcontrollers regularly as my user jumps, curls, and slides to various different page views. In the routine that creates a new pageviewcontroller, I use a slightly simpler version of the excellent code shown above:
UIPageViewController *npVC = [[UIPageViewController alloc]
initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
options: options];
...
// Find the pageView tap gesture recognizer so we can remove it!
for (UIGestureRecognizer* recognizer in npVC.gestureRecognizers) {
if ( [recognizer isKindOfClass:[UITapGestureRecognizer class]] ) {
UIGestureRecognizer* tapRecognizer = recognizer;
[npVC.view removeGestureRecognizer:tapRecognizer];
break;
}
}
Now the taps work as I wish (with left and right taps jumping a page, and the curls work fine.
Swift 3 extension for removing tap recognizer:
import UIKit
extension UIPageViewController {
func removeTapRecognizer() {
let gestureRecognizers = self.gestureRecognizers
var tapGesture: UIGestureRecognizer?
gestureRecognizers.forEach { recognizer in
if recognizer.isKind(of: UITapGestureRecognizer.self) {
tapGesture = recognizer
}
}
if let tapGesture = tapGesture {
self.view.removeGestureRecognizer(tapGesture)
}
}
}
I ended up here while looking for a simple, catch-all way to respond to taps on my child view controllers within a UIPageViewController. The core of my solution (Swift 4, Xcode 9) wound up being as simple as this, in my RootViewController.swift (same structure as Xcode's "Page-Based App" template):
override func viewDidLoad() {
super.viewDidLoad()
...
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(pageTapped(sender:)))
self.pageViewController?.view.subviews[0].addGestureRecognizer(tapGesture)
}
...
#objc func pageTapped(sender: UITapGestureRecognizer) {
print("pageTapped")
}
(I also made use of this answer to let me keep track of which page was actually tapped, ie. the current one.)
I worked out a working solution.
Add another UIGestureRecognizer to UIPageViewController and implement delegate method provided below.
In every moment that you have to resolve which gesture should be locked or passed further this method will be called. Remember to provide a reference to confictingView, which in my case it was UITableView, which also recognizes pan gesture. This view was placed inside UIPageViewController, so a pan gesture was recognized twice or just in randomly way. Now in this method, I check if pan gesture is inside both my UITableView and UIPageViewController, and I decide that UIPanGestureRecognizer is primary.
This approach doesn't override directly any of another gesture recognizers so we don't have to worry about mentioned 'NSInvalidArgumentException'.
Keep in mind that pattern actually is not approved by Apple :)
var conflictingView:UIView?
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
if otherGestureRecognizer.view === pageViewController?.view {
if let view = conflictingView {
var point = otherGestureRecognizer.location(in: self.view)
if view.frame.contains(point) {
print("Touch in conflicting view")
return false
}
}
print("Touch outside conficting view")
return true
}
print("Another view passed out")
return true
}