How can a UIViewController inside a UIPageController get touch events? - objective-c

Question

It seems that the button simply doesn't get pressed.
I tried:
UIPageViewController Gesture recognizers
However, here is the catch
if page transition of UIPageViewController is UIPageViewControllerTransitionStyleScroll then
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
NSLog(#"%#",self.pageViewController.gestureRecognizers.description);
NSLog(#"%#",self.pageViewController.gestureRecognizers.description);
will simply be empty.
I tried adding my own gestureRecoqnizers instead of button into the UIViewControllers's subview. It still doesn't work.
So I have a UIPageViewController that display a UIViewController whose view has some button. How do I get that button pressed?
I also tried both solutions here:
http://emlyn.net/posts/stopping-gesture-recognizers-in-their-tracks
None works. First of all I cannot disable gesture recoqnizers of the UIPageViewController because there is no such thing. In scrollView mode, UIPageViewController doesn't have gesture recoqnizers.
I tried to add my own gesture recoqnizers to my own button but those are never called.
I want the UIPageViewController to still handle swipe though. But not tap.
I can't access the gesture recoqnizers of UIPageViewControllers because self.pageViewController.gestureRecognizers is empty. The UIPageViewController seems to just "absorb" all tap events. So my button doesn't get it.
I can add button in front of UIPageViewController but that button will absorb the swiping action which I want UIPageVIewController to still handle.
By the way if we uses the template from IOS (Create a page based app, and change the transition to scroll the pageviewcontroller.gesturerecoqnizers will be empty
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Configure the page view controller and add it as a child view controller.
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];//Turn this to scroll view
self.pageViewController.delegate = self;
SDDataViewController *startingViewController = [self.modelController viewControllerAtIndex:0 storyboard:self.storyboard];
NSArray *viewControllers = #[startingViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:NULL];
self.pageViewController.dataSource = self.modelController;
[self addChildViewController:self.pageViewController];
[self.view addSubview:self.pageViewController.view];
// Set the page view controller's bounds using an inset rect so that self's view is visible around the edges of the pages.
CGRect pageViewRect = self.view.bounds;
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
pageViewRect = CGRectInset(pageViewRect, 40.0, 40.0);
}
self.pageViewController.view.frame = pageViewRect;
[self.pageViewController didMoveToParentViewController:self];
// Add the page view controller's gesture recognizers to the book view controller's view so that the gestures are started more easily.
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
NSLog(#"%#",self.pageViewController.gestureRecognizers.description); //This is empty
while (false);
}

Answer 1

Maybe you can set up a custom gesture recognizer in your UIPageViewController. This way, you will be able to filter through UITouch Events, by implementing this in your gesture recognizer delegate (the one for your UIPageViewController) :
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gesture shouldReceiveTouch:(UITouch *)touch {
if (touch.tapCount > 1) { // It will ignore touch with less than two finger
return YES;
}
return NO;
}
This, you will tell the UIPageViewController gestureRecognizer to not care about touch with one finger. You'll have to try it, but i think it might do the trick. The problem here is you have to ask your user for a two-finger swipe...
Check here for an other answer