Gesture recognizer and button actions

Question

I have a view hierarchy that looks something like this:

UIView (A)
UIView > UIImageView
UIView > UIView (B)
UIView > UIView (B) > Rounded Rect Button
UIView > UIView (B) > UIImageView
UIView > UIView (B) > UILabel

I've attached gesture recognizer(s) to my UIView (B). The problem that i'm facing is that i don't get any actions for the Rounded Rect Button which is inside the UIView (B). The singleTap gesture recognizer captures/overrides the button's Touch Up Inside event.

How can i make it work? I thought that the responder chain hierarchy will make sure that the button touch event will be given preference, and it WILL get triggered! What am i missing?

Here's some related code:

#pragma mark -
#pragma mark View lifecycle (Gesture recognizer setup)

- (void)viewDidLoad {
    [super viewDidLoad];

    // double tap gesture recognizer
    UITapGestureRecognizer *dtapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapGestureRecognizer:)];
    dtapGestureRecognize.delegate = self;
    dtapGestureRecognize.numberOfTapsRequired = 2;
    [self.viewB addGestureRecognizer:dtapGestureRecognize];

    // single tap gesture recognizer
    UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapGestureRecognizer:)];
    tapGestureRecognize.delegate = self;
    tapGestureRecognize.numberOfTapsRequired = 1;
    [tapGestureRecognize requireGestureRecognizerToFail:dtapGestureRecognize];
    [self.viewB addGestureRecognizer:tapGestureRecognize];

    // add gesture recodgnizer to the grid view to start the edit mode
    UILongPressGestureRecognizer *pahGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGestureRecognizerStateChanged:)];
    pahGestureRecognizer.delegate = self;
    pahGestureRecognizer.minimumPressDuration = 0.5;
    [self.viewB addGestureRecognizer:pahGestureRecognizer];

    [dtapGestureRecognize release];
    [tapGestureRecognize release];
    [pahGestureRecognizer release];
}

#pragma mark -
#pragma mark Button actions

- (IBAction)buttonTouchUpInside:(id)sender {
    NSLog(@"%s, %@", __FUNCTION__, sender);
}

#pragma mark -
#pragma mark Gesture recognizer actions


- (void)singleTapGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
    NSLog(@"%s", __FUNCTION__);
}

- (void)doubleTapGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
    NSLog(@"%s", __FUNCTION__);
}

- (void)longPressGestureRecognizerStateChanged:(UIGestureRecognizer *)gestureRecognizer {

    switch (gestureRecognizer.state) {

        case UIGestureRecognizerStateEnded: {
            NSLog(@"%s", __FUNCTION__);

            break;
        }
        default:
            break;
    }
}

The simplest way is to set cancelsTouchesInView = false – Bagusflyer Jun 02 '17 at 10:10 — Bagusflyer, Jun 02 '17 at 10:10

score 181 · Accepted Answer · edited Feb 26 '15 at 17:47

181

In the "shouldReceiveTouch" method you should add a condition that will return NO if the touch is in the button.

This is from apple SimpleGestureRecognizers example.

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    // Disallow recognition of tap gestures in the segmented control.
    if ((touch.view == yourButton)) {//change it to your condition
        return NO;
    }
    return YES;
}

hope it will help

Edit

As Daniel noted you must conform to UIGestureRecognizerDelegate for it to work.

shani

edited Feb 26 '15 at 17:47

Yuchen

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answered Jan 28 '11 at 05:49

shannoga

19,649
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169

1

Ah!!! Yes, i forgot about this -gestureRecognizer:shouldReceiveTouch: method. Thanks for pointing me in the right direction. Although this solves my problem, but i still don't know why the responder hierarchy is not working in this case. It probably should, but it's not being handled by Apple. – Mustafa Jan 28 '11 at 07:29
2

UIGestureRecognizer behavior is clearly described as separate from the "normal" responder chain. This is a design decision by Apple. – Sylvain G. Feb 17 '11 at 12:48
12

Remember to conform to the UIGestureRecognizerDelegate Protocol and set the UIGestureRecognizer's delegate to that object. – Daniel Feb 27 '12 at 14:46
2

For broader use, consider some variant on Ramesh's or flypig's test clauses. In my case, for example, I ended up with the line: `if ( [touch.view isKindOfClass:[UIControl class]] || [[touch.view superview] isKindOfClass:[UITableViewCell class]] ) {`... Note that tableview cells get "touched" in their contentView, which is a member of a private class, so there we check the superview's class instead. – clozach Sep 05 '12 at 06:58
Thank you for the answer! In my case, I ran into the same problem but I discovered it only until I tested in the actual device. Running the app in the simulator without using UIGestureDelegate as indicated in this answer worked as expected though incorrectly. – Luis Artola Mar 03 '13 at 07:17
can we detect direction within this method – Prince Kumar Sharma Jun 20 '13 at 16:03

score 51 · Answer 2 · edited Jul 26 '11 at 11:40

51

I also had the same problem , then i tried with

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{

    if ([touch.view isKindOfClass:[UIButton class]]) {      //change it to your condition
        return NO;
    }
    return YES;
}

It is working now perfectly.........

edited Jul 26 '11 at 11:40

forsvarir

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answered Jul 26 '11 at 05:53

Ramesh Chandran A

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4

i only missed the `myGestureRecognizer.delegate = self;` – zero3nna Jan 28 '13 at 14:15

score 20 · Answer 3 · answered Sep 04 '12 at 07:53

Generally speaking, we use below delegate method to avoid the touch in all kinds of UIControls:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if (([touch.view isKindOfClass:[UIControl class]])) {
         return NO;
    }
    return YES;
}

Note: DO NOT do this check (check the recognizer.view class type) the gestureRecognizerShouldBegin, it won't work.

score 11 · Answer 4 · answered Dec 07 '16 at 16:12

Here is a Swift 3.0 version:

extension UIViewController: UIGestureRecognizerDelegate {

public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    if touch.view is UIButton {
        return false
    }
    return true
}

Don't forget to:

Make your tapper object delegate to self (e.g: tapper.delegate = self)

score 6 · Answer 5 · answered Nov 10 '14 at 15:56

The best solution is to my mind using code snippet below:

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    CGPoint touchLocation = [touch locationInView:self.view];
    return !CGRectContainsPoint(self.menuButton.frame, touchLocation);
}

score 6 · Answer 6 · edited Dec 30 '15 at 05:46

6

Here is a Swift version:

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
    if (touch.view!.isKindOfClass(UIButton)) {
        return false
    }
    return true
}

Don't forget to:

Make you class conform to UIGestureRecognizerDelegate
Make your tapper object delegate to self (e.g: tapper.delegate = self)

edited Dec 30 '15 at 05:46

Mustafa

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answered Dec 28 '15 at 19:28

rsc

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score 1 · Answer 7 · answered Feb 13 '22 at 08:12

1

for Swift 5 inside the delegate you can just add:

return (touch.view is UIButton) ? false : true

answered Feb 13 '22 at 08:12

robinyapockets

363
5
21

Could be even simpler: `return !(touch.view is UIButton)` – Starsky Mar 10 '22 at 14:34
Even without the return! (If it's a one-liner) – Nicolas Frugoni Mar 25 '22 at 20:50

score 0 · Answer 8 · answered Dec 22 '21 at 04:42

0

Swift version of Vivienne answer:

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    let location = touch.location(in: view)
    return !someView.frame.contains(location)
}

answered Dec 22 '21 at 04:42

Eduard

191
10

Thibault · Answer 9 · 2022-02-16T10:32:10.357

My case was the following :

UIView (with tap gesture)
├-> UIView (named "textFieldView")
    ├-> UIControl
    ├-> UITextField
    ├-> UIView (over the textField, with a tap gesture)

╭──────────────────────────────╮
│ ╭──────────────────────────╮ │
│ │ ╭──╮  ┌╴╶╴╶╴╶╴╶╴╶╴╶╴╶╴╶┐ │ │
│ │ ╰──╯  └╴╶╴╶╴╶╴╶╴╶╴╶╴╶╴╶┘ │ │
│ ╰──────────────────────────╯ │
└──────────────────────────────┘

The tapGesture on the upper UIView was causing a conflict with the UIControl target. The target was called if the target was setup with touchDown (but not called for touchUpInside) or if I was changing the inheritance from UIControl to UIButton while keeping the target setup on event touchUpInside.

What I do to solve that is : upper view is setup as delegate of its tap gesture. Function func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool is implemented (in upper UIView) like that :

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    let touchLocationRelatedToTextFieldView = touch.location(in: textFieldView)
    return textFieldView.frame.contains(touchLocationRelatedToTextFieldView) == false
}

With that delegate function implemented I'm now able to keep my UIControl and the target setup on touchUpInside! :)

Gesture recognizer and button actions

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