UITapGestureRecognizer causes app to crash

Question

UITapGestureRecognizer causes app to crash when a swipe is done. Swipes done over very short distances do not cause any problems, but those done over a longer distance give the error :

 -[UITapRecognizer name]: unrecognized selector sent to instance 0x17ee27c0

where 0x17ee27c0 is a random value.

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITapRecognizer name]: unrecognized selector sent to instance 0x17ee27c0'
*** First throw call stack:
(0x2cb7dc1f 0x3a328c8b 0x2cb83039 0x2cb80f57 0x2cab2df8 0x2feee1c1 0x2d7d01cf 0x3024822d 0x300671ad 0x30066bcd 0x3003d3dd 0x302b0c29 0x3003be39 0x2cb44377 0x2cb43787 0x2cb41ded 0x2ca90211 0x2ca90023 0x33e890a9 0x3009c1d1 0xdca87 0x3a8a8aaf)
libc++abi.dylib: terminating with uncaught exception of type NSException

UITapRecognizer * (0x17ee27c0) is from tapGestureRecognizer._imp

This is happening on multiple devices running iOS 8.1 . The source is compiled on Xcode 6.

Here is how I declare the UITapGestureRecognizer:

UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)];
[myView addGestureRecognizer:tapGestureRecognizer];

And here is the method:

- (void)viewTapped:(UITapGestureRecognizer *)sender { }

The UITapGestureRecognizer is placed on a SKView;

Here is the stack trace: http://imageshack.com/a/img903/3622/X9QFX0.png

That was the way it was initially but I add it in an attempt to remove the error (I tried implenting gestureRecognizer:shouldReceiveTouch: ) but it didn't work. — Andrei Ardelean, Oct 28 '14 at 15:18
Here is the stack trace: http://imageshack.com/a/img674/6647/k76Dpi.png — Andrei Ardelean, Oct 28 '14 at 20:40
Where is the stack trace that was displayed in the console before the exception was rethrown? — Hot Licks, Oct 28 '14 at 20:44
@AndreiArdelean please [set an exception breakpoint](http://stackoverflow.com/a/17802723/74815) to get a useful stack. — i_am_jorf, Oct 28 '14 at 20:44
It should be noted that the error was on UITapRecognizer, not UITapGestureRecognizer. — Hot Licks, Oct 28 '14 at 20:52
This is the stack seen using a exception breakpoint : http://imageshack.com/a/img903/3622/X9QFX0.png — Andrei Ardelean, Oct 28 '14 at 21:00
It would be better if you copied that stack, in "code" form, into your question. That is how a question of this nature should be constructed from the start. — Hot Licks, Oct 29 '14 at 19:05
Your problem has to do with how you set up an SKNode. I'm not familiar with that stuff, though, so I can't hazard a guess what you may have done wrong. — Hot Licks, Oct 29 '14 at 19:09

score 1 · Answer 1 · answered Oct 29 '14 at 11:38

1

I had the same issue in one of my SpriteKit Games, it is caused when you use gestures during transition between scenes, i solved it by setting gestureRecognizer.enable property (documentation) to NO before the transition.

answered Oct 29 '14 at 11:38

Alexandr Elizarev

11
1
3

score 0 · Answer 2 · answered Oct 28 '14 at 20:43

0

you are trying to run a selector called name on a UITapGestureRecognizer instance, but UITapGestureRecognizer doesn't have such a selector and that's why your program is crashing. Check where you are calling name (probably inside viewTapped) and make sure you are applying it on the correct object.

answered Oct 28 '14 at 20:43

royherma

4,095
1
31
42

2

Or it's a zombie object. – i_am_jorf Oct 28 '14 at 20:45
1

I thought of that but there isn't a single method call to name in my hole project. And viewTapped isn't even called. – Andrei Ardelean Oct 28 '14 at 20:50
1

I also looked for zombies but it was in vain. – Andrei Ardelean Oct 28 '14 at 20:52
1

Actually, he's trying call `name` on a UITapRecognizer, which is an entirely different beast. – Hot Licks Oct 29 '14 at 21:25
@HotLicks this issue just is in ios 10 but in ios 13 is worked well, how solved in ios 10? i need use Name. – Jan 09 '20 at 14:27

score 0 · Answer 3 · answered Oct 29 '14 at 11:55

0

Are you sure ViewTapped: is expecting an argument.

answered Oct 29 '14 at 11:55

Win Coder

6,628
11
54
81

score 0 · Answer 4 · answered Jan 09 '20 at 18:34

you can use cast as example: action as MyTapGesture

var gestureRecognizer = new MyTapGesture((action) =>
            {
                myEvent(action as MyTapGesture);
            });
            gestureRecognizer.Name = name;

and the class MyTapGesture be reemplazed to UITapGestureRecognizer

using System;
using UIKit;

namespace ETracker.Libraries
{
    public class MyTapGesture: UITapGestureRecognizer
    {
        public string Name { get; set; }

        public MyTapGesture()
        {
        }

        public MyTapGesture(Action<UITapGestureRecognizer> action) : base(action)
        {
        }
    }
}

UITapGestureRecognizer causes app to crash

4 Answers4

Linked