CODEWITHSUNDEEP
objective-ccrashuitapgesturerecognizerswipe-gesture
Andrei Ardelean
Andrei Ardelean

Reputation: 484

UITapGestureRecognizer causes app to crash

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

Upvotes: 1

Views: 1334

Answers (4)

user7396942
user7396942

Reputation:

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)
        {
        }
    }
}

Upvotes: 0

Win Coder
Win Coder

Reputation: 6756

Are you sure ViewTapped: is expecting an argument.

Upvotes: 0

Alexandr Elizarev
Alexandr Elizarev

Reputation: 11

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.

Upvotes: 1

royherma
royherma

Reputation: 4203

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.

Upvotes: 0

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