When Keyboard is visible dragging produces an Exception

[benoit-pereira-da-silva]

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UICollectionViewUpdateItem action]: unrecognized selector sent to instance...

May be we should register for the key board notification or inject the action method using objc runtine (ex : http://stackoverflow.com/questions/12894172/deleting-cells-from-uicollectionview-via-nsnotification)

[lukescott]

I am familiar with this. I assume you have a field in your cells? This is an issue with iOS 6, and is fixed in iOS 7.

What does your patch actually do?

[benoit-pereira-da-silva]

My patch sets the LSCollectionViewHelper "enabled" property to false when the keyboard appears, and resets to its previous value when the keyboard hides. It is not very intrusive.

[benoit-pereira-da-silva]

My pull request fixes the IOS6.X crash + also corrects a very weird behaviour when using a collection view with an editable text on IOS7.

[lukescott]

Can you please go into more detail about the "weird behavior" in iOS 7?

For iOS 6, unfortunately the fix is to use the code in the SO answer. You'll find this can come up in other areas, and that preventing DraggableCollectionView from dragging isn't enough.

[benoit-pereira-da-silva]

The SO answer do not fix my case, it produces sort of a temporary cell. I haven't seen any issue with my fix on 6.X & 7.X even after extensive tests. And using a runtime selector injection is really not a recommended way.

[benoit-pereira-da-silva]

On IOS7 i have while dragging (keyboard opened) a secondary cell that appears.

[lukescott]

I'll do some research on this to see if I can fix the temporary cell problem. Unfortunately this runtime fix is necessary for iOS 6. If you try something like insertItemsAtIndexPaths: while the keyboard is up, you'll get the same crash.