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So I have a table view and I'd like the user to be able to swipe left to reveal a delete button, identically to how it works in the mail app. My issue is not that I can't get this to work - it does, I can swipe the row left, it reveals a delete button, and the user can click it to delete the cell (I do this by implementing editingStyleForRowAtIndexPath). My issue is that the swipe that is required is extremely insensitive. You have to swipe very fast and perfectly horizontally. It is not nearly as smooth as the swiping in mail. Is this just the way it is or am I overlooking something?
I thought maybe the views in the cell were blocking the swipe gesture somehow, but I went into the xib and set everything to hidden and it still is extremely difficult to swipe. The other thing I tried was to add my own swipe gesture recognizer to trigger the delete show. I tried adding it to the cell (that didn't work), to the table view (nope), and I also tried adding a clear colored UIView as a frontmost subview and putting it on that, but still no. Any ideas?
EDIT: I just created a new project to test the responsiveness of the editing style delete feature - very very simple table view just to see how it works. It is MUCH easier to swipe than the cell in my actual project. There aren't many differences between my test project and my actual one: actual loads a xib on cellForRowAtIndexPath while in test project it uses default styled cell, actual project has imageviews and uilabels within cell while test project is just a uilabel... what could be making it so unresponsive?
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When you want to handle deleting, you have to do three things: first, check that it's a delete that's happening and not an insert (this is down to how you use the UI); second, delete the item from the data source you used to build the table; and third, call deleteRows(at:) on your table view.
So, to remove a cell from a table view you first remove it from your data source, then you call deleteRows(at:) on your table view, providing it with an array of index paths that should be zapped. You can create index paths yourself, you just need a section and row number.
When a user slides horizontally across a row the editing style of the Tabel View Cell is set to delete. When the delete button is pressed, the item is deleted in the array and also the row is deleted in the Table View. Build and run the project and swipe-to-delete a row from the Table View.
It turns out there was a competing gesture recognizer hidden in a superclass I was completely oblivious to. Once I realized that, it was easily solved by disabling the other recognizer for that screen (although I believe there would be a more correct way of doing it by setting gesture recognizer priorities). Anyway, if you are having similar issues - really strange/ unexpected behavior from a UIGestureRecognizer - I would ensure there is no other gesture recognizer interfering.
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