For UITableView do I need to implement trailingSwipeActionsConfigurationForRowAt and/or editActionsForRowAt?

According to your requirement:

I want actions for rows, but I don't want the default behaviour in iOS11 of performsFirstActionWithFullSwipe. If I just implement editActionsForRowAt then iOS11 does the full swipe.

In iOS-10 and below,

to get the edit actions work in a UITableView, just implement the below methods:

func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool
{
    return true
}

func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]?
{
    let deleteAction = UITableViewRowAction(style: .destructive, title: "Delete") { (action, indexpath) in
        //YOUR_CODE_HERE
    }
    deleteAction.backgroundColor = .red
    return [deleteAction]
}

In iOS-11,

2 new methods were introduced to support editing in a UITableView, i.e. leadingSwipeActionsConfigurationForRowAt and trailingSwipeActionsConfigurationForRowAt.

According to Apple,

Swipe actions

These methods supersede -editActionsForRowAtIndexPath: if implemented

return nil to get the default swipe actions

So, you can implement these 2 methods to get the iOS-11 specific behaviour. Even if you don't editActionsForRowAt will be called.

If you don't want the default full swipe behaviour of edit action in iOS-11, just set performsFirstActionWithFullSwipe to false.

Example:

@available(iOS 11.0, *)
func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration?
{
    return nil
}

@available(iOS 11.0, *)
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration?
{
    let deleteAction = UIContextualAction(style: .destructive, title: "Delete") { (action, view, handler) in
        //YOUR_CODE_HERE
    }
    deleteAction.backgroundColor = .red
    let configuration = UISwipeActionsConfiguration(actions: [deleteAction])
    configuration.performsFirstActionWithFullSwipe = false
    return configuration
}

Let me know if you still face any issues.

If you want some form of row actions, you need to:

Implement just editActionsForRowAt and it will work for iOS 10, 11, 12 and 13. But it's NOT available in iOS 14 (or newer).

or:

Implement editActionsForRowAt on iOS 10, and implement the trailing/swiping methods on iOS 11 or newer - which are slightly fancier.

or:

Ignore iOS 10 and only support iOS 11 or newer trailing/swiping actions since most of your customers will likely be running iOS 11 anyway - and row actions are generally considered an optional feature anyway.

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If you don't want the full swipe behavior, you can only achieve this on iOS 11 or newer where you can set performsFirstActionWithFullSwipe to false

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Full swipe methods aren't available until iOS 11. They won't work in iOS 10.