Include an extension for a class only if iOS11 is available

Question

I am trying to extend a class written in Obj-C and include an extension written in Swift that makes it conform to the UIDropInteractionDelegate, like so:

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Answer 1

In ObjC, adding API_AVAILABLE(ios(11.0)) to end of the function definition will suppress the warning. Like this:

- (nullable UISwipeActionsConfiguration *)tableView:(UITableView *)tableView leadingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath API_AVAILABLE(ios(11.0))
{
     ... function implementation ...
}