You scheduled DispatchQueue.main.asyncAfter(deadline: .now() + 2) { showTooltip() }, and if the user leaves the screen within 2 seconds it has to be canceled. How would you do that with GCD?
Wrap the closure in a DispatchWorkItem, pass it to asyncAfter, keep it in a property, and call cancel() when the user leaves the screen. Keep items per key and cancel the previous one when scheduling a new one, and you get a debounce too.
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