Implement a dropdown history in a UITextField or similar component

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I have a case where users enter a string, and would like the users to be able to quickly select the previously entered, and validated options they have entered before.

Currently the user enters text via a UITextField, ideally I'd like to keep this, or aesthetically this at least, and have a list of the previously validated inputs drop down below, where tapping any of them would fill the UITextView.

Basically I want a dropbox, which is simply filled with previous inputs, but those inputs are not listed on the main UI, only when the user selects the text view.

Can anyone point me towards how to acomplish this?

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