ios - View Object for Dropdown selection -

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i'm looking create ui in swift xcode, can't find correct object it. have array of elements (think tableview). want select subset of these elements. when object not clicked on (dropped down) want display list of selected elements. ideas use?

waiting

[element a] [element d]

selected

[element a*] [element b] [element c] [element d*] [element e]

thanks


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