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Earlier this week I was working on a project where I wanted to filter a table view based on tags. The data model I was working with was very simple. My table view was bound to an array of objects through an NSArrayController, and each object had it’s own array of NSStrings which represented tags. My goal was to create a filter bar control, which I could bind to the array controller in order to popular the list of tags. The filter bar would display each unique tag once, and update itself when objects were added or removed, or an object’s tag array changed.