I was once working on an iPhone application that shows a large number of inputs, grouped into various categories, in a UITableView. To change the value of one of the inputs, the user presses the corresponding row in the table view and alters the value in a separate screen that appears. The table view had a section for each category and each section contained a table cell (row) for each input.

The problem was that the number of inputs became very, very large so that it didn't give the user a very good overview. It was even tedious to scroll from the top of the table to the bottom.

We decided that the user should be able to collapse and expand the sections (categories) of the table by simply pressing the header of the section. We required that the code that achieves this should be reusable and that it requires the least possible number of changes to the existing code.


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