| 摘要 |
A user interface element for selecting items from a hierarchy of items can present a cell for each level in the hierarchy of items. Each cell can be associated with a level in the hierarchy and is operable to receive user input. In response to receiving user input directed to a cell, a collection of items can be presented where each presented item is from the level in the hierarchy associated with the cell. Each presented item can also be a child of a selected item in a cell associated with a higher level in the hierarchy.
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