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# register(_:forCellReuseIdentifier:)

Registers a nib object that contains a cell with the table view under a specified identifier.

```
func register(_ nib: UINib?, forCellReuseIdentifier identifier: String)
```

## Parameters

`nib`

A nib object that specifies the nib file to use to create the cell.

`identifier`

The reuse identifier for the cell. This parameter must not be `nil` and must not be an empty string.

## Discussion

Before dequeueing any cells, call this method or the [`register(_:forCellReuseIdentifier:)`](/documentation/UIKit/UITableView/register(_:forCellReuseIdentifier:)-3l3ct) method to tell the table view how to create new cells. If a cell of the specified type isn’t currently in a reuse queue, the table view uses the provided information to create a new cell object automatically.

If you previously registered a class or nib file with the same reuse identifier, the nib you specify in the `nib` parameter replaces the old entry. You may specify `nil` for `nib` if you want to unregister the nib from the specified reuse identifier.

## See Also

[`tableView(_:cellForRowAt:)`](/documentation/UIKit/UITableViewDataSource/tableView(_:cellForRowAt:))

Asks the data source for a cell to insert in a particular location of the table view.


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