Called by the picker view when it needs the title to use for a given row in a given component.
- iOS 2.0+
An object representing the picker view requesting the data.
A zero-indexed number identifying a row of
component. Rows are numbered top-to-bottom.
A zero-indexed number identifying a component of
picker. Components are numbered left-to-right.
The string to use as the title of the indicated component row.
If you implement both this method and the
picker method, the picker view prefers the
picker method. However, if that method returns
nil, the picker view falls back to using the string returned by this method.