Returns the maximum track image associated with the specified control state.
- iOS 2.0+
The control state whose maximum track image you want to use. Specify a single control state value for this parameter.
The maximum track image associated with the specified state, or
nil if an appropriate image could not be retrieved. This method might return
nil if you specify multiple control states in the
state parameter. For a description of track images, see Customizing the Slider’s Appearance.