NavigationBarLabelBehavior
NavigationBarLabelBehavior
enum has the following values:
ALWAYS_HIDE
Never shows any of the labels under the navigation bar destinations, regardless of selected vs unselected.
ALWAYS_SHOW
Always shows all of the labels under each navigation bar destination, selected and unselected.
ONLY_SHOW_SELECTED
Only shows the labels of the selected navigation bar destination. When a destination is unselected, the label will be faded out, and the icon will be centered. When a destination is selected, the label will fade in and the label and icon will slide up so that they are both centered.