TabBar

name	description	type	default
selectedIndex	current selected tab index	number	0
style	custom style for the tab bar	custom
indicatorStyle	custom style for the selected indicator	custom
isContentIndicator	whethere the indicator should mark item's content instead of the whole item's width	bool
ignoreLastTab	whethere the indicator should mark the last tab or not (onTabSelected will return tab's index when selected)	bool
disableAnimatedTransition	disable the animated transition of the tab indicator	bool
onChangeIndex	callback for when index has change (will not be called on last tab when passing ignoreLastTab)	func
onTabSelected	callback for when tab selected	func
mode	FIT to force the content to fit to screen, or SCROLL to allow content overflow	enum	'FIT'
useGradientFinish	Add gradiant effect for scroll overflow. IMPORTANT: must have a native module available!	bool
enableShadow	Show Tab Bar bottom shadow (iOS only)	bool
height			51

See example here.