react-native-navigation/lib/ios/RNNTabBarController.m

#import "RNNTabBarController.h"
#define kTabBarHiddenDuration 0.3

@implementation RNNTabBarController

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
	return self.selectedViewController.supportedInterfaceOrientations;
}

- (void)setTabBarHidden:(BOOL)hidden animated:(BOOL)animated {
	CGRect frame = self.tabBar.frame;
	CGFloat height = frame.size.height;
	CGFloat offsetY = (hidden ? self.view.frame.size.height : self.view.frame.size.height-height);
	frame.origin.y = offsetY;
	NSTimeInterval duration = animated ? kTabBarHiddenDuration : 0.0;
	
	[UIView animateWithDuration:duration animations:^{
		self.tabBar.frame = frame;
	}];
}

@end