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

#import "RNNTabBarController.h"

#define kTabBarHiddenDuration 0.3

@implementation RNNTabBarController {
	NSUInteger _currentTabIndex;
	RNNEventEmitter *_eventEmitter;
}

- (instancetype)initWithEventEmitter:(id)eventEmitter {
	self = [super init];
	_eventEmitter = eventEmitter;
	self.delegate = self;
	return self;
}

- (void)performOnChildLoad:(RNNNavigationOptions *)childOptions {
	RNNNavigationOptions* combinedOptions = [_presenter presentWithChildOptions:childOptions on:self];
	if ([self.parentViewController respondsToSelector:@selector(performOnChildLoad:)]) {
		[self.parentViewController performSelector:@selector(performOnChildLoad:) withObject:combinedOptions];
	}
}

- (void)performOnChildWillAppear:(RNNNavigationOptions *)childOptions {
	RNNNavigationOptions* combinedOptions = [_presenter presentWithChildOptions:childOptions on:self];
	if ([self.parentViewController respondsToSelector:@selector(performOnChildWillAppear:)]) {
		[self.parentViewController performSelector:@selector(performOnChildWillAppear:) withObject:combinedOptions];
	}
}

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

- (void)setSelectedIndexByComponentID:(NSString *)componentID {
	for (id child in self.childViewControllers) {
		UIViewController<RNNParentProtocol>* vc = child;

		if ([vc.layoutInfo.componentId isEqualToString:componentID]) {
			[self setSelectedIndex:[self.childViewControllers indexOfObject:child]];
		}
	}
}

- (void)setSelectedIndex:(NSUInteger)selectedIndex {
	_currentTabIndex = selectedIndex;
	[super setSelectedIndex:selectedIndex];
}

- (UIViewController *)getLeafViewController {
	return ((UIViewController<RNNParentProtocol>*)self.selectedViewController).getLeafViewController;
}

- (UIStatusBarStyle)preferredStatusBarStyle {
	return ((UIViewController<RNNParentProtocol>*)self.selectedViewController).preferredStatusBarStyle;
}

- (void)setViewControllers:(NSArray<__kindof UIViewController *> *)viewControllers {
	[super setViewControllers:viewControllers];
}

#pragma mark UITabBarControllerDelegate

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
	[_eventEmitter sendBottomTabSelected:@(tabBarController.selectedIndex) unselected:@(_currentTabIndex)];
	_currentTabIndex = tabBarController.selectedIndex;
}

@end