react-native-navigation/lib/ios/Utils/UIViewController+Utils.m

#import "UIViewController+Utils.h"

@implementation UIViewController (Utils)

- (void)forEachChild:(void (^)(UIViewController *child))perform {
    for (UIViewController *child in [self childViewControllers]) {
        perform(child);
    }
}

- (BOOL)isLastInStack {
    return self.navigationController.childViewControllers.lastObject == self;
}

@end