react-native-navigation/ios/RCCViewController.m

#import "RCCViewController.h"
#import "RCCNavigationController.h"
#import "RCCTabBarController.h"
#import "RCCDrawerController.h"
#import "RCCTheSideBarManagerViewController.h"
#import <React/RCTRootView.h>
#import "RCCManager.h"
#import <React/RCTConvert.h>
#import <React/RCTEventDispatcher.h>
#import "RCCExternalViewControllerProtocol.h"
#import "RCTHelpers.h"
#import "RCCTitleViewHelper.h"
#import "RCCCustomTitleView.h"


NSString* const RCCViewControllerCancelReactTouchesNotification = @"RCCViewControllerCancelReactTouchesNotification";

const NSInteger BLUR_STATUS_TAG = 78264801;
const NSInteger BLUR_NAVBAR_TAG = 78264802;
const NSInteger TRANSPARENT_NAVBAR_TAG = 78264803;

@interface RCCViewController() <UIGestureRecognizerDelegate, UIViewControllerPreviewingDelegate>
@property (nonatomic) BOOL _hidesBottomBarWhenPushed;
@property (nonatomic) BOOL _statusBarHideWithNavBar;
@property (nonatomic) BOOL _statusBarHidden;
@property (nonatomic) BOOL _statusBarTextColorSchemeLight;
@property (nonatomic, strong) NSDictionary *originalNavBarImages;
@property (nonatomic, strong) UIImageView *navBarHairlineImageView;
@property (nonatomic, weak) id <UIGestureRecognizerDelegate> originalInteractivePopGestureDelegate;
@end

@implementation RCCViewController

-(UIImageView *)navBarHairlineImageView {
    if (!_navBarHairlineImageView) {
        _navBarHairlineImageView = [self findHairlineImageViewUnder:self.navigationController.navigationBar];
    }
    return _navBarHairlineImageView;
}

+ (UIViewController*)controllerWithLayout:(NSDictionary *)layout globalProps:(NSDictionary *)globalProps bridge:(RCTBridge *)bridge {
    UIViewController* controller = nil;
    if (!layout) return nil;
    
    // get props
    if (!layout[@"props"]) return nil;
    if (![layout[@"props"] isKindOfClass:[NSDictionary class]]) return nil;
    NSDictionary *props = layout[@"props"];
    
    // get children
    if (!layout[@"children"]) return nil;
    if (![layout[@"children"] isKindOfClass:[NSArray class]]) return nil;
    NSArray *children = layout[@"children"];
    
    // create according to type
    NSString *type = layout[@"type"];
    if (!type) return nil;
    
    // regular view controller
    if ([type isEqualToString:@"ViewControllerIOS"]) {
        controller = [[RCCViewController alloc] initWithProps:props children:children globalProps:globalProps bridge:bridge];
    }
    
    // navigation controller
    if ([type isEqualToString:@"NavigationControllerIOS"]) {
        controller = [[RCCNavigationController alloc] initWithProps:props children:children globalProps:globalProps bridge:bridge];
    }
    
    // tab bar controller
    if ([type isEqualToString:@"TabBarControllerIOS"]) {
        controller = [[RCCTabBarController alloc] initWithProps:props children:children globalProps:globalProps bridge:bridge];
    }
    
    // side menu controller
    if ([type isEqualToString:@"DrawerControllerIOS"]) {
        NSString *drawerType = props[@"type"];
        
        if ([drawerType isEqualToString:@"TheSideBar"]) {
            
            controller = [[RCCTheSideBarManagerViewController alloc] initWithProps:props children:children globalProps:globalProps bridge:bridge];
        }
        else {
            controller = [[RCCDrawerController alloc] initWithProps:props children:children globalProps:globalProps bridge:bridge];
        }
    }
    
    // register the controller if we have an id
    NSString *componentId = props[@"id"];
    if (controller && componentId) {
        [[RCCManager sharedInstance] registerController:controller componentId:componentId componentType:type];
        
        if([controller isKindOfClass:[RCCViewController class]])
        {
            ((RCCViewController*)controller).controllerId = componentId;
        }
    }
    
    // set background image at root level
    NSString *rootBackgroundImageName = props[@"style"][@"rootBackgroundImageName"];
    if (rootBackgroundImageName) {
        UIImage *image = [UIImage imageNamed: rootBackgroundImageName];
        UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
        [controller.view insertSubview:imageView atIndex:0];
    }
    
    return controller;
}

-(NSDictionary*)addCommandTypeAndTimestampIfExists:(NSDictionary*)globalProps passProps:(NSDictionary*)passProps {
    NSMutableDictionary *modifiedPassProps = [NSMutableDictionary dictionaryWithDictionary:passProps];
    
    NSString *commandType = globalProps[GLOBAL_SCREEN_ACTION_COMMAND_TYPE];
    if (commandType) {
        modifiedPassProps[GLOBAL_SCREEN_ACTION_COMMAND_TYPE] = commandType;
    }
    
    NSString *timestamp = globalProps[GLOBAL_SCREEN_ACTION_TIMESTAMP];
    if (timestamp) {
        modifiedPassProps[GLOBAL_SCREEN_ACTION_TIMESTAMP] = timestamp;
    }
    return modifiedPassProps;
}



- (instancetype)initWithProps:(NSDictionary *)props children:(NSArray *)children globalProps:(NSDictionary *)globalProps bridge:(RCTBridge *)bridge {
    NSString *component = props[@"component"];
    if (!component) return nil;
    
    NSDictionary *passProps = props[@"passProps"];
    NSDictionary *navigatorStyle = props[@"style"];
    
    NSMutableDictionary *mergedProps = [NSMutableDictionary dictionaryWithDictionary:globalProps];
    [mergedProps addEntriesFromDictionary:passProps];
    
    RCTRootView *reactView = [[RCTRootView alloc] initWithBridge:bridge moduleName:component initialProperties:mergedProps];
    if (!reactView) return nil;
    
    self = [super init];
    if (!self) return nil;
    
    [self commonInit:reactView navigatorStyle:navigatorStyle props:props];
    
    self.navigationController.interactivePopGestureRecognizer.delegate = self;
    
    return self;
}

- (instancetype)initWithComponent:(NSString *)component passProps:(NSDictionary *)passProps navigatorStyle:(NSDictionary*)navigatorStyle globalProps:(NSDictionary *)globalProps bridge:(RCTBridge *)bridge {
    NSMutableDictionary *mergedProps = [NSMutableDictionary dictionaryWithDictionary:globalProps];
    [mergedProps addEntriesFromDictionary:passProps];
    
    RCTRootView *reactView = [[RCTRootView alloc] initWithBridge:bridge moduleName:component initialProperties:mergedProps];
    if (!reactView) return nil;
    
    self = [super init];
    if (!self) return nil;
    
    NSDictionary *modifiedPassProps = [self addCommandTypeAndTimestampIfExists:globalProps passProps:passProps];
    
    [self commonInit:reactView navigatorStyle:navigatorStyle props:modifiedPassProps];
    
    return self;
}

- (void)commonInit:(RCTRootView*)reactView navigatorStyle:(NSDictionary*)navigatorStyle props:(NSDictionary*)props {
    self.view = reactView;
    
    self.edgesForExtendedLayout = UIRectEdgeNone; // default
    self.automaticallyAdjustsScrollViewInsets = NO; // default
    
    self.navigatorStyle = [NSMutableDictionary dictionaryWithDictionary:[[RCCManager sharedInstance] getAppStyle]];
    [self.navigatorStyle addEntriesFromDictionary:navigatorStyle];
    
    
    [self setStyleOnInit];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onRNReload) name:RCTJavaScriptWillStartLoadingNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onCancelReactTouches) name:RCCViewControllerCancelReactTouchesNotification object:nil];
    
    self.commandType = props[GLOBAL_SCREEN_ACTION_COMMAND_TYPE];
    self.timestamp = props[GLOBAL_SCREEN_ACTION_TIMESTAMP];
    
    
    // In order to support 3rd party native ViewControllers, we support passing a class name as a prop named `ExternalNativeScreenClass`
    // In this case, we create an instance and add it as a child ViewController which preserves the VC lifecycle.
    // In case some props are necessary in the native ViewController, the ExternalNativeScreenProps can be used to pass them
    [self addExternalVCIfNecessary:props];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    self.view = nil;
}

-(void)onRNReload {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    self.view = nil;
}

-(void)onCancelReactTouches {
    if ([self.view isKindOfClass:[RCTRootView class]]){
        [(RCTRootView*)self.view cancelTouches];
    }
}

- (void)sendScreenChangedEvent:(NSString *)eventName {
    if (self.rootView != nil) {
        RCTRootView *rootView = self.rootView;
        
        if (rootView.appProperties && rootView.appProperties[@"navigatorEventID"]) {
            
            [[[RCCManager sharedInstance] getBridge].eventDispatcher sendAppEventWithName:rootView.appProperties[@"navigatorEventID"] body:@
             {
                 @"type": @"ScreenChangedEvent",
                 @"id": eventName
             }];
        }
    }
}

- (void)sendGlobalScreenEvent:(NSString *)eventName endTimestampString:(NSString *)endTimestampStr shouldReset:(BOOL)shouldReset {
    if (self.rootView != nil){
        RCTRootView *rootView = self.rootView;
        NSString *screenName = [rootView moduleName];
        
        [[[RCCManager sharedInstance] getBridge].eventDispatcher sendAppEventWithName:eventName body:@
         {
             @"commandType": self.commandType ? self.commandType : @"",
             @"screen": screenName ? screenName : @"",
             @"startTime": self.timestamp ? self.timestamp : @"",
             @"endTime": endTimestampStr ? endTimestampStr : @""
         }];
        
        if (shouldReset) {
            self.commandType = nil;
            self.timestamp = nil;
        }
    }
}


-(BOOL)isDisappearTriggeredFromPop:(NSString *)eventName {
    NSArray *navigationViewControllers = self.navigationController.viewControllers;
    
    if (navigationViewControllers.lastObject == self || [navigationViewControllers indexOfObject:self] == NSNotFound) {
        return YES;
    }
    return NO;
}

- (NSString *)getTimestampString {
    long long milliseconds = (long long)([[NSDate date] timeIntervalSince1970] * 1000.0);
    return [NSString stringWithFormat:@"%lld", milliseconds];
}

// This is walk around for React-Native bug.
// https://github.com/wix/react-native-navigation/issues/1446
//
// Buttons in ScrollView after changing route/pushing/showing modal
// while there is a momentum scroll are not clickable.
// Back to normal after user start scroll with momentum
- (void)_traverseAndCall:(UIView*)view {
    if([view isKindOfClass:[UIScrollView class]] && ([[(UIScrollView*)view delegate] respondsToSelector:@selector(scrollViewDidEndDecelerating:)]) ) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [[(UIScrollView*)view delegate] scrollViewDidEndDecelerating:(id)view];
        });
        
    }
    
    [view.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        [self _traverseAndCall:obj];
    }];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self sendGlobalScreenEvent:@"didAppear" endTimestampString:[self getTimestampString] shouldReset:YES];
    [self sendScreenChangedEvent:@"didAppear"];
    
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self sendGlobalScreenEvent:@"willAppear" endTimestampString:[self getTimestampString] shouldReset:NO];
    [self sendScreenChangedEvent:@"willAppear"];
    [self setStyleOnAppear];
}

- (void)viewDidDisappear:(BOOL)animated {
    [self _traverseAndCall:self.view];
    [super viewDidDisappear:animated];
    [self sendGlobalScreenEvent:@"didDisappear" endTimestampString:[self getTimestampString] shouldReset:YES];
    [self sendScreenChangedEvent:@"didDisappear"];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self sendGlobalScreenEvent:@"willDisappear" endTimestampString:[self getTimestampString] shouldReset:NO];
    [self sendScreenChangedEvent:@"willDisappear"];
    [self setStyleOnDisappear];
}

// most styles should be set here since when we pop a view controller that changed them
// we want to reset the style to what we expect (so we need to reset on every willAppear)
- (void)setStyleOnAppear {
    [self setStyleOnAppearForViewController:self appeared:false];
}

- (void)updateStyle {
    [self setStyleOnAppearForViewController:self appeared:true];
}

-(void)setStyleOnAppearForViewController:(UIViewController*)viewController appeared:(BOOL)appeared {
    NSString *screenBackgroundColor = self.navigatorStyle[@"screenBackgroundColor"];
    if (screenBackgroundColor) {
        
        UIColor *color = screenBackgroundColor != (id)[NSNull null] ? [RCTConvert UIColor:screenBackgroundColor] : nil;
        viewController.view.backgroundColor = color;
    }
    
    NSString *screenBackgroundImageName = self.navigatorStyle[@"screenBackgroundImageName"];
    if (screenBackgroundImageName) {
        
        UIImage *image = [UIImage imageNamed: screenBackgroundImageName];
        viewController.view.layer.contents = (__bridge id _Nullable)(image.CGImage);
    }
    
    NSString *navBarBackgroundColor = self.navigatorStyle[@"navBarBackgroundColor"];
    if (navBarBackgroundColor) {
        
        UIColor *color = navBarBackgroundColor != (id)[NSNull null] ? [RCTConvert UIColor:navBarBackgroundColor] : nil;
        viewController.navigationController.navigationBar.barTintColor = color;
        
    } else {
        viewController.navigationController.navigationBar.barTintColor = nil;
    }
    
    NSMutableDictionary *titleTextAttributes = [RCTHelpers textAttributesFromDictionary:self.navigatorStyle withPrefix:@"navBarText" baseFont:[UIFont boldSystemFontOfSize:17]];
    [self.navigationController.navigationBar setTitleTextAttributes:titleTextAttributes];
    
    NSMutableDictionary *navButtonTextAttributes = [RCTHelpers textAttributesFromDictionary:self.navigatorStyle withPrefix:@"navBarButton"];
    NSMutableDictionary *leftNavButtonTextAttributes = [RCTHelpers textAttributesFromDictionary:self.navigatorStyle withPrefix:@"navBarLeftButton"];
    NSMutableDictionary *rightNavButtonTextAttributes = [RCTHelpers textAttributesFromDictionary:self.navigatorStyle withPrefix:@"navBarRightButton"];
    
    if (
        navButtonTextAttributes.allKeys.count > 0 ||
        leftNavButtonTextAttributes.allKeys.count > 0 ||
        rightNavButtonTextAttributes.allKeys.count > 0
        ) {
        
        for (UIBarButtonItem *item in viewController.navigationItem.leftBarButtonItems) {
            if (leftNavButtonTextAttributes.allKeys.count > 0) {
                NSDictionary *previousAttributes = [item titleTextAttributesForState:UIControlStateNormal];
                NSMutableDictionary *mergedAttributes;
                
                if (leftNavButtonTextAttributes.allKeys.count > 0) {
                    mergedAttributes = [leftNavButtonTextAttributes mutableCopy];
                } else {
                    mergedAttributes = [navButtonTextAttributes mutableCopy];
                }
                
                [mergedAttributes addEntriesFromDictionary:previousAttributes];
                
                [item setTitleTextAttributes:[mergedAttributes copy] forState:UIControlStateNormal];
                [item setTitleTextAttributes:[mergedAttributes copy] forState:UIControlStateHighlighted];
            }
        }
        
        for (UIBarButtonItem *item in viewController.navigationItem.rightBarButtonItems) {
            NSDictionary *previousAttributes = [item titleTextAttributesForState:UIControlStateNormal];
            NSMutableDictionary *mergedAttributes;
            
            if (rightNavButtonTextAttributes.allKeys.count > 0) {
                mergedAttributes = [rightNavButtonTextAttributes mutableCopy];
            } else {
                mergedAttributes = [navButtonTextAttributes mutableCopy];
            }
            
            [mergedAttributes addEntriesFromDictionary:previousAttributes];
            
            [item setTitleTextAttributes:[mergedAttributes copy] forState:UIControlStateNormal];
            [item setTitleTextAttributes:[mergedAttributes copy] forState:UIControlStateHighlighted];
        }
        
        // At the moment, this seems to be the only thing that gets the back button correctly
        [navButtonTextAttributes removeObjectForKey:NSForegroundColorAttributeName];
        [[UIBarButtonItem appearance] setTitleTextAttributes:navButtonTextAttributes forState:UIControlStateNormal];
        [[UIBarButtonItem appearance] setTitleTextAttributes:navButtonTextAttributes forState:UIControlStateHighlighted];
    }
    
    NSString *navBarButtonColor = self.navigatorStyle[@"navBarButtonColor"];
    if (navBarButtonColor) {
        
        UIColor *color = navBarButtonColor != (id)[NSNull null] ? [RCTConvert UIColor:navBarButtonColor] : nil;
        viewController.navigationController.navigationBar.tintColor = color;
        
    } else {
        viewController.navigationController.navigationBar.tintColor = nil;
    }
    
    BOOL topBarElevationShadowEnabled = self.navigatorStyle[@"topBarElevationShadowEnabled"] != (id)[NSNull null] ? [RCTConvert CGFloat:self.navigatorStyle[@"topBarElevationShadowEnabled"]] : NO;
    
    if (topBarElevationShadowEnabled) {
        CGFloat shadowOpacity = self.navigatorStyle[@"topBarShadowOpacity"] != 0 ? [RCTConvert CGFloat:self.navigatorStyle[@"topBarShadowOpacity"]] : 0.2;
        CGFloat shadowOffset = self.navigatorStyle[@"topBarShadowOffset"] != 0 ? [RCTConvert CGFloat:self.navigatorStyle[@"topBarShadowOffset"]] : 3.0;
        CGFloat shadowRadius = self.navigatorStyle[@"topBarShadowRadius"] != 0 ? [RCTConvert CGFloat:self.navigatorStyle[@"topBarShadowRadius"]] : 2.0;
        UIColor *shadowColor = self.navigatorStyle[@"topBarShadowColor"] != (id)[NSNull null] ? [RCTConvert UIColor:self.navigatorStyle[@"topBarShadowColor"]] : UIColor.blackColor;
        
        viewController.navigationController.navigationBar.layer.shadowOpacity = shadowOpacity;
        viewController.navigationController.navigationBar.layer.shadowColor = shadowColor.CGColor;
        viewController.navigationController.navigationBar.layer.shadowOffset = CGSizeMake(0, shadowOffset);
        viewController.navigationController.navigationBar.layer.shadowRadius = shadowRadius;
    }
    
    BOOL viewControllerBasedStatusBar = false;
    
    NSObject *viewControllerBasedStatusBarAppearance = [[NSBundle mainBundle] infoDictionary][@"UIViewControllerBasedStatusBarAppearance"];
    if (viewControllerBasedStatusBarAppearance && [viewControllerBasedStatusBarAppearance isKindOfClass:[NSNumber class]]) {
        viewControllerBasedStatusBar = [(NSNumber *)viewControllerBasedStatusBarAppearance boolValue];
    }
    
    NSString *statusBarTextColorSchemeSingleScreen = self.navigatorStyle[@"statusBarTextColorSchemeSingleScreen"];
    NSString *statusBarTextColorScheme = self.navigatorStyle[@"statusBarTextColorScheme"];
    NSString *finalColorScheme = statusBarTextColorSchemeSingleScreen ? : statusBarTextColorScheme;
    
    if (finalColorScheme && [finalColorScheme isEqualToString:@"light"]) {
        
        if (!statusBarTextColorSchemeSingleScreen) {
            viewController.navigationController.navigationBar.barStyle = UIBarStyleBlack;
        }
        
        self._statusBarTextColorSchemeLight = true;
        if (!viewControllerBasedStatusBarAppearance) {
            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
        }
        
        [viewController setNeedsStatusBarAppearanceUpdate];
        
    } else {
        if (!statusBarTextColorSchemeSingleScreen) {
            viewController.navigationController.navigationBar.barStyle = UIBarStyleDefault;
        }
        
        self._statusBarTextColorSchemeLight = false;
        
        if (!viewControllerBasedStatusBarAppearance) {
            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];
        }
        [viewController setNeedsStatusBarAppearanceUpdate];
    }
    
    NSNumber *tabBarHidden = self.navigatorStyle[@"tabBarHidden"];
    BOOL tabBarHiddenBool = tabBarHidden ? [tabBarHidden boolValue] : NO;
    if (tabBarHiddenBool) {
        UITabBar *tabBar = viewController.tabBarController.tabBar;
        tabBar.transform = CGAffineTransformMakeTranslation(0, tabBar.frame.size.height);
    }
    
    NSNumber *navBarHidden = self.navigatorStyle[@"navBarHidden"];
    BOOL navBarHiddenBool = navBarHidden ? [navBarHidden boolValue] : NO;
    if (viewController.navigationController.navigationBarHidden != navBarHiddenBool) {
        [viewController.navigationController setNavigationBarHidden:navBarHiddenBool animated:YES];
    }
    
    NSNumber *navBarHideOnScroll = self.navigatorStyle[@"navBarHideOnScroll"];
    BOOL navBarHideOnScrollBool = navBarHideOnScroll ? [navBarHideOnScroll boolValue] : NO;
    if (navBarHideOnScrollBool) {
        viewController.navigationController.hidesBarsOnSwipe = YES;
    } else {
        viewController.navigationController.hidesBarsOnSwipe = NO;
    }
    
    NSNumber *statusBarBlur = self.navigatorStyle[@"statusBarBlur"];
    BOOL statusBarBlurBool = statusBarBlur ? [statusBarBlur boolValue] : NO;
    if (statusBarBlurBool && ![viewController.view viewWithTag:BLUR_STATUS_TAG]) {
        
        UIVisualEffectView *blur = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]];
        blur.frame = [[UIApplication sharedApplication] statusBarFrame];
        blur.tag = BLUR_STATUS_TAG;
        [viewController.view insertSubview:blur atIndex:0];
    }
    
    NSNumber *navBarBlur = self.navigatorStyle[@"navBarBlur"];
    BOOL navBarBlurBool = navBarBlur ? [navBarBlur boolValue] : NO;
    if (navBarBlurBool) {
        
        if (![viewController.navigationController.navigationBar viewWithTag:BLUR_NAVBAR_TAG]) {
            [self storeOriginalNavBarImages];
            
            [viewController.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
            viewController.navigationController.navigationBar.shadowImage = [UIImage new];
            UIVisualEffectView *blur = [[UIVisualEffectView alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]];
            CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
            blur.frame = CGRectMake(0, -1 * statusBarFrame.size.height, viewController.navigationController.navigationBar.frame.size.width, viewController.navigationController.navigationBar.frame.size.height + statusBarFrame.size.height);
            blur.userInteractionEnabled = NO;
            blur.tag = BLUR_NAVBAR_TAG;
            [viewController.navigationController.navigationBar insertSubview:blur atIndex:0];
            [viewController.navigationController.navigationBar sendSubviewToBack:blur];
        }
        
    } else {
        
        UIView *blur = [viewController.navigationController.navigationBar viewWithTag:BLUR_NAVBAR_TAG];
        if (blur) {
            [blur removeFromSuperview];
            [viewController.navigationController.navigationBar setBackgroundImage:self.originalNavBarImages[@"bgImage"] forBarMetrics:UIBarMetricsDefault];
            viewController.navigationController.navigationBar.shadowImage = self.originalNavBarImages[@"shadowImage"];
            self.originalNavBarImages = nil;
        }
    }
    
    NSNumber *navBarTransparent = self.navigatorStyle[@"navBarTransparent"];
    BOOL navBarTransparentBool = navBarTransparent ? [navBarTransparent boolValue] : NO;
    
    void (^action)() = ^ {
        if (navBarTransparentBool) {
            if (![viewController.navigationController.navigationBar viewWithTag:TRANSPARENT_NAVBAR_TAG]) {
                [self storeOriginalNavBarImages];
                
                [viewController.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
                viewController.navigationController.navigationBar.shadowImage = [UIImage new];
                UIView *transparentView = [[UIView alloc] initWithFrame:CGRectZero];
                transparentView.tag = TRANSPARENT_NAVBAR_TAG;
                [viewController.navigationController.navigationBar insertSubview:transparentView atIndex:0];
            }
        } else {
            UIView *transparentView = [viewController.navigationController.navigationBar viewWithTag:TRANSPARENT_NAVBAR_TAG];
            if (transparentView) {
                [transparentView removeFromSuperview];
                [viewController.navigationController.navigationBar setBackgroundImage:self.originalNavBarImages[@"bgImage"] forBarMetrics:UIBarMetricsDefault];
                viewController.navigationController.navigationBar.shadowImage = self.originalNavBarImages[@"shadowImage"];
                self.originalNavBarImages = nil;
            }
        }
    };
    
    if (!self.transitionCoordinator || self.transitionCoordinator.initiallyInteractive || !navBarTransparentBool || appeared || [self isModal]) {
        action();
    } else {
        UIView* backgroundView = [self.navigationController.navigationBar valueForKey:@"backgroundView"];
        CGFloat originalAlpha = backgroundView.alpha;
        backgroundView.alpha = navBarTransparentBool ? 0.0 : 1.0;
        [self.transitionCoordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
            action();
        } completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
            backgroundView.alpha = originalAlpha;
        }];
    }
    
    NSNumber *autoAdjustsScrollViewInsets = self.navigatorStyle[@"autoAdjustScrollViewInsets"];
    viewController.automaticallyAdjustsScrollViewInsets = autoAdjustsScrollViewInsets ? [autoAdjustsScrollViewInsets boolValue] : false;
    
    NSNumber *navBarTranslucent = self.navigatorStyle[@"navBarTranslucent"];
    BOOL navBarTranslucentBool = navBarTranslucent ? [navBarTranslucent boolValue] : NO;
    if (navBarTranslucentBool || navBarBlurBool) {
        viewController.navigationController.navigationBar.translucent = YES;
    } else {
        viewController.navigationController.navigationBar.translucent = NO;
    }
    
    NSNumber *extendedLayoutIncludesOpaqueBars = self.navigatorStyle[@"extendedLayoutIncludesOpaqueBars"];
    BOOL extendedLayoutIncludesOpaqueBarsBool = extendedLayoutIncludesOpaqueBars ? [extendedLayoutIncludesOpaqueBars boolValue] : NO;
    viewController.extendedLayoutIncludesOpaqueBars = extendedLayoutIncludesOpaqueBarsBool;
    
    NSNumber *drawUnderNavBar = self.navigatorStyle[@"drawUnderNavBar"];
    BOOL drawUnderNavBarBool = drawUnderNavBar ? [drawUnderNavBar boolValue] : NO;
    if (drawUnderNavBarBool) {
        viewController.edgesForExtendedLayout |= UIRectEdgeTop;
    } else {
        viewController.edgesForExtendedLayout &= ~UIRectEdgeTop;
    }
    
    NSNumber *drawUnderTabBar = self.navigatorStyle[@"drawUnderTabBar"];
    BOOL drawUnderTabBarBool = drawUnderTabBar ? [drawUnderTabBar boolValue] : NO;
    if (drawUnderTabBarBool) {
        viewController.edgesForExtendedLayout |= UIRectEdgeBottom;
    } else {
        viewController.edgesForExtendedLayout &= ~UIRectEdgeBottom;
    }
    
    NSNumber *removeNavBarBorder = self.navigatorStyle[@"navBarNoBorder"];
    BOOL removeNavBarBorderBool = removeNavBarBorder ? [removeNavBarBorder boolValue] : NO;
    if (removeNavBarBorderBool) {
        self.navBarHairlineImageView.hidden = YES;
    } else {
        self.navBarHairlineImageView.hidden = NO;
    }
    
    //Bug fix: in case there is a interactivePopGestureRecognizer, it prevents react-native from getting touch events on the left screen area that the gesture handles
    //overriding the delegate of the gesture prevents this from happening while keeping the gesture intact (another option was to disable it completely by demand)
    if (self.navigationController.viewControllers.count > 1){
        if (self.navigationController != nil && self.navigationController.interactivePopGestureRecognizer != nil)
        {
            id <UIGestureRecognizerDelegate> interactivePopGestureRecognizer = self.navigationController.interactivePopGestureRecognizer.delegate;
            if (interactivePopGestureRecognizer != nil && interactivePopGestureRecognizer != self)
            {
                self.originalInteractivePopGestureDelegate = interactivePopGestureRecognizer;
                self.navigationController.interactivePopGestureRecognizer.delegate = self;
            }
        }
    }
    
    NSString *navBarCustomView = self.navigatorStyle[@"navBarCustomView"];
    if (navBarCustomView && ![self.navigationItem.titleView isKindOfClass:[RCCCustomTitleView class]]) {
        if ([self.view isKindOfClass:[RCTRootView class]]) {
            
            RCTBridge *bridge = ((RCTRootView*)self.view).bridge;
            
            NSDictionary *initialProps = self.navigatorStyle[@"navBarCustomViewInitialProps"];
            RCTRootView *reactView = [[RCTRootView alloc] initWithBridge:bridge moduleName:navBarCustomView initialProperties:initialProps];
            
            RCCCustomTitleView *titleView = [[RCCCustomTitleView alloc] initWithFrame:self.navigationController.navigationBar.bounds
                                                                              subView:reactView
                                                                            alignment:self.navigatorStyle[@"navBarComponentAlignment"]];
            
            self.navigationItem.titleView = titleView;
            self.navigationItem.titleView.backgroundColor = [UIColor clearColor];
            self.navigationItem.titleView.clipsToBounds = YES;
        }
    }
    
#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_10_3
    if (@available(iOS 11.0, *)) {
        if ([self.navigationController.navigationBar respondsToSelector:@selector(setPrefersLargeTitles:)]) {
            NSNumber *prefersLargeTitles = self.navigatorStyle[@"largeTitle"];
            if (prefersLargeTitles) {
                if ([prefersLargeTitles boolValue]) {
                    self.navigationController.navigationBar.prefersLargeTitles = YES;
                    self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeAlways;
                    self.navigationItem.titleView = nil;
                } else {
                    self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeNever;
                }
            } else {
                self.navigationController.navigationBar.prefersLargeTitles = NO;
                self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeNever;
            }
        }
    }
#endif
}

- (BOOL)isModal {
    if([self presentingViewController])
        return YES;
    if([[[self navigationController] presentingViewController] presentedViewController] == [self navigationController])
        return YES;
    if([[[self tabBarController] presentingViewController] isKindOfClass:[UITabBarController class]])
        return YES;
    
    return NO;
}

-(void)processTitleView:(UIViewController*)viewController
                  props:(NSDictionary*)props
                  style:(NSDictionary*)style {
    BOOL isSetSubtitleBool = props[@"isSetSubtitle"] ? [props[@"isSetSubtitle"] boolValue] : NO;
    RCCTitleViewHelper *titleViewHelper = [[RCCTitleViewHelper alloc] init:viewController
                                                      navigationController:self.navigationController
                                                                     title:props[@"title"]
                                                                  subtitle:props[@"subtitle"]
                                                            titleImageData:props[@"titleImage"]
                                                             isSetSubtitle:isSetSubtitleBool];
    
    [titleViewHelper setup:style];
    
}

- (void) viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
    RCCCustomTitleView* customNavBar = (RCCCustomTitleView*) self.navigationItem.titleView;
    if (customNavBar && [customNavBar isKindOfClass:[RCCCustomTitleView class]]) {
        [customNavBar viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
    }
}


-(void)storeOriginalNavBarImages {
    NSMutableDictionary *originalNavBarImages = [@{} mutableCopy];
    UIImage *bgImage = [self.navigationController.navigationBar backgroundImageForBarMetrics:UIBarMetricsDefault];
    if (bgImage != nil) {
        originalNavBarImages[@"bgImage"] = bgImage;
    }
    UIImage *shadowImage = self.navigationController.navigationBar.shadowImage;
    if (shadowImage != nil) {
        originalNavBarImages[@"shadowImage"] = shadowImage;
    }
    self.originalNavBarImages = originalNavBarImages;
    
}

-(void)setStyleOnDisappear {
    self.navBarHairlineImageView.hidden = NO;
    
    if (self.navigationController != nil && self.navigationController.interactivePopGestureRecognizer != nil && self.originalInteractivePopGestureDelegate != nil)
    {
        self.navigationController.interactivePopGestureRecognizer.delegate = self.originalInteractivePopGestureDelegate;
        self.originalInteractivePopGestureDelegate = nil;
    }
}

// only styles that can't be set on willAppear should be set here
- (void)setStyleOnInit {
    NSNumber *tabBarHidden = self.navigatorStyle[@"tabBarHidden"];
    BOOL tabBarHiddenBool = tabBarHidden ? [tabBarHidden boolValue] : NO;
    if (tabBarHiddenBool) {
        self._hidesBottomBarWhenPushed = YES;
    } else {
        self._hidesBottomBarWhenPushed = NO;
    }
    
    NSNumber *statusBarHideWithNavBar = self.navigatorStyle[@"statusBarHideWithNavBar"];
    BOOL statusBarHideWithNavBarBool = statusBarHideWithNavBar ? [statusBarHideWithNavBar boolValue] : NO;
    if (statusBarHideWithNavBarBool) {
        self._statusBarHideWithNavBar = YES;
    } else {
        self._statusBarHideWithNavBar = NO;
    }
    
    NSNumber *statusBarHidden = self.navigatorStyle[@"statusBarHidden"];
    BOOL statusBarHiddenBool = statusBarHidden ? [statusBarHidden boolValue] : NO;
    if (statusBarHiddenBool) {
        self._statusBarHidden = YES;
    } else {
        self._statusBarHidden = NO;
    }
    
    NSDictionary *preferredContentSize = self.navigatorStyle[@"preferredContentSize"];
    if (preferredContentSize) {
        NSNumber *width = preferredContentSize[@"width"];
        NSNumber *height = preferredContentSize[@"height"];
        if (width && height) {
            self.preferredContentSize = CGSizeMake([width floatValue], [height floatValue]);
        }
    }
}

- (BOOL)hidesBottomBarWhenPushed {
    if (!self._hidesBottomBarWhenPushed) return NO;
    return (self.navigationController.topViewController == self) && ![(RCCTabBarController*)self.tabBarController tabBarHidden];
}

- (BOOL)prefersStatusBarHidden {
    if (self._statusBarHidden) {
        return YES;
    }
    
    if (self._statusBarHideWithNavBar) {
        return self.navigationController.isNavigationBarHidden;
    } else {
        return NO;
    }
}

- (void)setNavBarVisibilityChange:(BOOL)animated {
    [self.navigationController setNavigationBarHidden:[self.navigatorStyle[@"navBarHidden"] boolValue] animated:animated];
}


- (UIStatusBarStyle)preferredStatusBarStyle {
    if (self._statusBarTextColorSchemeLight){
        return UIStatusBarStyleLightContent;
    } else {
        return UIStatusBarStyleDefault;
    }
}

- (UIImageView *)findHairlineImageViewUnder:(UIView *)view {
    if ([view isKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {
        return (UIImageView *)view;
    }
    for (UIView *subview in view.subviews) {
        UIImageView *imageView = [self findHairlineImageViewUnder:subview];
        if (imageView) {
            return imageView;
        }
    }
    return nil;
}

-(void)addExternalVCIfNecessary:(NSDictionary*)props {
    NSString *externalScreenClass = props[@"externalNativeScreenClass"];
    if (externalScreenClass != nil) {
        Class class = NSClassFromString(externalScreenClass);
        if (class != NULL) {
            id obj = [[class alloc] init];
            if (obj != nil && [obj isKindOfClass:[UIViewController class]] && [obj conformsToProtocol:@protocol(RCCExternalViewControllerProtocol)]) {
                ((id <RCCExternalViewControllerProtocol>)obj).controllerDelegate = self;
                [obj setProps:props[@"externalNativeScreenProps"]];
                
                UIViewController *viewController = (UIViewController*)obj;
                [self addChildViewController:viewController];
                viewController.view.frame = self.view.bounds;
                [self.view addSubview:viewController.view];
                [viewController didMoveToParentViewController:self];
            } else {
                NSLog(@"addExternalVCIfNecessary: could not create instance. Make sure that your class is a UIViewController whihc confirms to RCCExternalViewControllerProtocol");
            }
        } else {
            NSLog(@"addExternalVCIfNecessary: could not create class from string. Check that the proper class name wass passed in ExternalNativeScreenClass");
        }
    }
}

#pragma mark - Preview Actions

- (void)onActionPress:(NSString *)id {
    if ([self.view isKindOfClass:[RCTRootView class]]) {
        RCTRootView *rootView = (RCTRootView *)self.view;
        if (rootView.appProperties && rootView.appProperties[@"navigatorEventID"]) {
            [[[RCCManager sharedInstance] getBridge].eventDispatcher
             sendAppEventWithName:rootView.appProperties[@"navigatorEventID"]
             body:@{
                    @"type": @"PreviewActionPress",
                    @"id": id
                    }];
        }
    }
}

- (UIPreviewAction *) convertAction:(NSDictionary *)action {
    NSString *actionId = action[@"id"];
    NSString *actionTitle = action[@"title"];
    UIPreviewActionStyle actionStyle = UIPreviewActionStyleDefault;
    if ([action[@"style"] isEqualToString:@"selected"]) {
        actionStyle = UIPreviewActionStyleSelected;
    }
    if ([action[@"style"] isEqualToString:@"destructive"]) {
        actionStyle = UIPreviewActionStyleDestructive;
    }
    return [UIPreviewAction actionWithTitle:actionTitle style:actionStyle handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        [self onActionPress:actionId];
    }];
}

#pragma mark - NewRelic

- (NSString*) customNewRelicInteractionName {
    NSString *interactionName = nil;
    
    if (self.view != nil && [self.view isKindOfClass:[RCTRootView class]]) {
        NSString *moduleName = ((RCTRootView*)self.view).moduleName;
        if(moduleName != nil) {
            interactionName = [NSString stringWithFormat:@"RCCViewController: %@", moduleName];
        }
    }
    
    if (interactionName == nil) {
        interactionName = [NSString stringWithFormat:@"RCCViewController with title: %@", self.title];
    }
    
    return interactionName;
}

#pragma mark - UIGestureRecognizerDelegate
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    NSNumber *disabledBackGesture = self.navigatorStyle[@"disabledBackGesture"];
    BOOL disabledBackGestureBool = disabledBackGesture ? [disabledBackGesture boolValue] : NO;
    return !disabledBackGestureBool;
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    NSNumber *disabledSimultaneousGesture = self.navigatorStyle[@"disabledSimultaneousGesture"];
    BOOL disabledSimultaneousGestureBool = disabledSimultaneousGesture ? [disabledSimultaneousGesture boolValue] : YES; // make default value of disabledSimultaneousGesture is true
    return !disabledSimultaneousGestureBool;
}

#pragma mark - UIViewControllerPreviewingDelegate
- (UIViewController *)previewingContext:(id<UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location {
    return self.previewController;
}

- (void)previewingContext:(id<UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit {
    if (self.previewController.previewCommit == YES) {
        [self.previewController sendGlobalScreenEvent:@"willCommitPreview" endTimestampString:[self.previewController getTimestampString] shouldReset:YES];
        [self.previewController sendScreenChangedEvent:@"willCommitPreview"];
        [self.navigationController pushViewController:self.previewController animated:false];
    }
}

- (NSArray<id<UIPreviewActionItem>> *)previewActionItems {
    NSMutableArray *actions = [[NSMutableArray alloc] init];
    for (NSDictionary *previewAction in self.previewActions) {
        UIPreviewAction *action = [self convertAction:previewAction];
        NSDictionary *actionActions = previewAction[@"actions"];
        if (actionActions.count > 0) {
            NSMutableArray *group = [[NSMutableArray alloc] init];
            for (NSDictionary *previewGroupAction in actionActions) {
                [group addObject:[self convertAction:previewGroupAction]];
            }
            UIPreviewActionGroup *actionGroup = [UIPreviewActionGroup actionGroupWithTitle:action.title style:UIPreviewActionStyleDefault actions:group];
            [actions addObject:actionGroup];
        } else {
            [actions addObject:action];
        }
    }
    return actions;
}

@end