react-native-navigation/ios/RCCViewController.m

#import "RCCViewController.h"
#import "RCCNavigationController.h"
#import "RCCTabBarController.h"
#import "RCCDrawerController.h"
#import "RCCTheSideBarManagerViewController.h"
#import "RCTRootView.h"
#import "RCCManager.h"
#import "RCTConvert.h"
#import "RCCExternalViewControllerProtocol.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>
@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];
    }
    
    return controller;
}

- (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];

  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;

  [self commonInit:reactView navigatorStyle:navigatorStyle props:passProps];

  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:navigatorStyle];
  
  [self setStyleOnInit];
  
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onRNReload) name:RCTReloadNotification object:nil];
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onCancelReactTouches) name:RCCViewControllerCancelReactTouchesNotification object:nil];
  
  // In order to support 3rd party native ViewControllers, we support passing a class name as a prop mamed `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)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    [self setStyleOnAppear];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    
    [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];
}

-(void)setStyleOnAppearForViewController:(UIViewController*)viewController
{
    NSString *screenBackgroundColor = self.navigatorStyle[@"screenBackgroundColor"];
    if (screenBackgroundColor)
    {
        UIColor *color = screenBackgroundColor != (id)[NSNull null] ? [RCTConvert UIColor:screenBackgroundColor] : nil;
        self.view.backgroundColor = color;
    }
 
    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;
    }
    
    NSString *navBarTextColor = self.navigatorStyle[@"navBarTextColor"];
    if (navBarTextColor)
    {
        UIColor *color = navBarTextColor != (id)[NSNull null] ? [RCTConvert UIColor:navBarTextColor] : nil;
        [viewController.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : color}];
    }
    else
    {
        [viewController.navigationController.navigationBar setTitleTextAttributes:nil];
    }
    
    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;
    }
    
    NSString *statusBarTextColorScheme = self.navigatorStyle[@"statusBarTextColorScheme"];
    if (statusBarTextColorScheme && [statusBarTextColorScheme isEqualToString:@"light"])
    {
        viewController.navigationController.navigationBar.barStyle = UIBarStyleBlack;
        self._statusBarTextColorSchemeLight = YES;
    }
    else
    {
        viewController.navigationController.navigationBar.barStyle = UIBarStyleDefault;
        self._statusBarTextColorSchemeLight = NO;
    }
    
    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)
    {
        if (![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 addSubview:blur];
        }
    }
    
    NSNumber *navBarBlur = self.navigatorStyle[@"navBarBlur"];
    BOOL navBarBlurBool = navBarBlur ? [navBarBlur boolValue] : NO;
    if (navBarBlurBool)
    {
        if (![viewController.navigationController.navigationBar viewWithTag:BLUR_NAVBAR_TAG])
        {
            [self storeOriginalNavBarImages];
            
            [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
            self.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, self.navigationController.navigationBar.frame.size.width, self.navigationController.navigationBar.frame.size.height + statusBarFrame.size.height);
            blur.userInteractionEnabled = NO;
            blur.tag = BLUR_NAVBAR_TAG;
            [self.navigationController.navigationBar insertSubview:blur atIndex:0];
        }
    }
    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;
    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;
        }
    }
    
    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 *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)
    self.originalInteractivePopGestureDelegate = nil;
    if (self.navigationController != nil && self.navigationController.interactivePopGestureRecognizer != nil)
    {
      id <UIGestureRecognizerDelegate> interactivePopGestureRecognizer = self.navigationController.interactivePopGestureRecognizer.delegate;
      if (interactivePopGestureRecognizer != nil)
      {
        self.originalInteractivePopGestureDelegate = interactivePopGestureRecognizer;
        self.navigationController.interactivePopGestureRecognizer.delegate = self;
      }
    }
}

-(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;
    }
}

- (BOOL)hidesBottomBarWhenPushed
{
    if (!self._hidesBottomBarWhenPushed) return NO;
    return (self.navigationController.topViewController == self);
}

- (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 - 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;
}

@end