RCCManager.m

#import "RCCManager.h"
#import "RCCViewController.h"
#import <React/RCTBridge.h>
#import <React/RCTRedBox.h>
#import <React/RCTConvert.h>
#import <Foundation/Foundation.h>

@interface RCCManager() <RCTBridgeDelegate>
@property (nonatomic, strong) NSMutableDictionary *modulesRegistry;
@property (nonatomic, strong) RCTBridge *sharedBridge;
@property (nonatomic, strong) NSURL *bundleURL;
@property (nonatomic, strong, readwrite) NSDictionary *globalAppStyle;
@end

@implementation RCCManager

+ (instancetype)sharedInstance
{
  static RCCManager *sharedInstance = nil;
  static dispatch_once_t onceToken = 0;
  
  dispatch_once(&onceToken,^{
    if (sharedInstance == nil)
    {
      sharedInstance = [[RCCManager alloc] init];
    }
  });
  
  return sharedInstance;
}

+ (instancetype)sharedIntance
{
  return [RCCManager sharedInstance];
}

- (instancetype)init
{
  self = [super init];
  if (self)
  {
    self.modulesRegistry = [@{} mutableCopy];
    
    //    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onRNReload) name:RCTReloadNotification object:nil];
  }
  return self;
}

-(void)clearModuleRegistry
{
  [self.modulesRegistry removeAllObjects];
}

-(void)onRNReload
{
  id<UIApplicationDelegate> appDelegate = [UIApplication sharedApplication].delegate;
  appDelegate.window.rootViewController = nil;
  [self setAppStyle:nil];
  [self clearModuleRegistry];
}

-(void)registerController:(UIViewController*)controller componentId:(NSString*)componentId componentType:(NSString*)componentType
{
  if (controller == nil || componentId == nil)
  {
    return;
  }
  
  NSMutableDictionary *componentsDic = self.modulesRegistry[componentType];
  if (componentsDic == nil)
  {
    componentsDic = [@{} mutableCopy];
    self.modulesRegistry[componentType] = componentsDic;
  }
  
  /*
   TODO: we really want this error, but we need to unregister controllers when they dealloc
   if (componentsDic[componentId])
   {
   [self.sharedBridge.redBox showErrorMessage:[NSString stringWithFormat:@"Controllers: controller with id %@ is already registered. Make sure all of the controller id's you use are unique.", componentId]];
   }
   */
  
  componentsDic[componentId] = controller;
}

-(void)unregisterController:(UIViewController*)vc
{
  if (vc == nil) return;
  
  for (NSString *key in [self.modulesRegistry allKeys])
  {
    NSMutableDictionary *componentsDic = self.modulesRegistry[key];
    for (NSString *componentID in [componentsDic allKeys])
    {
      UIViewController *tmpVc = componentsDic[componentID];
      if (tmpVc == vc)
      {
        [componentsDic removeObjectForKey:componentID];
      }
    }
  }
}

-(id)getControllerWithId:(NSString*)componentId componentType:(NSString*)componentType
{
  if (componentId == nil)
  {
    return nil;
  }
  
  id component = nil;
  
  NSMutableDictionary *componentsDic = self.modulesRegistry[componentType];
  if (componentsDic != nil)
  {
    component = componentsDic[componentId];
  }
  
  return component;
}

-(NSString*) getIdForController:(UIViewController*)vc
{
  if([vc isKindOfClass:[RCCViewController class]])
  {
    NSString *controllerId = ((RCCViewController*)vc).controllerId;
    if(controllerId != nil)
    {
      return controllerId;
    }
  }
  
  for (NSString *key in [self.modulesRegistry allKeys])
  {
    NSMutableDictionary *componentsDic = self.modulesRegistry[key];
    for (NSString *componentID in [componentsDic allKeys])
    {
      UIViewController *tmpVc = componentsDic[componentID];
      if (tmpVc == vc)
      {
        return componentID;
      }
    }
  }
  return nil;
}

-(void)initBridgeWithBundleURL:(NSURL *)bundleURL
{
  [self initBridgeWithBundleURL :bundleURL launchOptions:nil];
}

-(void)initBridgeWithBundleURL:(NSURL *)bundleURL launchOptions:(NSDictionary *)launchOptions
{
  if (self.sharedBridge) return;
  
  self.bundleURL = bundleURL;
  self.sharedBridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
  
  [[self class] showSplashScreen];
}

-(RCTBridge*)getBridge
{
  return self.sharedBridge;
}

-(UIWindow*)getAppWindow
{
  UIApplication *app = [UIApplication sharedApplication];
  UIWindow *window = (app.keyWindow != nil) ? app.keyWindow : app.windows[0];
  return window;
}

#pragma mark - Splash Screen

+ (void)showSplashScreen
{
  
  UIViewController* viewControllerFromLaunchStoryboard;
  viewControllerFromLaunchStoryboard = [self viewControllerFromLaunchStoryboard];
  if (viewControllerFromLaunchStoryboard)
  {
    [self showSplashScreenViewController:viewControllerFromLaunchStoryboard];
    return;
  }
  
  CGRect screenBounds = [UIScreen mainScreen].bounds;
  UIViewController* viewControllerFromLaunchNib = [self viewControllerFromLaunchNibForScreenBounds:screenBounds];
  if (viewControllerFromLaunchNib)
  {
    [self showSplashScreenViewController:viewControllerFromLaunchNib];
    return;
  }
  
  UIViewController* viewControllerFromLaunchImage = [self viewControllerFromLaunchImageForScreenBounds:screenBounds];
  if (viewControllerFromLaunchImage)
  {
    [self showSplashScreenViewController:viewControllerFromLaunchImage];
    return;
  }
  
  UIViewController* viewController = [[UIViewController alloc] init];
  viewController.view.frame = screenBounds;
  viewController.view.backgroundColor = [UIColor whiteColor];
  
  [self showSplashScreenViewController:viewController];
}

+ (UIViewController *)viewControllerFromLaunchStoryboard
{
  NSString* launchStoryboardName = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UILaunchStoryboardName"];
  if (launchStoryboardName == nil)
  {
    return nil;
  }
  
  @try {
    UIStoryboard* storyboard = [UIStoryboard storyboardWithName:launchStoryboardName bundle:nil];
    return storyboard.instantiateInitialViewController;
  }
  @catch(NSException *exception) {
    return nil;
  }
}

+ (UIViewController *)viewControllerFromLaunchNibForScreenBounds:(CGRect)screenBounds
{
  NSString* launchStoryboardName = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UILaunchStoryboardName"];
  if (launchStoryboardName == nil)
  {
    return nil;
  }
  
  @try {
    id nibContents = [[NSBundle mainBundle] loadNibNamed:launchStoryboardName owner:self options:nil];
    if (!nibContents || [nibContents count] == 0)
    {
      return nil;
    }
    
    id firstObject = [nibContents firstObject];
    if (![firstObject isKindOfClass:[UIView class]])
    {
      return nil;
    }
    
    UIViewController* viewController = [[UIViewController alloc] init];
    viewController.view = (UIView *)firstObject;
    viewController.view.frame = screenBounds;
    return viewController;
  }
  @catch(NSException *exception) {
    return nil;
  }
}

+ (UIViewController *)viewControllerFromLaunchImageForScreenBounds:(CGRect)screenBounds
{
  //load the splash from the default image or from LaunchImage in the xcassets
  
  CGFloat screenHeight = screenBounds.size.height;
  
  NSString* imageName = @"Default";
  if (screenHeight == 568)
    imageName = [imageName stringByAppendingString:@"-568h"];
  else if (screenHeight == 667)
    imageName = [imageName stringByAppendingString:@"-667h"];
  else if (screenHeight == 736)
    imageName = [imageName stringByAppendingString:@"-736h"];
  
  //xcassets LaunchImage files
  UIImage *image = [UIImage imageNamed:imageName];
  if (image == nil)
  {
    imageName = @"LaunchImage";
    
    if (screenHeight == 480)
      imageName = [imageName stringByAppendingString:@"-700"];
    if (screenHeight == 568)
      imageName = [imageName stringByAppendingString:@"-700-568h"];
    else if (screenHeight == 667)
      imageName = [imageName stringByAppendingString:@"-800-667h"];
    else if (screenHeight == 736)
      imageName = [imageName stringByAppendingString:@"-800-Portrait-736h"];
    else if (screenHeight == 812)
      imageName = [imageName stringByAppendingString:@"-1100-Portrait-2436h"];
    else if (screenHeight == 1024)
      imageName = [imageName stringByAppendingString:@"-Portrait"];
    
    image = [UIImage imageNamed:imageName];
  }
  
  if (image == nil)
  {
    return nil;
  }
  
  UIViewController* viewController = [[UIViewController alloc] init];
  
  UIImageView* imageView = [[UIImageView alloc] initWithImage:image];
  viewController.view = imageView;
  viewController.view.frame = screenBounds;
  
  return viewController;
}

+ (void)showSplashScreenViewController:(UIViewController *)viewController
{
  id<UIApplicationDelegate> appDelegate = [UIApplication sharedApplication].delegate;
  appDelegate.window.rootViewController = viewController;
  [appDelegate.window makeKeyAndVisible];
}

-(NSDictionary*)getAppStyle
{
  return [NSDictionary dictionaryWithDictionary:self.globalAppStyle];
}

-(void)setAppStyle:(NSDictionary*)appStyle
{
  self.globalAppStyle = [NSDictionary dictionaryWithDictionary:appStyle];
  [self applyAppStyle];
  
}

-(void)applyAppStyle {
  id backButtonImage = self.globalAppStyle[@"backButtonImage"];
  UIImage *image = backButtonImage ? [RCTConvert UIImage:backButtonImage] : nil;
  [[UINavigationBar appearance] setBackIndicatorImage:image];
  [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:image];
}


#pragma mark - RCTBridgeDelegate methods

- (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
{
  return self.bundleURL;
}

@end