clean top bar background component

lib/ios/RNNRootViewController.m

         reactView.backgroundColor = UIColor.clearColor;
 		titleView.backgroundColor = UIColor.clearColor;
 		self.navigationItem.titleView = titleView;
+	} if ([self.navigationItem.title isKindOfClass:[RNNCustomTitleView class]]) {
+		self.navigationItem.title = nil;
 	}
 }
 
 		reactView.backgroundColor = UIColor.clearColor;
 		titleView.backgroundColor = UIColor.clearColor;
 		[self.navigationController.navigationBar addSubview:titleView];
+	} else if ([[self.navigationController.navigationBar.subviews lastObject] isKindOfClass:[RNNCustomTitleView class]]) {
+		[[self.navigationController.navigationBar.subviews lastObject] removeFromSuperview];
 	}
 }
 
 		RNNCustomTitleView *titleView = [[RNNCustomTitleView alloc] initWithFrame:self.navigationController.navigationBar.bounds subView:reactView alignment:@"fill"];
 		[self.navigationController.navigationBar insertSubview:titleView atIndex:1];
 		self.navigationController.navigationBar.clipsToBounds = YES;
+	} else if ([[self.navigationController.navigationBar.subviews objectAtIndex:1] isKindOfClass:[RNNCustomTitleView class]]) {
+		[[self.navigationController.navigationBar.subviews objectAtIndex:1] removeFromSuperview];
+		self.navigationController.navigationBar.clipsToBounds = NO;
 	}
 }
 

lib/ios/RNNTopBarOptions.m

 
 - (instancetype)initWithDict:(NSDictionary *)dict {
 	self = [super initWithDict:dict];
-	self.title = [RNNTitleOptions new];
-	self.background = [RNNBackgrounOptions new];
+	self.title = [[RNNTitleOptions alloc] initWithDict:dict[@"title"]];
+	self.background = [[RNNBackgrounOptions alloc] initWithDict:dict[@"background"]];
 	
 	return self;
 }

lib/ios/ReactNativeNavigationTests/RNNNavigationOptionsTest.m

 	XCTAssertTrue([options isKindOfClass:[RNNNavigationOptions class]]);
 }
 - (void)testAddsStyleFromDictionaryWithInit {
-	RNNNavigationOptions* options = [[RNNNavigationOptions alloc] initWithDict:@{@"topBar": @{@"backgroundColor" : @(0xff0000ff)}}];
-	XCTAssertTrue(options.topBar.backgroundColor);
+	RNNNavigationOptions* options = [[RNNNavigationOptions alloc] initWithDict:@{@"topBar": @{@"background" : @{@"color" : @(0xff0000ff)}}}];
+	XCTAssertTrue(options.topBar.background.color);
 }
 
 - (void)testChangeRNNNavigationOptionsDynamically {
-	RNNNavigationOptions* options = [[RNNNavigationOptions alloc] initWithDict:@{@"topBar": @{@"backgroundColor" : @(0xff0000ff)}}];
+	RNNNavigationOptions* options = [[RNNNavigationOptions alloc] initWithDict:@{@"topBar": @{@"background" : @{@"color" : @(0xff0000ff)}}}];
 	NSDictionary* dynamicOptions = @{@"topBar": @{@"textColor" : @(0xffff00ff), @"title" : @{@"text": @"hello"}}};
 	[options mergeWith:dynamicOptions];
 	XCTAssertTrue([options.topBar.title.text isEqual:@"hello"]);
 }
 
 - (void)testChangeRNNNavigationOptionsWithInvalidProperties {
-	RNNNavigationOptions* options = [[RNNNavigationOptions alloc] initWithDict:@{@"topBar": @{@"backgroundColor" : @(0xff0000ff)}}];
+	RNNNavigationOptions* options = [[RNNNavigationOptions alloc] initWithDict:@{@"topBar": @{@"background" : @{@"color" : @(0xff0000ff)}}}];
 	NSDictionary* dynamicOptions = @{@"topBar": @{@"titleeeee" : @"hello"}};
 	XCTAssertNoThrow([options mergeWith:dynamicOptions]);
 }

lib/ios/ReactNativeNavigationTests/RNNRootViewControllerTest.m

 
 -(void)testTopBarBackgroundColor_validColor{
 	NSNumber* inputColor = @(0xFFFF0000);
-	self.options.topBar.backgroundColor = inputColor;
+	self.options.topBar.background.color = inputColor;
 	__unused RNNNavigationController* nav = [[RNNNavigationController alloc] initWithRootViewController:self.uut];
 	[self.uut viewWillAppear:false];
 	UIColor* expectedColor = [UIColor colorWithRed:1 green:0 blue:0 alpha:1];
 
 -(void)testTopBarBackgroundColorWithoutNavigationController{
 	NSNumber* inputColor = @(0xFFFF0000);
-	self.options.topBar.backgroundColor = inputColor;
+	self.options.topBar.background.color = inputColor;
 	
 	XCTAssertNoThrow([self.uut viewWillAppear:false]);
 }