react-native-navigation/lib/ios/RNNTopBarOptions.m

#import "RNNTopBarOptions.h"
#import "RNNNavigationButtons.h"
#import "RNNCustomTitleView.h"

extern const NSInteger BLUR_TOPBAR_TAG;

@interface RNNTopBarOptions ()

@property (nonatomic, strong) NSMutableDictionary* originalTopBarImages;
@property (nonatomic, strong) RNNNavigationButtons* navigationButtons;

@end

@implementation RNNTopBarOptions

- (instancetype)initWithDict:(NSDictionary *)dict {
	self = [super initWithDict:dict];
	
	self.title.subtitle = self.subtitle;
	
	return self;
}

- (void)mergeWith:(NSDictionary *)otherOptions {
	[super mergeWith:otherOptions];
	self.title.subtitle = self.subtitle;
}

- (void)applyOn:(UIViewController*)viewController {
	[self.title applyOn:viewController];
	[self.largeTitle applyOn:viewController];
	[self.background applyOn:viewController];
	[self.backButton applyOn:viewController];
	
	if (@available(iOS 11.0, *)) {
		if ([self.searchBar boolValue] && !viewController.navigationItem.searchController) {
			UISearchController *search = [[UISearchController alloc]initWithSearchResultsController:nil];
			search.dimsBackgroundDuringPresentation = NO;
			if ([viewController conformsToProtocol:@protocol(UISearchResultsUpdating)]) {
				[search setSearchResultsUpdater:((UIViewController <UISearchResultsUpdating> *) viewController)];
			}
			if (self.searchBarPlaceholder) {
				search.searchBar.placeholder = self.searchBarPlaceholder;
			}
			viewController.navigationItem.searchController = search;
			// enable it back if needed on componentDidAppear
			viewController.navigationItem.hidesSearchBarWhenScrolling = NO;
		}
	}
	
	if (self.visible) {
		[viewController.navigationController setNavigationBarHidden:![self.visible boolValue] animated:[self.animate boolValue]];
	} else {
		[viewController.navigationController setNavigationBarHidden:NO animated:NO];
	}
	
	if (self.hideOnScroll) {
		viewController.navigationController.hidesBarsOnSwipe = [self.hideOnScroll boolValue];
	} else {
		viewController.navigationController.hidesBarsOnSwipe = NO;
	}
	
	if (self.buttonColor) {
		UIColor* buttonColor = [RCTConvert UIColor:self.buttonColor];
		viewController.navigationController.navigationBar.tintColor = buttonColor;
	} else {
		viewController.navigationController.navigationBar.tintColor = nil;
	}
	
	if ([self.blur boolValue]) {
		if (![viewController.navigationController.navigationBar viewWithTag:BLUR_TOPBAR_TAG]) {
			
			[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_TOPBAR_TAG;
			[viewController.navigationController.navigationBar insertSubview:blur atIndex:0];
			[viewController.navigationController.navigationBar sendSubviewToBack:blur];
		}
	} else {
		UIView *blur = [viewController.navigationController.navigationBar viewWithTag:BLUR_TOPBAR_TAG];
		if (blur) {
			[viewController.navigationController.navigationBar setBackgroundImage: nil forBarMetrics:UIBarMetricsDefault];
			viewController.navigationController.navigationBar.shadowImage = nil;
			[blur removeFromSuperview];
		}
	}
	
	void (^disableTopBarTransparent)(void) = ^ {
		UIView *transparentView = [viewController.navigationController.navigationBar viewWithTag:TOP_BAR_TRANSPARENT_TAG];
		if (transparentView){
			[transparentView removeFromSuperview];
			[viewController.navigationController.navigationBar setBackgroundImage:self.originalTopBarImages[@"backgroundImage"] forBarMetrics:UIBarMetricsDefault];
			viewController.navigationController.navigationBar.shadowImage = self.originalTopBarImages[@"shadowImage"];
			self.originalTopBarImages = nil;
		}
	};
	
	if (self.transparent) {
		if ([self.transparent boolValue]) {
			if (![viewController.navigationController.navigationBar viewWithTag:TOP_BAR_TRANSPARENT_TAG]){
				[self storeOriginalTopBarImages:viewController];
				[viewController.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
				viewController.navigationController.navigationBar.shadowImage = [UIImage new];
				UIView *transparentView = [[UIView alloc] initWithFrame:CGRectZero];
				transparentView.tag = TOP_BAR_TRANSPARENT_TAG;
				[viewController.navigationController.navigationBar insertSubview:transparentView atIndex:0];
			}
		} else {
			disableTopBarTransparent();
		}
	} else {
		disableTopBarTransparent();
	}
	
	if (self.translucent) {
		viewController.navigationController.navigationBar.translucent = [self.translucent boolValue];
	} else {
		viewController.navigationController.navigationBar.translucent = NO;
	}
	
	if (self.drawBehind) {
		if ([self.drawBehind boolValue]) {
			viewController.edgesForExtendedLayout |= UIRectEdgeTop;
		} else {
			viewController.edgesForExtendedLayout &= ~UIRectEdgeTop;
		}
	} else {
		viewController.edgesForExtendedLayout = UIRectEdgeAll;
	}
	
	if (self.noBorder) {
		if ([self.noBorder boolValue]) {
			viewController.navigationController.navigationBar
			.shadowImage = [[UIImage alloc] init];
		} else {
			viewController.navigationController.navigationBar
			.shadowImage = nil;
		}
	}
	
	if (self.testID) {
		viewController.navigationController.navigationBar.accessibilityIdentifier = self.testID;
	}
	
	if (self.rightButtons || self.leftButtons) {
		_navigationButtons = [[RNNNavigationButtons alloc] initWithViewController:(RNNRootViewController*)viewController];
		[_navigationButtons applyLeftButtons:self.leftButtons rightButtons:self.rightButtons];
	}

	UIImage *image = self.backButton.image ? [RCTConvert UIImage:self.backButton.image] : nil;
	[viewController.navigationController.navigationBar setBackIndicatorImage:image];
	[viewController.navigationController.navigationBar setBackIndicatorTransitionMaskImage:image];
	
	if (![self.backButton.visible boolValue]) {
		self.backButton.title = @"";
	}
	
	if (self.backButton.title) {
		UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:self.backButton.title
																	 style:UIBarButtonItemStylePlain
																	target:nil
																	action:nil];
		
		viewController.navigationItem.backBarButtonItem = backItem;
	}
	
	viewController.navigationItem.hidesBackButton = ![self.backButton.visible boolValue];
}

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

@end