Adresses #3054

lib/ios/RNNButtonOptions.h

 @property (nonatomic, strong) NSNumber* fontSize;
 @property (nonatomic, strong) NSNumber* color;
 @property (nonatomic, strong) NSNumber* disabledColor;
+@property (nonatomic, strong) NSNumber* icon;
+@property (nonatomic, strong) NSString* text;
+@property (nonatomic, strong) NSNumber* enabled;
 
 @end

lib/ios/RNNNavigationButtons.h

 
 -(instancetype)initWithViewController:(RNNRootViewController*)viewController;
 
--(void)applyLeftButtons:(NSArray*)leftButtons rightButtons:(NSArray*)rightButtons defaultButtonStyle:(RNNButtonOptions *)defaultButtonStyle;
+-(void)applyLeftButtons:(NSArray*)leftButtons rightButtons:(NSArray*)rightButtons defaultLeftButtonStyle:(RNNButtonOptions *)defaultLeftButtonStyle defaultRightButtonStyle:(RNNButtonOptions *)defaultRightButtonStyle;
 
 @end
 

lib/ios/RNNNavigationButtons.m

 @property (weak, nonatomic) RNNRootViewController* viewController;
 @property (strong, nonatomic) NSArray* rightButtons;
 @property (strong, nonatomic) NSArray* leftButtons;
-@property (strong, nonatomic) RNNButtonOptions* defaultButtonStyle;
+@property (strong, nonatomic) RNNButtonOptions* defaultLeftButtonStyle;
+@property (strong, nonatomic) RNNButtonOptions* defaultRightButtonStyle;
 
 @end
 
 	return self;
 }
 
--(void)applyLeftButtons:(NSArray*)leftButtons rightButtons:(NSArray*)rightButtons defaultButtonStyle:(RNNButtonOptions *)defaultButtonStyle {
-	_defaultButtonStyle = defaultButtonStyle;
+- (void)applyLeftButtons:(NSArray *)leftButtons rightButtons:(NSArray *)rightButtons defaultLeftButtonStyle:(RNNButtonOptions *)defaultLeftButtonStyle defaultRightButtonStyle:(RNNButtonOptions *)defaultRightButtonStyle {
+	_defaultLeftButtonStyle = defaultLeftButtonStyle;
+	_defaultRightButtonStyle = defaultRightButtonStyle;
 	if (leftButtons) {
-		[self setButtons:leftButtons side:@"left" animated:NO];
+		[self setButtons:leftButtons side:@"left" animated:NO defaultStyle:_defaultLeftButtonStyle];
 	}
 	
 	if (rightButtons) {
-		[self setButtons:rightButtons side:@"right" animated:NO];
+		[self setButtons:rightButtons side:@"right" animated:NO defaultStyle:_defaultRightButtonStyle];
 	}
 }
 
--(void)setButtons:(NSArray*)buttons side:(NSString*)side animated:(BOOL)animated {
+-(void)setButtons:(NSArray*)buttons side:(NSString*)side animated:(BOOL)animated defaultStyle:(RNNButtonOptions *)defaultStyle {
 	NSMutableArray *barButtonItems = [NSMutableArray new];
 	NSArray* resolvedButtons = [self resolveButtons:buttons];
 	for (NSDictionary *button in resolvedButtons) {
-		RNNUIBarButtonItem* barButtonItem = [self buildButton:button];
+		RNNUIBarButtonItem* barButtonItem = [self buildButton:button defaultStyle:defaultStyle];
 		if(barButtonItem) {
 			[barButtonItems addObject:barButtonItem];
 		}
 	}
 }
 
--(RNNUIBarButtonItem*)buildButton: (NSDictionary*)dictionary {
+-(RNNUIBarButtonItem*)buildButton: (NSDictionary*)dictionary defaultStyle:(RNNButtonOptions *)defaultStyle {
 	NSString* buttonId = dictionary[@"id"];
-	NSString* title = dictionary[@"text"];
+	NSString* title = [self getValue:dictionary[@"text"] withDefault:defaultStyle.text];
 	NSDictionary* component = dictionary[@"component"];
 	
 	if (!buttonId) {
 	}
 	
 	UIImage* iconImage = nil;
-	id icon = dictionary[@"icon"];
+	id icon = [self getValue:dictionary[@"icon"] withDefault:defaultStyle.icon];
 	if (icon) {
 		iconImage = [RCTConvert UIImage:icon];
 	}
 	barButtonItem.target = self;
 	barButtonItem.action = @selector(onButtonPress:);
 	
-	NSNumber *enabled = dictionary[@"enabled"];
+	NSNumber *enabled = [self getValue:dictionary[@"enabled"] withDefault:defaultStyle.enabled];
 	BOOL enabledBool = enabled ? [enabled boolValue] : YES;
 	[barButtonItem setEnabled:enabledBool];
 	
-	NSNumber *disableIconTintString = dictionary[@"disableIconTint"];
-	BOOL disableIconTint = disableIconTintString ? [disableIconTintString boolValue] : NO;
-	if (disableIconTint) {
-		[barButtonItem setImage:[barButtonItem.image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
-	}
-	
 	NSMutableDictionary* textAttributes = [[NSMutableDictionary alloc] init];
 	NSMutableDictionary* disabledTextAttributes = [[NSMutableDictionary alloc] init];
 	
-	UIColor* color = [self color:dictionary[@"color"] defaultColor:_defaultButtonStyle.color];
+	UIColor* color = [self color:dictionary[@"color"] defaultColor:defaultStyle.color];
 	if (color) {
 		[textAttributes setObject:color forKey:NSForegroundColorAttributeName];
+		[barButtonItem setImage:[iconImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
+		[barButtonItem setTintColor:color];
 	}
 	
-	UIColor* disabledColor = [self color:dictionary[@"disabledColor"] defaultColor:_defaultButtonStyle.disabledColor];;
+	UIColor* disabledColor = [self color:dictionary[@"disabledColor"] defaultColor:defaultStyle.disabledColor];;
 	if (disabledColor) {
 		UIColor *color = disabledColor;
 		[disabledTextAttributes setObject:color forKey:NSForegroundColorAttributeName];
 	}
 	
-	NSNumber* fontSize = [self fontSize:dictionary[@"fontSize"] defaultFontSize:_defaultButtonStyle.fontSize];
-	NSString* fontFamily = [self fontFamily:dictionary[@"fontFamily"] defaultFontFamily:_defaultButtonStyle.fontFamily];
+	NSNumber* fontSize = [self fontSize:dictionary[@"fontSize"] defaultFontSize:defaultStyle.fontSize];
+	NSString* fontFamily = [self fontFamily:dictionary[@"fontFamily"] defaultFontFamily:defaultStyle.fontFamily];
 	UIFont *font = nil;
 	if (fontFamily) {
 		font = [UIFont fontWithName:fontFamily size:[fontSize floatValue]];
 	}
 }
 
+- (id)getValue:(id)value withDefault:(id)defaultValue {
+	return value ? value : defaultValue;
+}
+
 -(void)onButtonPress:(RNNUIBarButtonItem*)barButtonItem {
 	[self.viewController.eventEmitter sendOnNavigationButtonPressed:self.viewController.componentId buttonId:barButtonItem.buttonId];
 }

lib/ios/RNNTopBarOptions.h

 @property (nonatomic, strong) RNNSubtitleOptions* subtitle;
 @property (nonatomic, strong) RNNBackgroundOptions* background;
 @property (nonatomic, strong) RNNBackButtonOptions* backButton;
-@property (nonatomic, strong) RNNButtonOptions* button;
+@property (nonatomic, strong) RNNButtonOptions* leftButtonStyle;
+@property (nonatomic, strong) RNNButtonOptions* rightButtonStyle;
 @property (nonatomic, strong) NSNumber* searchBar;
 @property (nonatomic, strong) NSNumber* searchBarHiddenWhenScrolling;
 @property (nonatomic, strong) NSString* searchBarPlaceholder;

lib/ios/RNNTopBarOptions.m

 	
 	if (self.rightButtons || self.leftButtons) {
 		_navigationButtons = [[RNNNavigationButtons alloc] initWithViewController:(RNNRootViewController*)viewController];
-		[_navigationButtons applyLeftButtons:self.leftButtons rightButtons:self.rightButtons defaultButtonStyle:_button];
+		[_navigationButtons applyLeftButtons:self.leftButtons rightButtons:self.rightButtons defaultLeftButtonStyle:self.leftButtonStyle defaultRightButtonStyle:self.rightButtonStyle];
+	}
+}
+
+- (void)setLeftButtons:(id)leftButtons {
+	if ([leftButtons isKindOfClass:[NSArray class]]) {
+		_leftButtons = leftButtons;
+	} else if ([leftButtons isKindOfClass:[NSDictionary class]]) {
+		if (leftButtons[@"id"]) {
+			_leftButtons = @[leftButtons];
+		} else {
+			[_leftButtonStyle mergeWith:leftButtons];
+		}
+	}
+}
+
+- (void)setRightButtons:(id)rightButtons {
+	if ([rightButtons isKindOfClass:[NSArray class]]) {
+		_rightButtons = rightButtons;
+	} else if ([rightButtons isKindOfClass:[NSDictionary class]]) {
+		if (rightButtons[@"id"]) {
+			_rightButtons = @[rightButtons];
+		} else {
+			[_rightButtonStyle mergeWith:rightButtons];
+		}
 	}
 }