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

#import "RNNOptions.h"

@implementation RNNOptions

-(instancetype)initWithDict:(NSDictionary *)dict {
	self = [super init];
	[self mergeWith:dict];
	return self;
}

- (void)applyOn:(UIViewController *)viewController defaultOptions:(RNNOptions *)defaultOptions {
	[defaultOptions applyOn:viewController];
	[self applyOn:viewController];
}

-(void)mergeWith:(NSDictionary *)otherOptions {
	for (id key in otherOptions) {
		if ([self hasProperty:key]) {
			if ([[self valueForKey:key] isKindOfClass:[RNNOptions class]]) {
				RNNOptions* options = [self valueForKey:key];
				[options mergeWith:[otherOptions objectForKey:key]];
			} else {
				[self setValue:[otherOptions objectForKey:key] forKey:key];
			}
		}
	}
}

-(void)mergeIfEmptyWith:(NSDictionary *)otherOptions {
	for (id key in otherOptions) {
		if ([self hasProperty:key]) {
			if ([[self valueForKey:key] isKindOfClass:[RNNOptions class]]) {
				RNNOptions* options = [self valueForKey:key];
				[options mergeIfEmptyWith:[otherOptions objectForKey:key]];
			} else if (![self valueForKey:key]) {
				[self setValue:[otherOptions objectForKey:key] forKey:key];
			}
		}
	}
}

- (BOOL)hasProperty:(NSString*)propName {
	return [self respondsToSelector:NSSelectorFromString(propName)];
}

@end