EBUIManager.h

#import <Foundation/Foundation.h>

@interface EBUIManager : NSObject

+ (instancetype)sharedInstance;
- (void)addValue:(id)value forKey:(NSString *)key;

@end

EBUIManager.m

#import "EBUIManager.h"

@implementation EBUIManager

NSMutableDictionary *registry;

+ (instancetype)sharedInstance {
    static EBUIManager *sharedInstance = nil;
    @synchronized (self) {
        if (!sharedInstance) {
            sharedInstance = [[self alloc] init];
            registry = [NSMutableDictionary new];
        }
    }
    return sharedInstance;
}

- (void)addValue:(id)value forKey:(NSString *)key {
    [registry setValue:value forKey:key];
}

@end