I have a Dictionary<ObjcType, SwiftType> that I have to serialize to and deserialize from JSON. SwiftType conforms to Codable. ObjcType is a class written in Objective-C (used by one of the libraries I heavily depend on, so cannot change it to be in Swift). All properties of ObjcType are either NSString or BOOL.

I did some search and added these functions to ObjcType, to give it some semblance of serialization:

-(NSString*)GetJSON{
    NSError *writeError = nil;

    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:self options:NSJSONWritingPrettyPrinted error:&writeError];

    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

    return jsonString;
}

- (instancetype)initWithObject:(NSString *)jsonString {
    self = [super init];
    if (self != nil)
    {
        NSData* jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
        
        NSError *error = nil;
        NSDictionary  *object = [NSJSONSerialization
                                 JSONObjectWithData:jsonData
                                 options:0
                                 error:&error];
        for (NSString *dictionaryKey in object) {
            self.field1 = [[object valueForKey:dictionaryKey] objectForKey:@"field1"];
            self.field2 = [[object valueForKey:dictionaryKey] objectForKey:@"field2"];
            self.field3 = [[object valueForKey:dictionaryKey] objectForKey:@"field3"];
        }
    }
    return self;
}

So now my ObjcType can create its own text to put into that JSON.
But I cannot figure out how to make a wrapper that will encodedecode this dictionary. Any help?

P.S. even better is it could work with OrderedDictionary from OrderedCollections module instead of normal Dictionary.