Parsing JSON to a predefined class in Objective C

Question

I have a json string like:

{
  \"a\":\"val1\",
  \"b\":\"val2\",
  \"c\":\"val3\"
}

And I have an objective C header file like:

Answer 1

- (id)initWithDictionary:(NSDictionary *)dictionary {
    if (self = [super init]) {
        _a = [dictionary objectForKey:@"a"];
        _b = [dictionary objectForKey:@"b"];
        _c = [dictionary objectForKey:@"c"];
    }
    return self;
}