Referral Functionality

- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
            options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {
   
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"ABC://"]]) {
        NSDictionary *dictCustom = [[NSDictionary alloc]init];
        NSLog(@"url recieved: %@", url);
        NSLog(@"query string: %@", [url query]);
        NSLog(@"host: %@", [url host]);
        NSLog(@"url path: %@", [url path]);
        dictCustom = [self parseQueryString:[url query]];
        NSLog(@"query dict: %@", dictCustom);
        NSUserDefaults *defUser = [NSUserDefaults standardUserDefaults];
        NSMutableDictionary*  registerDict = [defUser valueForKey:kReferralKey];
        
        if(registerDict.count == 0) {
            [defUser removeObjectForKey:kReferralKey ];
            [defUser setObject:[dictCustom mutableCopy] forKey:kReferralKey];
        }
    }
    
    return NO;
}
- (NSDictionary *)parseQueryString:(NSString *)query {
    NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithCapacity:6] ;
    NSArray *pairs = [query componentsSeparatedByString:@"&"];
    
    for (NSString *pair in pairs)
        {
        NSArray *elements = [pair componentsSeparatedByString:@"="];
        NSString *key = [[elements objectAtIndex:0] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        NSString *val = [[elements objectAtIndex:1] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        
        [dict setObject:val forKey:key];
        }
    return dict;
}


NOTE: go to -> info -> URL types
add 
identifire abc.abc.com
URL schemes ABC
Role -> viewer