#import "KeychainItemWrapper.h"

    KeychainItemWrapper *keychainItem;

keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"login" accessGroup:nil];

NSString *password = [keychainItem objectForKey:(__bridge id)kSecValueData];
NSString *username = [keychainItem objectForKey:(__bridge id)kSecAttrAccount];

NSString *password = [keychainItem objectForKey:(__bridge id)kSecValueData];
NSString *username = [keychainItem objectForKey:(__bridge id)kSecAttrAccount];

NSString *password = [[NSString alloc] initWithData:[keychainItem objectForKey:(id)kSecValueData] encoding:NSUTF8StringEncoding];
NSString *username = [keychainItem objectForKey:(id)kSecAttrAccount];