title: How to check if something is stored in the iPhone keychain?
body: <p>I have this code currently storing the information into the iPhone keychain. How can I check with a simple if statement if there is something under the same name already stored there to prevent double storage and to tell me if this is the first time the user is using the app?</p>
  
  <pre><code>KeychainItemWrapper* keychain = [[KeychainItemWrapper alloc] initWithIdentifier:@"KeychainTest" accessGroup:nil];
          [keychain setObject:username.text forKey:(__bridge id)(kSecAttrAccount)];
          [keychain setObject:password.text forKey:(__bridge id)(kSecValueData)];
          keychain = nil;
  
          usernameAll = [keychain objectForKey:(__bridge id)kSecAttrAccount];
          passwordAll = [keychain objectForKey:(__bridge id)kSecValueData];
  </code></pre>