Saving Data in the keychain ---- iphone sdk

 Keychain to store usernames and passwords, and since it's stored securely and only accessible to your app

Download Sample code from Apple website sample code 

Add Security.framework 

Add KeychainItemWrapper .h & .m files into your project

 #import the .h file wherever you need to use keychain and then create an instance of this class:

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

(AppLoginItems can be anything you choose to call your Keychain item and you can have multiple items if required)

Then you can set the username and password using:

[keychainItem setObject:@"password you are saving" forKey:kSecValueData];

[keychainItem setObject:@"username you are saving" forKey:kSecAttrAccount];

Get them using:

NSString *password = [keychainItem objectForKey:kSecValueData];

NSString *username = [keychainItem objectForKey:kSecAttrAccount];

Or delete them using:

[keychainItem resetKeychainItem];