Keychain优点：
① 保存的信息不会因App被删除而丢失，在用户重新安装App后依然有效(需要导入Security.framework)
② 不同App共享KeyChain数据
代码实现
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NSString * userName = @"Name"; //用户名
NSString * passWord = @"123456"; //密码
KeychainItemWrapper * keychain = [[KeychainItemWrapper alloc]initWithIdentifier:@"UserKeychain"accessGroup:nil];
//必须设置kSecAttrService，KeyChain内部以kSecAttrAccount与kSecAttrService作为唯一钥匙串标识，两个都必须设置才行
[keychain setObject:@"UserKeychain" forKey:(id)kSecAttrService];
//保存用户名
[keychain setObject:userName forKey:(id)kSecAttrAccount];
//保存密码
[keychain setObject:passWord forKey:(id)kSecValueData];
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取值，取出已保存的用户名、密码
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KeychainItemWrapper * keychain = [[KeychainItemWrapper alloc]initWithIdentifier:@"UserKeychain"accessGroup:nil];
[keychain setObject:@"UserKeychain" forKey:(id)kSecAttrService];
NSString * userName = [keychain objectForKey:(id)kSecAttrAccount];
NSString * password = [keychain objectForKey:(id)kSecValueData];
// 打印数据
NSLog(@"keychain userName = %@",userName);
NSLog(@"keychain password = %@",password);
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