存储敏感信息，token、密码

使用钥匙串
KeychainItemWrapper

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#pragma mark - keychain读取
- (IBAction)read {
    
    KeychainItemWrapper *wrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@"Username"accessGroup:nil];
    NSLog(@"pwd = %@,account = %@",[wrapper objectForKey:(__bridge id)kSecValueData],[wrapper objectForKey:(__bridge id)kSecAttrAccount]);
    
}
#pragma mark - keychain存储
- (void)save {
    
    KeychainItemWrapper *wrapper = [[KeychainItemWrapper alloc]initWithIdentifier:@"Username"accessGroup:nil];
    //保存帐号
    [wrapper setObject:@"ly" forKey:(__bridge id)kSecAttrAccount];
    //保存密码
    [wrapper setObject:@"123456" forKey:(__bridge id)kSecValueData];
    
    [wrapper setObject:@"aaaaaa" forKey:(__bridge id)kSecAttrTokenID];
}

demo地址:https://github.com/zhangjie579/LyNetWorkDemo