Question

我通过 Alamofire 从我的VM服务器获取密码盐时遇到了麻烦。我向服务器发出请求，它应该返回给我盐，所以我可以将我的密码加密，哈希并将其发送回服务器。

问题在于我不明白如何将Alamofire收到的盐保存到变量中，因此我可以将其添加到密码中并将其哈希：

let salted_password = user_password + salt
let hash = salted_password.sha1()

其中user_password是用户输入密码字段的内容，salt是我从Alamofire盐请求中获得的内容。

这是我的代码：

func getSalt(completionHandler: @escaping (DataResponse<String>, Error?) -> Void) {

        Alamofire.request("http://192.168.0.201/salt", method: .post, parameters: salt_parameters).responseString { response in

        switch response.result {
        case .success(let value):
            completionHandler(response as DataResponse<String>, nil)
        case .failure(let error):
            completionHandler("Failure", error)
            }
        }
    }

    let salt = getSalt { response, responseError in

        return response.result.value!
    }

它给了我以下错误：

Binary operator '+' cannot be applied to operands of type 'String' and '()'.

那么可以将请求值保存到变量中吗？我该怎么办？

感谢您的关注。

Answer 1

The problem here is because of how you implemented your completion block

For example:

func someAsynchronousCall(a: Int, b: Int, @escaping block: (_ result: Int) -> Void) {
    ... some code here
    ... { 
        // let's just say some async call was done and this code is called after the call was done
        block(a + b)
    }
}

To use this code it would look like this:

var answer: Int = 0
someAsynchronousCall(100, b: 200) { result in // the `result` is like what you're returning to the user since API calls need to be called asynchronously you do it like this rather than creating a function that has a default return type.
    answer = result
    print(answer)
}
print(answer)

The print would look like this

0
300

Since we declared answer as 0 it printed that first since the async call wasn't done yet, after the async call was done (usually a few milliseconds after) it then printed 300

So all in all your code should look something like this

var salt: String?
getSalt { response, responseError in 
    salt = response.result.value 
}

将Alamofire请求数据保存到变量

1 个答案: