How to add parameter to Almofire request

问题

Disclaimer: I'm new to iOS programming, so this question is probably as simple as it looks. It's not a trick question!

I've a Swift project that uses Almofire to send HTTP requests. I want to add a parameter to the query string for every single request made.

So, I want to add mykey=myval to every request.

• EG: http://example.com/index -> http://example.com/index?mykey=myval
• EG: http://example.com/index?key=val -> http://example.com/index?key=val&mykey=myval

I have found that all requests seem to go through

public func request(URLRequest: URLRequestConvertible) -> Request {
    return Manager.sharedInstance.request(URLRequest.URLRequest)
}

in a file named Almofire.swift

and also through

public func request(URLRequest: URLRequestConvertible) -> Request {
    var dataTask: NSURLSessionDataTask?
    dispatch_sync(queue) {
        dataTask = self.session.dataTaskWithRequest(URLRequest.URLRequest)
    }

    let request = Request(session: session, task: dataTask!)
    delegate[request.delegate.task] = request.delegate

    if startRequestsImmediately {
        request.resume()
    }

    return request
}

in a file named Manager.swift, so I'm presuming I need to add a bit of code here. Due to my lack of Swift knowledge I've spend hours experimenting but no joy - only exceptions.

Does anyone know how I can add a parameter to all requests?

回答1:

You don't need to change anything in Alamofire's code. Instead you can use the URLRequestConvertible protocol to encapsulate your URLs and parameter in an enum:

enum Router: URLRequestConvertible {
    static let baseURLString = "https://example.com" // define your base URL here
    static var defaultParams = ["myKey": "myValue"] // set the default params here

    // define a case for every request you need
    case Index
    case Endpoint1(param: String)
    case Endpoint2(param1: String, param2: String)

    var URLRequest: NSMutableURLRequest {
        let result: (path: String, parameters: [String: AnyObject]) = {
            // set the path and params for each request
            switch self {
            case .Index:
                return ("/index", Router.defaultParams)
            case .Endpoint1(let param):
                var params = Router.defaultParams
                params.updateValue(param, forKey: "key")
                return ("/endpoint", params)
            case .Endpoint2(let param1, let param2):
                var params = Router.defaultParams
                params.updateValue(param1, forKey: "key1")
                params.updateValue(param2, forKey: "key2")
                return ("/endpoint2", params)
            }
        }()

        // create the URL and the request
        let URL = NSURL(string: Router.baseURLString)!
        let URLRequest = NSURLRequest(URL: URL.URLByAppendingPathComponent(result.path))
        let encoding = Alamofire.ParameterEncoding.URL

        return encoding.encode(URLRequest, parameters: result.parameters).0
    }
}

Then you can call your requests in the following matter:

// sends a request to 'https://example.com/index?myKey=myValue'
Alamofire.request(Router.Index).response { (request, urlResponse, data, error) -> Void in
    // handle response
}

// sends a request to 'https://example.com/endpoint?key=value&myKey=myValue'
Alamofire.request(Router.Endpoint1(param: "value")).response { (request, urlResponse, data, error) -> Void in
    // handle response
}

// sends a request to 'https://example.com/endpoint2?key1=value1&key2=value2&myKey=myValue'
Alamofire.request(Router.Endpoint2(param1: "value1", param2: "value2")).response { (request, urlResponse, data, error) -> Void in
    // handle response
}

回答2:

I used the Routing Request, You can check the refreshToken method

enum UserRouter: URLRequestConvertible {

    case loginUser(parameters: Parameters)
    case logoutUser(query: String)
    case refreshToken(parameters: Parameters)

    static let baseURLString = Constants.baseURL

    var method: HTTPMethod {
        switch self {
        case .loginUser:
            return .post

        case .logoutUser:
            return .post

        case .refreshToken:
            return .get
        }
    }

    var path: String {
        switch self {
        case .logoutUser:
            return "logout"

        case .loginUser:
            return "login"

        case .refreshToken:
            return "token/refresh"

        }
    }

    // MARK: URLRequestConvertible
    func asURLRequest() throws -> URLRequest {
        let url = try UserRouter.baseURLString.asURL()

        var urlRequest = URLRequest(url: url.appendingPathComponent(path))
        urlRequest.httpMethod = method.rawValue

        switch self {
        case .refreshToken(let parameters):
            urlRequest = try URLEncoding.default.encode(urlRequest, with: parameters)
        case .loginUser(let parameters):
            urlRequest = try URLEncoding.default.encode(urlRequest, with: parameters)

        default:
            break
        }

        return urlRequest
    }
}

回答3:

Simple request ->

func someFunction()
{
    Alamofire.request(.GET, "apiName", parameters:["Key":"Value"])
        .response { request, response, data, error in
            if error == nil {
                print(request)
                print(response)
            }
            else {
                //Display Error Message
                print(error)
            }

    }
}

来源：https://stackoverflow.com/questions/33038183/how-to-add-parameter-to-almofire-request