swift - 使用 alamofire 排队

Question

我在使用 Alamofire 时遇到任务执行问题我使用了两次 Alamofire，第一次是收集数据( token )，然后我将使用它来发送我的 Post 请求。

我的两次请求之间的问题，数据的恢复是在第二次请求之后完成的。

import Foundation
import Alamofire
import SwiftyJSON

class Helper {
    func alomofireGet(URL: String) -> JSON {
        let queue = DispatchQueue(label: "com.test.com", qos: .background, attributes: .concurrent)
        var contenuJSON = JSON()
        Alamofire.request(URL, method: .get).responseJSON(queue: queue) { (reponse) in
            if reponse.result.isSuccess {
                contenuJSON = JSON(reponse.result.value!)
                print(contenuJSON)
            }
            else {
                contenuJSON = JSON(reponse.result.error!)
            }
        }
        return contenuJSON
    }
    func alomofirePost(URL: String, Paramaters: Dictionary<String, Any>) -> JSON {
        var contenuJSON = JSON()
        Alamofire.request(URL, method: .post, parameters: Paramaters, encoding: JSONEncoding.default).responseJSON { (reponse) in
            if reponse.result.isSuccess {
                contenuJSON = JSON(reponse.result.value!)
            }
            else {
                contenuJSON = JSON(reponse.result.error!)
            }
        }
        return contenuJSON
    }
}

在新文件中 = 与内容 token 的差异

let request = Helper()
@IBOutlet weak var emailText: UITextField!
@IBOutlet weak var passwordText: UITextField!
override func viewDidLoad() {
    super.viewDidLoad()
    self.hideKeyboardWhenTappedAround()
}
@IBAction func login(_ sender: Any) {
    let contenuJSON = request.alomofireGet(URL: "http://192.168.1.7/app_dev.php/login/app")
    print(contenuJSON)
    let token = contenuJSON["csrfToken"].stringValue
    print(token) // /\ EMPTY
    let Paramaters = ["_csrf_token": token, "_password": self.passwordText.text!, "_redirect_url": "", "t_path": "", "_username": self.emailText.text!]
    let contenuRequest = request.alomofirePost(URL: "http://192.168.1.7/app_dev.php/login_check", Paramaters: Paramaters)
    print(token) // /\ FULL /\
}

Answer 1

对 Alamofire 的 API 调用是异步过程，因此您的 alamofireGet 和 alamofirePost 只返回初始化的 json 对象 - JSON() 而不是有没有数据。

解决方案:

您应该使用@escaping 闭包，它将保持控制权，直到您获得第一次 API 调用的结果。

func alomofireGet(URL: String, onCompletion:((JSON) -> Void)) {
    let queue = DispatchQueue(label: "com.test.com", qos: .background, attributes: .concurrent)
    var contentJSON = JSON()
    Alamofire.request(URL, method: .get).responseJSON(queue: queue) { (reponse) in
        // Load contentJSON with data
        if reponse.result.isSuccess {
            contenuJSON = JSON(reponse.result.value!)
        } else {
            contenuJSON = JSON(reponse.result.error!)
        }
        // Send contentJSON via `onCompletion` block
        onCompletion(contenuJSON)
    }
}

func alomofirePost(URL: String, Paramaters: Dictionary<String, Any>, onCompletion: @escaping ((_ response: JSON) -> Void)) {
    var contenuJSON = JSON()
    Alamofire.request(URL, method: .post, parameters: Paramaters, encoding: JSONEncoding.default).responseJSON { (reponse) in
        // Load contentJSON with data
        if reponse.result.isSuccess {
            contenuJSON = JSON(reponse.result.value!)
        } else {
            contenuJSON = JSON(reponse.result.error!)
        }
        // Send contentJSON via `onCompletion` block
        onCompletion(contenuJSON)
    }
}

在您的 View Controller 中调用它:

    let usernameStr = self.emailText.text!
    let passwordStr = self.passwordText.text! 

    Helper().alomofireGet(URL: "http://192.168.1.7/app_dev.php/login/app") { contenuJSON in
        print(contenuJSON)

        DispatchQueue.main.async {
            let token = contenuJSON["csrfToken"].stringValue
            print(token)

            let Paramaters = ["_csrf_token": token, "_password": passwordStr, "_redirect_url": "", "t_path": "", "_username": usernameStr]
            Helper().alomofirePost(URL: "http://192.168.1.7/app_dev.php/login_check", Paramaters: Paramaters) { contenuJSON in
                print(token)
            }
        }

    }