检查Http状态Swift4

Question

我对凭据和HttpStatus有点困惑。

我正在使用Swift 4/XCode9 9创建一个登录页面，该页面连接到一个api。以下是我在点击登录按钮时所做的工作：

   @IBAction func loginTapped(_ sender: Any) {

    let loginString = String(format: "%@:%@", usernametext.text!, passwordtext.text!)
    let loginData = loginString.data(using: String.Encoding.utf8)!
    let base64LoginString = loginData.base64EncodedString()
    var Base = base64LoginString

    let url = URL(string: "SOME URL")!
    var request = URLRequest(url: url)
    request.addValue("Basic \(Base)", forHTTPHeaderField: "Authorization")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data, error == nil else {
            print("\(error)")
            return
        }
        if let httpStatus = response as? HTTPURLResponse {
            print("status code = \(httpStatus.statusCode)")
        }
    }
    task.resume()
    view.endEditing(true)
}

一切正常，但我不知道如何检查httpstatus。如果我得到错误的凭据，我想停留在登录页面上，而不是执行下一个视图的segue。

Answer 1

试试这段代码

func checkStatusCode(response:URLResponse?) -> Bool {
        guard let statusCode = (response as? HTTPURLResponse)?.statusCode else {
            print("Invalid Response")
            return false
        }

        if statusCode != 200 {
            print("Invalid File")            
            return false
        }
        return true
    }

用法：

if (self.checkStatusCode(response: response)) { 
    DispatchQueue.main.async {
        self.performSegue(withIdentifier: "showW", sender: self)
    }      
} else {
 //added an alert 
}