swift - 如何在 Swift 中调用 HTTP Get 并保存到变量中？

Question

我的问题很简单:如何在 Swift 中调用 HTTP GET 请求？我正在尝试从服务器检索特定数据(我有 URL 字符串)，问题是我之前看到的答案没有彻底解释如何请求 HTTP Get 并将检索到的信息保存在变量中以备后用？提前致谢!

这是我目前所拥有的:

       let myURL = NSURL(string:"https://api.thingspeak.com/channels/CHANNEL_ID/last_entry
        _id.txt");

       let request = NSMutableURLRequest(url:myURL! as URL);

        request.httpMethod = "GET"

不确定在请求 GET 之后做什么。

Answer 1

在您的帖子中，您遗漏了实际获取数据的部分。

从文本文件中获取值的代码应如下所示。

var lastID: String?
let myURL = NSURL(string:"https://api.thingspeak.com/channels/1417/last_entry_id.txt");

let request = NSMutableURLRequest(url:myURL! as URL);
//request.httpMethod = "GET" // This line is not need
// Excute HTTP Request
let task = URLSession.shared.dataTask(with: request as URLRequest) {
    data, response, error in

    // Check for error
    if error != nil
    {
        print("error=\(error)")
        return
    }

    // Print out response string
    let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
    print("responseString = \(responseString!)") 
    lastID = "\(responseString!)" // Sets some variable or text field. Not that its unwrapped because its an optional. 
}

task.resume()