Question

我需要下载一个位于服务器上的文件。我有一个网址，如：http://www.myhosting.com/1.txt 我需要将它下载到我的iOS设备，或者至少从它上面读取文本。我的项目是SWIFT。现在我使用下面的代码：

let requestURL: NSURL = NSURL(string: "http://www.myhosting.com/1.txt")!
        let urlRequest: NSMutableURLRequest = NSMutableURLRequest(URL: requestURL)
        let session = NSURLSession.sharedSession()
        let task = session.dataTaskWithRequest(urlRequest) {
            (data, response, error) -> Void in

            let httpResponse = response as! NSHTTPURLResponse
            let statusCode = httpResponse.statusCode

            if (statusCode == 200) {
                self.dtlbl.text = "Everyone is fine, file downloaded successfully."

            }
        }

        task.resume()

但它不起作用。我的应用程序在运行此代码后关闭。我试着读它，但它也不好意思..

请，需要任何帮助！不知道该怎么办。还有一个想法 - 我应该使用任何边框架。

Answer 1

问题是unwrap响应而不检查它是否为零。

let requestURL: NSURL = NSURL(string: "http://www.myhosting.com/1.txt")!
let urlRequest: NSMutableURLRequest = NSMutableURLRequest(URL: requestURL)
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(urlRequest) {
  (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
  if let httpResponse = response as? NSHTTPURLResponse {
    let statusCode = httpResponse.statusCode
    if (statusCode == 200) {
      self.dtlbl.text = "Everyone is fine, file downloaded successfully."
    }
  }
}
task.resume()

iOS Swift下载文件

1 个答案: