swift - 类型 'Any' 的值没有成员 'valueForKeyPath'

Question

我正在寻找其他堆栈溢出问题，但似乎它不适用于我的情况。

我正在制作 YouTube 应用，我的代码如下。

     if let JSON = response.result.value as? NSDictionary{

            var arrayOfVideos = [Video]()

            for video in JSON["items"] as! NSArray{
                print(video)

                //Create video onjects off of the JSON response
                let videoObj = Video()
      //I got errors following part
                videoObj.videoId = video.valueForKeyPath("snippet.resourceId.videoId") as! String
                videoObj.videoTitle = video.valueForKeyPath("snippet.title") as! String
                videoObj.videoDescription = video.valueForKeyPath("snippet.description") as! String
                videoObj.videoThumbnailUrl = video.valueForKeyPath("snippet.thumbnails.maxres.url") as! String

                arrayOfVideos.append(videoObj)
            }

            self.videoArray = arrayOfVideos
        }else{
            print("couldn't get video information")
        }

我还有一个视频类，它定义标题、描述和缩略图。

class Video: NSObject {

 var videoId:String = ""
 var videoTitle:String = ""
 var videoDescription:String = ""
 var videoThumbnailUrl:String = ""
}

我得到了这些错误。

Value of type 'Any' has no member 'valueForKeyPath'

还有这个

Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

我很感激任何帮助。预先感谢您。

Answer 1

你可以试试

if let JSON = response.result.value as? [String:Any] {

   var arrayOfVideos = [Video]()

   if let videos = JSON["items"] as? [[String:Any]] {

      for video in videos {

          let videoObj = Video()

          if let videoId = video["snippet.resourceId.videoId"] as? String {

              videoObj.videoId = videoId 
          }
          if let videoTitle = video["snippet.title"] as? String {

              videoObj.videoTitle = videoTitle
          }
          if let videoDescription = video["snippet.description"] as? String {

              videoObj.videoDescription = videoDescription
          }
          if let videoThumbnailUrl = video["snippet.thumbnails.maxres.url"] as? String {

              videoObj.videoThumbnailUrl = videoThumbnailUrl
          }

          arrayOfVideos.append(videoObj)
      }
   }
}