YouTube API/JSON/Swift

Question

在我似乎无法弄清楚的事情上需要您的帮助。

我正在尝试通过 API/JSON 显示我当前的 Youtube 视频，当我去构建项目并单击假设在我的视图控制器中构建视频的选项卡时，我在以下位置收到错误：

“线程 1：致命错误：在展开可选值时意外发现 nil”

它突出显示：

对于字典中的项目[“项目”] 为！ NSArray { 打印（项目）

已满：

import UIKit
import Alamofire

protocol VideoModelDelegate {
    func dataReady()
}

class VideoModel: NSObject {

    var videoArray = [Video]()

    var delegate:VideoModelDelegate?

    func getFeedVideos() {

        let API_KEY = "AIzaSyCvsoQ-MffdpB8ZPw1SSZiS36BbRUMp2cs"
        let UPLOADS_PLAYLIST_ID = "TLGG_vHch6CEugIxNzAxMjAxOA"
        let CHANNEL_ID = "UC2D6eRvCeMtcF5OGHf1-trw"

        // fetching the videos dinamycally through API
        Alamofire.request("https://www.googleapis.com/youtube/v3/playlistItems", method: .get, parameters: ["part":"snippet,contentDetails", "playlistId":UPLOADS_PLAYLIST_ID, "key":API_KEY, "channelId":CHANNEL_ID], encoding: URLEncoding.default, headers: nil).responseJSON{ (response) in

            if let JSON = response.result.value {

                var arrayOfVideos = [Video]()

                if let dictionary = JSON as? [String:Any]{

                    for item in dictionary["items"] as! NSArray {
                     print(item)

                        //Create video objects off the JSON response
                        let videoObj = Video()
                        videoObj.videoId = Video.value(forKeyPath: "snippet.resourceID.videoId") as! String
                        videoObj.videoTitle = Video.value(forKeyPath: "snipper.tittle") as! String
                        videoObj.videoDiscription = Video.value(forKeyPath: "snippet.description") as! String
                        videoObj.videoThumbnailURL = Video.value(forKeyPath: "snippet.thumbnails.maxres.url") as! String

                        arrayOfVideos.append(videoObj)
                    }}
                    // When all the video objects have been constucted, assign the array to the VideoModel property
                    self.videoArray = arrayOfVideos

                    //Notify the delegate that the data is ready
                    if self.delegate != nil{
                        self.delegate!.dataReady()
                    }
                }

            }

        }

    func getVideos() -> [Video] {

        //Create a empty array of video objects
        var videos = [Video]()

        // Create a video object
        let video1 = Video()

        //Assign properties
        video1.videoId = "h8onY49kJPo"
        video1.videoTitle = "5-24-11 Canton Lake, Ok longdale tornado EF-3 Blaine County wedge"
        video1.videoDiscription = "***NOT FOR BROADCAST***"

        //Append in into  the videos array
        videos.append(video1)


        // Create a video object
        let video2 = Video()

        //Assign properties
        video2.videoId = "bAM9njN1Llo"
        video2.videoTitle = "8-25-2017 Fulton, TX Hurricane Harvey Extreme, insane incredible wind from eye wall"
        video2.videoDiscription = "***NOT FOR BROADCAST***"

        //Append in into  the videos array
        videos.append(video2)


        // Create a video object
        let video3 = Video()

        //Assign properties
        video3.videoId = "od79-MRWVmA"
        video3.videoTitle = "12-12-2017 Erie, Pa Lake Effect Snow Warning, Historic downtown, heavy snow piling up I-90"
        video3.videoDiscription = "***NOT FOR BROADCAST***"

        //Append in into  the videos array
        videos.append(video3)


        // Create a video object
        let video4 = Video()

        //Assign properties
        video4.videoId = "NxOj10ODtcI"
        video4.videoTitle = "6-15-2017 Great Bend, Ks Gustnado, dust storm, severe thunderstorm"
        video4.videoDiscription = "***NOT FOR BROADCAST***"

        //Append in into  the videos array
        videos.append(video4)


        // Create a video object
        let video5 = Video()

        //Assign properties
        video5.videoId = "vk5o-KSQf9I"
        video5.videoTitle = "3-1-17-Perryville-Mo-tornado-damage-I-55"
        video5.videoDiscription = "***NOT FOR BROADCAST***"

        //Append in into  the videos array
        videos.append(video5)

        //Return the array to the caller
        return videos
    }

}

我希望这有助于解释我的问题。仅仅学习了大约一年半的时间（我自己），对编码还是很陌生。

如果我的帖子有错误，我深表歉意，因为我是该小组的新手。

Answer 1

好吧，看来dictionary["items"] 不是一个数组。尝试使用“guard”语句而不是“if”。调试会更好