将数据从 JSON 传递到 table 查看 Swift 中的单元格 3

Question

我正在尝试将数据从 JSON 响应传递到 table 视图单元格。我在捕获在 URLSession.shared.dataTask.

中提取的响应值时遇到问题

    func callYouTubeAPIToGetAllVideos() {

    let url = URL(string: "https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=XYZ&maxResults=50&order=date&key=ABC")

    let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
        if error != nil {
            print(error!)
        } else {
            if let usableData = data {
                let json = try? JSONSerialization.jsonObject(with: usableData, options: [])
                if let dictionary = json as? [String: Any?] {
                    if let array = dictionary["items"] as? [Any] {
                        for object in array {
                            if let objectAsDictionary = object as? [String: Any?] {
                                if let objectWithKindAndVideoId = objectAsDictionary["id"] as? [String: String] {
                                    if let videoId = objectWithKindAndVideoId["videoId"] {
                                        //pass data to table cell
                                    }
                                }
                                if let snippet = objectAsDictionary["snippet"] as? [String: Any] {
                                    if let description = snippet["description"] {
                                        //pass data to table cell
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    task.resume()
}

我尝试将值附加到实例变量，但没有成功。

抱歉代码乱七八糟，这是我第一次在 Swift 中使用 JSON。

Answer 1

首先从不将收到的JSON字典声明为[String:Any?]。收到的字典值不能是 nil.

声明自定义结构Video。

struct Video {      
    let videoId : String
    let description : String
}

声明一个数据源数组。
```
var videos = [Video]()
```

将JSON解析到数组中并在主线程上重新加载table视图。

func callYouTubeAPIToGetAllVideos() {

    let url = URL(string: "https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=XYZ&maxResults=50&order=date&key=ABC")

    let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
       if error != nil {
            print(error!)
        } else {
            do {
                if let dictionary = try JSONSerialization.jsonObject(with: data!) as? [String: Any],
                    let array = dictionary["items"] as? [[String: Any]] {
                    for object in array {
                        if let objectWithKindAndVideoId = object["id"] as? [String: String],
                           let snippet = object["snippet"] as? [String: Any] {
                               let videoId = objectWithKindAndVideoId["videoId"] ?? ""
                               let description = snippet["description"] as? String ?? ""
                               let video = Video(videoId: videoId, description: description)
                               self.videos.append(video)
                         }

                    }
                    DispatchQueue.main.async {
                        self.tableView.reloadData()
                    }
                }
            } catch {
                print(error)
            }
        }
    }
    task.resume()
}

在 cellForRow 中将值分配给文本属性

let video = videos[indexPath.row]
cell.textLabel!.text = video.videoId
cell.detailTextLabel?.text = video.description

将数据从 JSON 传递到 table 查看 Swift 中的单元格 3

Passing data from JSON to table view cell in Swift 3

ios

json

swift

uitableview

tableviewcell