JSON解析迅速，始终捕获语句执行

Question

我有 UITableViewController，我正在尝试从 url 解析数据， 始终捕获正在执行的语句，该语句在控制台中打印“某事”。 在 Storyboard 中，我将重用标识符添加到表格视图单元格中。

''' 类 TableViewController: UITableViewController {

final let url = URL(string: "http://jsonplaceholder.typicode.com/posts")
private var posts = [Post]()

override func viewDidLoad() {
    super.viewDidLoad()
    downloadJson()
}

func downloadJson() {
    guard let downloadURL = url else { return }
    URLSession.shared.dataTask(with: downloadURL) { (data, response, error) in
        guard let data = data, error == nil, response != nil else {
            return
        }
        
        do {
            let decoder = JSONDecoder()
            let tempPosts = try decoder.decode(Posts.self, from: data)
            print(tempPosts)
            self.posts = tempPosts.posts

            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        } catch {
            print("something")
        }
    }.resume()
}

// MARK: - Table view data source

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return posts.count
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    cell.textLabel?.text = posts[indexPath.row].title
    return cell
}

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)
}

} '''

'''

class Posts: Codable {
    let posts: [Post]
    
    init(posts: [Post]) {
        self.posts = posts
    }
}

class Post: Codable {
    let userId: Int
    let id: Int
    let title: String
    let body: String
    
    init(userId: Int, id: Int, title: String, body: String) {
        self.userId = userId
        self.id = id
        self.title = title
        self.body = body
    }

} '''

Answer 1

如果Post 模型是，

struct Post: Codable {
    let userId, id: Int
    let title, body: String
}

在解析data时使用[Posts].self而不是Posts.self。

let tempPosts = try decoder.decode([Post].self, from: data)