ios - 如何在 Swift 中的 tableview 自定义单元格上显示 JSON 图像？

Question

我是编码新手，正在学习如何将 JSON 图像解析为 TableView 能够显示标签，但无法显示图像文件。如何显示呢？我使用了下面给出的代码，请检查它。

import UIKit

class ViewController: UIViewController, UITableViewDelegate,UITableViewDataSource {

    var dataArray = [[String:AnyObject]]()

    @IBOutlet weak var myTable: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()
        let url = URL(string: "https://jsonplaceholder.typicode.com/photos")! //change the url
        let session = URLSession.shared
        var request = URLRequest(url: url)
        request.httpMethod = "GET" //set http method as POST
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
            guard error == nil else {
                return
            }

            guard let data = data else {
                return
            }

            do {
                if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [[String:Any]] {

                    self.dataArray = json as [[String : AnyObject]]
                    DispatchQueue.main.async {
                        self.myTable.reloadData()
                    }
                    print(json)
                }
            } catch let error {
                print(error.localizedDescription)
            }
        })
        task.resume()
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataArray.count
    }

    func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
        return 250
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 250
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "id") as! ModTableViewCell
        cell.labout.text = String(describing: dataArray[indexPath.row]["id"]!)
        cell.imagethum.image = UIImage(named :dataArray[indexPath.row]["thumbnailUrl"]! as! String)
        return cell
    }
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "story") as? FinalViewController
        var selectedindex = indexPath.row
        vc?.jarray = dataArray
        vc?.selectedindex1 = selectedindex
        self.navigationController?.pushViewController(vc!, animated: true)
    }
}

Answer 1

您需要首先下载您的图像。基本的解决办法是:

    if let url = URL(string: "YOUR_URL") {
         if let data = try? Data(contentsOf: url) {
              cell.imagethum.image = UIImage(data: data)
         }
    }

要了解更高级的解决方案，请查看 SDWebImage 框架(例如) - 它适合初学者。