Swift 3 和 Alamofire - 来自 JSON 的图像和数据

Question

我有一个项目正在尝试使用 alamofire 从 web url 引入数据。我正在尝试引入图像和文本，但不断构建失败。我正在尝试将数据（图像和文本）添加到标签 = 1 和 2。我的代码低于任何帮助将不胜感激。我对斯威夫特相当陌生。谢谢

SWIFT

import UIKit
import Alamofire

struct postinput {
    let mainImage : UIImage!
    let name : String!

}


class TableViewController: UITableViewController {

    var postsinput = [postinput]()

    var mainURL = "https://www.testJSON.com"

    typealias JSONstandard = [String : AnyObject]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        callAlamo(url: mainURL)
    }

    func callAlamo(url : String){
        Alamofire.request(url).responseJSON(completionHandler: {
            response in

            self.parseData(JSONData: response.data!)


        })

    }

    func parseData(JSONData : Data) {
        do {
            var readableJSON = try JSONSerialization.jsonObject(with: JSONData, options: .mutableContainers) as! JSONstandard

            if let posts = readableJSON["posts"] as? [JSONstandard] {
                for post in posts { 
                    let title = post["title"] as! String

                    if let images = post["image"] as? JSONstandard {
                        let mainImageURL = URL(string: imageData["url"] as! String)
                        let mainImageData = NSData(contentsOf: mainImageURL!)

                        let mainImage = UIImage(data: mainImageData as! Data)

                    }

                    postsinput.append(postinput.init(mainImage: mainImage, name: name))


                }

                self.tableView.reloadData() 
            }

        }


        catch {
            print(error)
        }


    }




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

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell")

        // cell?.textLabel?.text = titles[indexPath.row]

        let mainImageView = cell?.viewWithTag(2) as! UIImageView

        mainImageView.image = postsinput[indexPath.row].mainImage

        let mainLabel = cell?.viewWithTag(1) as! UILabel

        mainLabel.text = postsinput[indexPath.row].name


        return cell!
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

JSON

 { posts: [ { id: “000000”, url: "/content/interview2”, date: "2016-11-03 09:01:41", modified: "2016-11-03 09:03:47", title: "An interview", image: "https://www.example.com/sites/default/files/oregood.jpeg", summary: { value: "<p>Latin text here</p> ", format: "filtered_html" } ]}

Answer 1

以下是您的构建错误的原因如下：

1. 您在获取mainImage 的上下文之外添加了这一行postsinput.append(postinput.init(mainImage: mainImage, name: name)) 。基于json，我相信你应该这样重写它。

   if let imageUrl = post["image"] as? JSONstandard {
      let mainImageURL = URL(string: imageUrl)
      let mainImageData = NSData(contentsOf: mainImageURL!)
   
      let mainImage = UIImage(data: mainImageData as! Data)
      postsinput.append(postinput.init(mainImage: mainImage, name: title))
   }
   

2. 即使您这样做，变量imageData 和name 也未定义。你应该调查一下。

3. 只是一个建议，不要强制打开可选选项。尽可能使用可选绑定。