使用SwiftyJSON和Alamofire的TableView上的JSON数据

Question

I want to show data on a Table View. The problem is, I can't get it to show up on it. My code is shown below and I hope somebody can help me out.

import Foundation

struct HeroStats {

  let localized_name: String
  let primary_attr: String
  let attack_type: String
  let legs: String
  let img: String
}

Here is my viewController code:

import UIKit
import Alamofire
import SwiftyJSON

class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {

  @IBOutlet var tableView: UITableView!
  var heros = [HeroStats]()

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

    downloadJson()
    self.tableView.reloadData()


    tableView.delegate = self
    tableView.dataSource = self

  }

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

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: 
IndexPath) -> UITableViewCell {
    let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
    cell.textLabel?.text = 
    heros[indexPath.row].localized_name.capitalized
    return cell
  }

  //MARK: Parsing JSON data
  func downloadJson(){
Alamofire.request("https://api.opendota.com/api/heroStats").responseJSON { response in

        if let value = response.result.value {

           let json = JSON(value)

        //Printing strings from a JSON Dictionary
        print(json[0]["localized_name"].stringValue)
        print(json[0]["primary_attr"].stringValue)
        print(json[0]["attack_type"].stringValue)
        print(json[0]["legs"].stringValue)
        print(json[0]["img"].stringValue)
       }
    } // End Alamofire call
  }
}

Answer 1

The request is async . When it gives you a result, you need to parse it and assign it to your array of HeroStat . That needs to be done in your request completion handler. You are currently doing nothing after you get your response. Also, your call to reloadData is done before you actually get a response, so that won't do.

What you could do is: Once you get your response, populate the heros array and call tableView.reloadData() to make it fetch the new populated HeroStat values.