Question

我一直在尝试从交易网站获取数据，使用api：＆＃34; https://bittrex.com/api/v1.1/public/getmarketsummaries＆＃34;并需要从这里取出一些值。我需要一个关于理解JSONarray和Dictionary的指导。如果代码也可以改进，请。

import UIKit

class DemoJsonTableViewController: UITableViewController {

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

override func viewDidLoad() {
    super.viewDidLoad()

    let url:String = "https://bittrex.com/api/v1.1/public/getmarketsummaries"

    let urlRequest = URL(string: url)

    URLSession.shared.dataTask(with: urlRequest!) { (data, response, error) in



        if(error != nil){
            print(error.debugDescription)
        }
        else{
            do{
                self.listData = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! [String:AnyObject]
                {
                    self.listData = dictionary["result"] as! [[String:AnyObject]]
                }

                    self.tableView.reloadData()

            }catch let error as NSError{
                print(error)
            }
        }
    }.resume()
    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()
}

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

// MARK: - Table view data source

override func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

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


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

   let item = self.listData[indexPath.row]
    cell.textLabel?.text = item["MarketName"] as? String
    print(self.listData.count)

    return cell
}


/*
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
    // Return false if you do not want the specified item to be editable.
    return true
}
*/

/*
// Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
        // Delete the row from the data source
        tableView.deleteRows(at: [indexPath], with: .fade)
    } else if editingStyle == .insert {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }    
}
*/

/*
// Override to support rearranging the table view.
override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {

}
*/

/*
// Override to support conditional rearranging of the table view.
override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
    // Return false if you do not want the item to be re-orderable.
    return true
}
*/

/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/

}

这是我要导入的链接＆＃34; MarketName＆＃34;和＆＃34;最后＆＃34;进入表格视图，但无法理解JSONarray等。

请，需要帮助。我是一个非常新的编码所以如果你能纠正代码，它会很友好。感谢

Answer 1

将其添加到UITableViewController：

的顶部

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

并将您的URLSession代码替换为：

URLSession.shared.dataTask(with: urlRequest!) { (data, response, error) in
  if(error != nil){
    print(error.debugDescription)
  }
  else{
    do{
      let response = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! [String:AnyObject]
      self.listData = response["result"] as! [[String:AnyObject]]
      DispatchQueue.main.async {
          self.tableView.reloadData()
      }
    }catch let error as NSError{
      print(error)
    }
  }
  }.resume()

我希望它可以帮到你。

使用JSON的表视图的API

1 个答案: