ios - tableView 没有快速显示来自 JSON 的数据

Question

我正在解析来自 HERE 的 JSON 数据.

为此我使用了这段代码。

DataManager.swift

import Foundation

let TopAppURL = "http://api.feedzilla.com/v1/categories.json"

class DataManager {

class func getTopAppsDataFromItunesWithSuccess(success: ((iTunesData: NSData!) -> Void)) {
    //1
    loadDataFromURL(NSURL(string: TopAppURL)!, completion:{(data, error) -> Void in
        //2
        if let urlData = data {
            //3
            success(iTunesData: urlData)
        }
    })
}

class func loadDataFromURL(url: NSURL, completion:(data: NSData?, error: NSError?) -> Void) {
var session = NSURLSession.sharedSession()

// Use NSURLSession to get data from an NSURL
let loadDataTask = session.dataTaskWithURL(url, completionHandler: { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
  if let responseError = error {
    completion(data: nil, error: responseError)
  } else if let httpResponse = response as? NSHTTPURLResponse {
    if httpResponse.statusCode != 200 {
      var statusError = NSError(domain:"com.raywenderlich", code:httpResponse.statusCode, userInfo:[NSLocalizedDescriptionKey : "HTTP status code has unexpected value."])
      completion(data: nil, error: statusError)
    } else {
      completion(data: data, error: nil)
    }
  }
})

loadDataTask.resume()
 }
}

和ViewController.swift

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

var i = 0
var detailid = [Int]()
var detailCat = [String]()
var tableData = ["1","2","3"]

@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()

DataManager.getTopAppsDataFromItunesWithSuccess { (iTunesData) -> Void in
    
    let json = JSON(data: iTunesData)
    
    if let array = json.arrayValue{

        for Dict in array{
            var id : Int = array[self.i]["category_id"].integerValue!
            var category : String = array[self.i]["english_category_name"].stringValue!
            self.detailid.append(id)
            self.detailCat.append(category)
            
            self.i++
            
        }
        println(self.detailid)
        println(self.detailCat)
    }
}


}

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


func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{
    
    var cell = tableView.dequeueReusableCellWithIdentifier("Cell") as UITableViewCell
    cell.textLabel.text = self.detailCat[indexPath.row]
    return cell
    
   }

}

在控制台中，我得到的数据如下:

[1314, 13, 21, 22, 5, 588, 6, 17, 25, 1168, 11, 14, 2, 28, 15, 33, 591, 20, 29, 36, 3, 10, 16, 18, 8, 34, 4, 27, 30, 31, 26, 23, 12, 7, 590, 9, 19]
[Sports, Art, Blogs, Business, Celebrities, Columnists, Entertainment, Events, Fun Stuff, General, Health, Hobbies, Industry, Internet, IT, Jobs, Law, Life Style, Music, Oddly Enough, Politics, Products, Programming, Religion And Spirituality, Science, Shopping, Society, Sports, Technology, Top Blogs, Top News, Travel, Universities, USA, Video, Video Games, World News]

但它没有将其打印到 tableView 中。

我错过了什么？请帮助我。

Answer 1

在 viewDidLoad 中的 for 循环 完成并获得数据后，您必须调用:

tableView.reloadData()