【发布时间】：2014-07-29 13:18:32
【问题描述】：
我正在尝试同时学习Swift 和iOS dev 的基础知识，所以请耐心等待。我有一个TableViewController，它首先解析一个本地JSON 文件并将其非常简单的数据呈现到TableViewCell 和SectionHeaderViews 中。在同一个TableViewController 中，我正在调用JSON 端点，该端点正在返回数据，然后我将其设置为变量，以便我可以访问我真正想要获取的内容（API 结构小于可取的）。所以，我最终将正确的数据设置为self.tableData，然后调用self.tableView.reloadData()，但没有任何反应。什么给了？
import UIKit
class BusinessTableViewController: UITableViewController {
var data: NSMutableData = NSMutableData()
var tableData: NSArray = NSArray()
@lazy var Business: NSArray = {
let pathTCT = NSBundle.mainBundle().pathForResource("TCT", ofType: "json")
let data = NSData.dataWithContentsOfFile(pathTCT, options: nil, error: nil)
return NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as NSArray
}()
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.titleView = UIImageView(image: UIImage(named: "growler"))
tableView.registerClass(BeerTableViewCell.self, forCellReuseIdentifier: "cell")
tableView.separatorStyle = .None
fetchKimono()
}
override func numberOfSectionsInTableView(tableView: UITableView!) -> Int {
// return Business.count
return 1
}
override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
let biz = Business[section] as NSDictionary
let results = biz["results"] as NSDictionary
let beers = results["collection1"] as NSArray
return beers.count
}
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell? {
let cell = tableView!.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath!) as BeerTableViewCell
if let path = indexPath {
let biz = Business[path.section] as NSDictionary
let results = biz["results"] as NSDictionary
let beers = results["collection1"] as NSArray
let beer = beers[path.row] as NSDictionary
cell.titleLabel.text = beer["BeerName"] as String
}
return cell
}
override func tableView(tableView: UITableView!, titleForHeaderInSection section: Int) -> String! {
let biz = Business[section] as NSDictionary
return biz["name"] as String
}
override func tableView(tableView: UITableView!, viewForHeaderInSection section: Int) -> UIView! {
let biz = Business[section] as NSDictionary
let view = LocationHeaderView()
view.titleLabel.text = (biz["name"] as String).uppercaseString
return view
}
override func tableView(tableView: UITableView!, heightForHeaderInSection section: Int) -> CGFloat {
return 45
}
func fetchKimono() {
var urlPath = "names have been changed to protect the innocent"
var url: NSURL = NSURL(string: urlPath)
var request: NSURLRequest = NSURLRequest(URL: url)
var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)
connection.start()
}
func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
// Recieved a new request, clear out the data object
self.data = NSMutableData()
}
func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
// Append the recieved chunk of data to our data object
self.data.appendData(data)
}
func connectionDidFinishLoading(connection: NSURLConnection!) {
// Request complete, self.data should now hold the resulting info
// Convert the retrieved data in to an object through JSON deserialization
var err: NSError
var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
var results: NSDictionary = jsonResult["results"] as NSDictionary
var collection: NSArray = results["collection1"] as NSArray
if jsonResult.count>0 && collection.count>0 {
var results: NSArray = collection as NSArray
self.tableData = results
self.tableView.reloadData()
}
}
}
【问题讨论】：
-
所以，我的第一个错误是 Business 实际上需要是一个 NSDictionary，以匹配正在获取的 JSON。这摆脱了所有的商业变量。第二个错误是我不需要 self.tableData，我需要 Business = jsonResults——但现在我得到一个内存错误。我需要解除分配或取消初始化吗？
-
请发布您的最新代码
-
@Dash 在下面添加了我的答案。
标签： ios objective-c json uitableview swift