我想使用UISearchBar创建JSON数组值的搜索。
主要任务是按要在searchBar中写入的城市对单元格进行排序
但是我的代码不起作用 我试图创建一个新的数组，但是也没有用 我部分重复了YouTube频道Vasil Nunev视频教程中用于解析json的代码
@IBOutlet weak var tableview: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
var articles: [Article]? = []
func fetchArticles(){
let urlRequest = URLRequest(url: URL(string: "http://jjj.json")!)
let task = URLSession.shared.dataTask(with: urlRequest) { (data,response,error) in
if error != nil {
print(error)
return
}
self.articles = [Article]()
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String : AnyObject]
if let articlesFromJson = json["articles"] as? [[String : AnyObject]] {
for articleFromJson in articlesFromJson {
let article = Article()
if let title = articleFromJson["user_name"] as? String,
let desc = articleFromJson["desk"] as? String,
let url = articleFromJson["number"] as? String,
let city = articleFromJson["city"] as? String,
let city2 = articleFromJson["city2"] as? String,
let author = articleFromJson["date"] as? String,
let urlToImage = articleFromJson["img"] as? String {
article.author = author
article.desc = desc
article.city = city
article.city2 = city2
article.headline = title
article.url = url
article.imageUrl = urlToImage
}
self.articles?.append(article)
}
}
DispatchQueue.main.async {
self.tableview.reloadData()
}
} catch let error {
print(error)
}
}
task.resume()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "articleCell", for: indexPath) as! ArticleCell
cell.title.text = self.articles?[indexPath.item].headline
cell.desc.text = self.articles?[indexPath.item].desc
cell.city.text = self.articles?[indexPath.item].city
cell.city2.text = self.articles?[indexPath.item].city2
cell.url.text = self.articles?[indexPath.item].url
cell.author.text = self.articles?[indexPath.item].author
cell.imgView.downloadImage(from: (self.articles?[indexPath.item].imageUrl!)!)
return cell
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.articles?.count ?? 0
}
func searchBar(_ searchBar:UISearchBar,textDidChange indexPath: IndexPath, searchText: String) {
articles = articles?[indexPath.item].filter({article -> Bool in
guard let text = searchBar.text else { return false }
return article.city.contains(text) })
}