我需要将JSON数据排序/分组为tableview的各个部分。
目前，无法轻松更改JSON数据，因此需要在Swift中对其进行重新排序。
基本上，我希望它计算有多少个不同的日期(这只是一个字符串值)，并根据它对数据进行排序。然后，这些部分应为不同的日期，各行中应包含相关的文章。
该表视图应如下所示:
**January 1, 2016**
- Article A
- Title
- Author
- ETC...
- Article C
- Title
- Author
- ETC...
**February 2, 2016**
- Article B
- Title
- Author
- ETC...
现在，JSON类似于:
[
{
“x_author”: "",
"excerpt" :
"rendered": “”
},
"x_featured_media" : "",
"title": {
"rendered": “A”
},
"x_date": “January 1, 2016",
},
{
“x_author”: "",
"excerpt" :
"rendered": “”
},
"x_featured_media" : "",
"title": {
"rendered": “B”
},
"x_date": “February 1, 2016",
},
{
“x_author”: "",
"excerpt" :
"rendered": “”
},
"x_featured_media" : "",
"title": {
"rendered": “C”
},
"x_date": “January 1, 2016",
},
]
ViewController看起来像这样:
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var tableview: UITableView!
var articles: [Article]? = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
fetchArticles()
}
func fetchArticles() {
let urlRequest = URLRequest(url: URL(string: "SITE")!)
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? AnyObject
if let articlesFromJson = json as? [[String : AnyObject ]] {
for articleFromJson in articlesFromJson {
let article = Article()
if let title = articleFromJson["title"]?["rendered"] as? String,
let author = articleFromJson["x_author"] as? String,
let desc = articleFromJson["excerpt"]?["rendered"] as? String,
let url = articleFromJson["link"] as? String,
let urlToImage = articleFromJson["x_featured_media"] as? String,
let date = articleFromJson["x_date"] as? String {
article.author = author
article.desc = desc
article.headline = title
article.url = url
article.imageUrl = urlToImage
article.date = date
}
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.author.text = self.articles?[indexPath.item].author
cell.date.text = self.articles?[indexPath.item].date
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 tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let webVC = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "web") as! WebviewViewController
webVC.url = self.articles?[indexPath.item].url
self.present(webVC, animated: true, completion: nil)
}
}
Article类看起来像:
import UIKit
class Article: NSObject {
var headline: String?
var desc: String?
var author: String?
var url: String?
var content: String?
var imageUrl: String?
var date: String?
}
我该怎么做？
编辑1:
遵循dmorrow的建议，视图控制器现在看起来像这样:
struct Issue {
let dateName: String?
var articles: [Article]?
}
struct Article {
var headline: String?
var desc: String?
var author: String?
var url: String?
var imageUrl: String?
var date: String?
}
var groupedArticles = [Issue]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
fetchArticles()
}
func fetchArticles() {
let urlRequest = URLRequest(url: URL(string: "SITE")!)
let task = URLSession.shared.dataTask(with: urlRequest) { (data, response, error) in
if error != nil {
print(error)
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? AnyObject
if let articlesFromJson = json as? [[String : AnyObject ]] {
for articleFromJson in articlesFromJson {
self.groupedArticles.append(Issue(dateName: (articleFromJson["x_date"] as! String), articles: [Article(headline: (articleFromJson["title"] as! String), desc: (articleFromJson["excerpt"] as! String), author: (articleFromJson["x_author"] as! String), url: (articleFromJson["x_featured_media"] as! String), imageUrl: (articleFromJson["x_featured_media"] as! String), date: (articleFromJson["x_date"] as! String))]))
}
}
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.groupedArticles[indexPath.section].articles?[indexPath.row].headline
cell.desc.text = self.groupedArticles[indexPath.section].articles?[indexPath.row].desc
cell.author.text = self.groupedArticles[indexPath.section].articles?[indexPath.row].author
cell.date.text = self.groupedArticles[indexPath.section].articles?[indexPath.row].date
cell.imgView.downloadImage(from: (self.groupedArticles[indexPath.section].articles?[indexPath.row].imageUrl!)!)
return cell
}
func numberOfSections(in tableView: UITableView) -> Int {
return groupedArticles.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return groupedArticles[section].articles?.count ?? 0
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let webVC = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "web") as! WebviewViewController
webVC.url = self.groupedArticles[indexPath.section].articles?[indexPath.row].url
self.present(webVC, animated: true, completion: nil)
}
但是，在以下位置出现错误:
self.groupedArticles.append(Issue(dateName:(articleFromJson [“x_date”]
如!字符串)，文章:[Article(标题:(articleFromJson [“title”]
如!字符串)，desc :(作者:articleFromJson [“excerpt”]!)，作者:
(articleFromJson [“x_author”] as!String)，网址:
(articleFromJson [“x_featured_media”] as!字符串)，imageUrl:
(articleFromJson [“x_featured_media”] as!字符串)，日期:
(articleFromJson [“x_date”] as!String)))))
“无法将类型'__NSDictionaryM'(0x106a35260)的值强制转换为'NSString'(0x1031d9c40)。”
这是正确的曲目吗？我该如何解决？
编辑2
更新了fetchArticles函数:
func fetchArticles() {
let urlRequest = URLRequest(url: URL(string: "X")!)
let task = URLSession.shared.dataTask(with: urlRequest) { (data, response, error) in
if error != nil {
print(error)
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? AnyObject
if let articlesFromJson = json as? [[String : AnyObject]] {
for articleFromJson in articlesFromJson {
// Get All Articles
var articleEntries = [Issue]()
articleEntries.append(Issue(dateName: (articleFromJson["x_date"] as! String), articles: [Article(headline: (articleFromJson["title"]?["rendered"] as! String), desc: (articleFromJson["excerpt"]?["rendered"] as! String), author: (articleFromJson["x_author"] as! String), url: (articleFromJson["x_featured_media"] as! String), imageUrl: (articleFromJson["x_featured_media"] as! String), date: (articleFromJson["x_date"] as! String))]))
// SORT Articles by KEY of X_Date(String)
var groupedArts = [String: [Issue]]()
var groupedKeys = Array<String>()
for article in articleEntries {
let index = (article.dateName?.startIndex)!..<(article.dateName?.endIndex)!
let keys = String(describing: article.dateName?[index])
if groupedArts[keys] != nil {
groupedArts[keys]?.append(article)
print("this array exists")
} else {
groupedArts[keys] = [article]
groupedKeys.append(keys)
print("this array does not exist")
}
}
print(groupedArts)
print(groupedKeys)
}
}
DispatchQueue.main.async {
self.tableview.reloadData()
}
} catch let error {
print(error)
}
}
task.resume()
}
根据我的理解，我应该解析这些条目，然后使用类似于示例代码的东西重新排序它们，但是它们会分别产生结果:
[“可选(\” 2016年2月14日\“)”:
[Journal.ViewController.Issue(dateName:Optional(“2016年2月14日”)，
文章:可选([Journal.ViewController.Article(标题:
可选(“案例文件:严重缺氧时休克”)，说明:
可选(“ABC”)，作者:
Optional(“AUTHOR”)，URL:Optional(“X”)，imageUrl:Optional(“X”)，日期:
Optional(“2016年2月14日”))]))]]]] [[Optional(\“Febuary 14，
2016 \“)”]
每篇文章等等。我试图解析IF语句中的文章，但这会使所有内容崩溃。我能做什么？
最佳答案
通常，您需要为数据源创建一个Section数组。
struct Section {
let date:Date
var articles:[Article]
}
var groupedArticles = [Section]()
在将JSON解析为
Article时，应将它们存储在此数组中。 Article应该应该是一个结构，并且您应该研究https://github.com/Hearst-DD/ObjectMapper或https://github.com/SwiftyJSON/SwiftyJSON然后您可以使用这些方法
func numberOfSections(in tableView: UITableView) -> Int {
return groupedArticles.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return groupedArticles[section].articles.count ?? 0
}
看到类似的答案-https://stackoverflow.com/a/42277283/1189470