Swift 4 tableView API分页

本文介绍了Swift 4 tableView API分页的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我已经成功解析并解码了JSON数据，并显示在控制台中.我不知道如何在api上向下滚动时如何设置api的分页并显示所有数据.我使用的API是 rickandmortyapi/api/character/.谢谢您提前提供的所有帮助！

I have successfully parsed and decoded the JSON data and it displays in the console. I don't know how I would set up pagination with the api and display all of the data when I scroll down on the tableView. The API I'm using is rickandmortyapi/api/character/. Thank you for all your help in advance!

这是我的主ViewController中的代码

This is the code in my main ViewController

import UIKit struct PagedCharacters: Codable { struct Info: Codable { let count: Int let pages: Int let next: String let prev: String } struct Results: Codable { let name: String let status: String let species: String } let info: Info let results: [Results] } class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var uiTableView: UITableView! override func viewDidLoad() { super.viewDidLoad() getRickAndMortyData() self.uiTableView.dataSource = self self.uiTableView.delegate = self // Do any additional setup after loading the view. } func getRickAndMortyData() { //create instance of the url let url = "rickandmortyapi/api/character/" //construct the url, use guard to avoid nonoptional guard let urlObj = URL(string: url) else { return } //fetch data URLSession.shared.dataTask(with: urlObj) {(data, response, error) in //to avoid non optional in JSONDecoder guard let data = data else { return } do { //decode object let downloadedRickAndMorty = try JSONDecoder().decode(PagedCharacters.self, from: data) DispatchQueue.main.async { self.uiTableView.reloadData() } print(downloadedRickAndMorty) } catch { print(error) } }.resume() } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { // #warning Incomplete implementation, return the number of rows return 0 } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { guard let cell = tableView.dequeueReusableCell(withIdentifier: "rickandmortyCell") as? CharacterTableViewCell else { return UITableViewCell() } cell.nameLabel.text = "Name: " + PagedCharacters.Results[indexPath.row].name return cell } }

这是我的tableviewcell类

This is my tableviewcell class

import UIKit class CharacterTableViewCell: UITableViewCell { @IBOutlet weak var nameLabel: UILabel! override func awakeFromNib() { super.awakeFromNib() // Initialization code } override func setSelected(_ selected: Bool, animated: Bool) { super.setSelected(selected, animated: animated) // Configure the view for the selected state } }

这是打印解析的数据时我在控制台中获取的数据.我仍然无法从不同页面获取所有数据.

This is the data I'm getting in my console when the parsed data is printed. I'm still not getting all the data from the different pages.

PagedCharacters(info:API_Practice.PagedCharacters.Info(count:493， 页数:25，下一页:" rickandmortyapi/api/character/?page = 2 "， 上一个:")，结果:[API_Practice.PagedCharacters.Results(名称:"Rick 桑切斯"，状态:活着"，物种:人类")， API_Practice.PagedCharacters.Results(name:"Morty Smith"，状态: "Alive"，种类:"Human")，API_Practice.PagedCharacters.Results(名称: "Summer Smith"，状态:活着"，种类:人类")， API_Practice.PagedCharacters.Results(name:"Beth Smith"，状态: "Alive"，种类:"Human")，API_Practice.PagedCharacters.Results(名称: 杰里·史密斯"，状态:还活着"，物种:人类")， API_Practice.PagedCharacters.Results(name:"Abadango群集 公主"，状态:还活着"，物种:外星人")， API_Practice.PagedCharacters.Results(名称:"Abradolf Lincler"，状态: 未知"，种类:人类")， API_Practice.PagedCharacters.Results(name:"Adjudicator Rick"，状态: "Dead"，种类:"Human")，API_Practice.PagedCharacters.Results(名称: 代理总监"，状态:死亡"，种类:人类")， API_Practice.PagedCharacters.Results(name:"Alan Rails"，状态: "Dead"，种类:"Human")，API_Practice.PagedCharacters.Results(名称: 爱因斯坦(Albert Einstein)"，状态:死亡"，物种:人类")， API_Practice.PagedCharacters.Results(name:"Alexander"，状态: "Dead"，种类:"Human")，API_Practice.PagedCharacters.Results(名称: "Alien Googah"，状态:未知"，种类:"Alien")， API_Practice.PagedCharacters.Results(name:"Alien Morty"，状态: 未知"，种类:外星人")， API_Practice.PagedCharacters.Results(name:"Alien Rick"，状态: 未知"，种类:外星人")， API_Practice.PagedCharacters.Results(name:"Amish Cyborg"，状态: "Dead"，种类:"Alien")，API_Practice.PagedCharacters.Results(名称: 安妮"，状态:还活着"，物种:人类")， API_Practice.PagedCharacters.Results(名称:天线莫蒂"，状态: "Alive"，种类:"Human")，API_Practice.PagedCharacters.Results(名称: "Antenna Rick"，状态:未知"，种类:人类")， API_Practice.PagedCharacters.Results(name:"Ants in My Eyes Johnson"， 状态:未知"，种类:人类")))

PagedCharacters(info: API_Practice.PagedCharacters.Info(count: 493, pages: 25, next: "rickandmortyapi/api/character/?page=2", prev: ""), results: [API_Practice.PagedCharacters.Results(name: "Rick Sanchez", status: "Alive", species: "Human"), API_Practice.PagedCharacters.Results(name: "Morty Smith", status: "Alive", species: "Human"), API_Practice.PagedCharacters.Results(name: "Summer Smith", status: "Alive", species: "Human"), API_Practice.PagedCharacters.Results(name: "Beth Smith", status: "Alive", species: "Human"), API_Practice.PagedCharacters.Results(name: "Jerry Smith", status: "Alive", species: "Human"), API_Practice.PagedCharacters.Results(name: "Abadango Cluster Princess", status: "Alive", species: "Alien"), API_Practice.PagedCharacters.Results(name: "Abradolf Lincler", status: "unknown", species: "Human"), API_Practice.PagedCharacters.Results(name: "Adjudicator Rick", status: "Dead", species: "Human"), API_Practice.PagedCharacters.Results(name: "Agency Director", status: "Dead", species: "Human"), API_Practice.PagedCharacters.Results(name: "Alan Rails", status: "Dead", species: "Human"), API_Practice.PagedCharacters.Results(name: "Albert Einstein", status: "Dead", species: "Human"), API_Practice.PagedCharacters.Results(name: "Alexander", status: "Dead", species: "Human"), API_Practice.PagedCharacters.Results(name: "Alien Googah", status: "unknown", species: "Alien"), API_Practice.PagedCharacters.Results(name: "Alien Morty", status: "unknown", species: "Alien"), API_Practice.PagedCharacters.Results(name: "Alien Rick", status: "unknown", species: "Alien"), API_Practice.PagedCharacters.Results(name: "Amish Cyborg", status: "Dead", species: "Alien"), API_Practice.PagedCharacters.Results(name: "Annie", status: "Alive", species: "Human"), API_Practice.PagedCharacters.Results(name: "Antenna Morty", status: "Alive", species: "Human"), API_Practice.PagedCharacters.Results(name: "Antenna Rick", status: "unknown", species: "Human"), API_Practice.PagedCharacters.Results(name: "Ants in my Eyes Johnson", status: "unknown", species: "Human")])

如果您还有其他需要，请告诉我.谢谢！

If you need anything else please let me know. Thank you!

推荐答案

您的逻辑中有很多缺陷，因此我以最小的更改将其重写.现在它将满足您的目的.

There were many flaws in your logic, so I have rewritten it with minimal changes. Now it will serve your purpose.

import UIKit struct PagedCharacters: Codable { let info: Info let results: [Results] } struct Info: Codable { let count: Int let pages: Int let next: String let prev: String } struct Results: Codable { let name: String let status: String let species: String }

这是视图控制器类的代码:

And here is the code for view controller class:

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var uiTableView: UITableView! var aryDownloadedData:[Results]? var nextPageUrl:String! override func viewDidLoad() { super.viewDidLoad() getIntitalRickAndMortyData() self.uiTableView.dataSource = self self.uiTableView.delegate = self // Do any additional setup after loading the view. } func getIntitalRickAndMortyData(){ aryDownloadedData = [] //here first page is next page nextPageUrl = "rickandmortyapi/api/character/" getRickAndMortyData() } func getRickAndMortyData() { //construct the url, use guard to avoid nonoptional guard let urlObj = URL(string: nextPageUrl) else { return } //fetch data URLSession.shared.dataTask(with: urlObj) {[weak self](data, response, error) in //to avoid non optional in JSONDecoder guard let data = data else { return } do { //decode object let downloadedRickAndMorty = try JSONDecoder().decode(PagedCharacters.self, from: data) self?.aryDownloadedData?.append(contentsOf: downloadedRickAndMorty.results) self?.nextPageUrl = downloadedRickAndMorty.info.next DispatchQueue.main.async { self?.uiTableView.reloadData() } print(self?.aryDownloadedData as Any) } catch { print(error) } }.resume() } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return self.aryDownloadedData?.count ?? 0 } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { if let count = aryDownloadedData?.count, count>1{ let lastElement = count - 1 if indexPath.row == lastElement { //call get api for next page getRickAndMortyData() } } guard let cell = tableView.dequeueReusableCell(withIdentifier: "rickandmortyCell") as? CharacterTableViewCell else { return UITableViewCell() } cell.nameLabel.text = "Name: " + (self.aryDownloadedData?[indexPath.row].name ?? "default") return cell } }