问题描述
我正在尝试过滤API中的数据。已成功加载到具有表格视图单元格的视图控制器中。这是一个电影应用程序。我正在尝试根据用户在文本框中键入的内容来筛选数据。我在代码筛选器中提到了电影的标题，但代码只能筛选电影的标题和概述，但图像字段保持未筛选状态，如图像、概述等。这是结构模型。
import Foundation
struct Movie: Decodable {
let originalTitle: String
let overview: String
let posterPath: String
enum CodingKeys: String, CodingKey {
case originalTitle = "original_title"
case overview
case posterPath = "poster_path"
}
}
以下是协议类代码。
import Foundation
class MoviePresenter: MoviePresenterProtocol {
private let view: MovieViewProtocol
private let networkManager: NetworkManager
var movies = [Movie]()
private var cache = [Int: Data]()
var rows: Int {
return movies.count
}
init(view: MovieViewProtocol, networkManager: NetworkManager = NetworkManager()) {
self.view = view
self.networkManager = networkManager
}
func getMovies() {
let url = "https://api.themoviedb.org/3/movie/popular?language=en-US&page=3&api_key=6622998c4ceac172a976a1136b204df4"
networkManager.getMovies(from: url) { [weak self] result in
switch result {
case .success(let response):
self?.movies = response.results
self?.downloadImages()
DispatchQueue.main.async {
self?.view.resfreshTableView()
}
case .failure(let error):
DispatchQueue.main.async {
self?.view.displayError(error.localizedDescription)
}
}
}
}
func getTitle(by row: Int) -> String? {
return movies[row].originalTitle
}
func getOverview(by row: Int) -> String? {
return movies[row].overview
}
func getImageData(by row: Int) -> Data? {
return cache[row]
}
private func downloadImages() {
let baseImageURL = "https://image.tmdb.org/t/p/w500"
let posterArray = movies.map { "(baseImageURL)($0.posterPath)" }
let group = DispatchGroup()
group.enter()
for (index, url) in posterArray.enumerated() {
networkManager.getImageData(from: url) { [weak self] data in
if let data = data {
self?.cache[index] = data
}
}
}
group.leave()
group.notify(queue: .main) { [weak self] in
self?.view.resfreshTableView()
}
}
}
以下是控制器代码。
import UIKit
class MovieViewController: UIViewController, UISearchBarDelegate {
@IBOutlet weak var userName: UILabel!
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
private var presenter: MoviePresenter!
var finalname = ""
override func viewDidLoad() {
super.viewDidLoad()
userName.text = "Hello: " + finalname
setUpUI()
presenter = MoviePresenter(view: self)
searchBarText()
}
private func setUpUI() {
tableView.dataSource = self
tableView.delegate = self
}
private func searchBarText() {
searchBar.delegate = self
}
@IBAction func selectSegment(_ sender: UISegmentedControl) {
if sender.selectedSegmentIndex == 1{
setUpUI()
presenter = MoviePresenter(view: self)
presenter.getMovies()
}
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if searchText == ""{
presenter.getMovies()
}
else {
presenter.movies = presenter.movies.filter({ movies in
return movies.originalTitle.lowercased().contains(searchText.lowercased())
})
}
tableView.reloadData()
}
}
extension MovieViewController: MovieViewProtocol {
func resfreshTableView() {
tableView.reloadData()
}
func displayError(_ message: String) {
let alert = UIAlertController(title: "Error", message: message, preferredStyle: .alert)
let doneButton = UIAlertAction(title: "Done", style: .default, handler: nil)
alert.addAction(doneButton)
present(alert, animated: true, completion: nil)
}
}
extension MovieViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
presenter.rows
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: MovieViewCell.identifier, for: indexPath) as! MovieViewCell
let row = indexPath.row
let title = presenter.getTitle(by: row)
let overview = presenter.getOverview(by: row)
let data = presenter.getImageData(by: row)
cell.configureCell(title: title, overview: overview, data: data)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let dc = storyboard?.instantiateViewController(withIdentifier: "MovieDeatilsViewController") as! MovieDeatilsViewController
let row = indexPath.row
dc.titlemovie = presenter.getTitle(by: row) ?? ""
dc.overview = presenter.getOverview(by: row) ?? ""
dc.imagemovie = UIImage(data: presenter.getImageData(by: row)!)
self.navigationController?.pushViewController(dc, animated: true)
}
}
extension MovieViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableView.automaticDimension
}
}
这是结果的屏幕截图。
推荐答案
在Tableview中缓存图片有一点棘手，当单元格发生变化或自身重用时可能会出现问题 这是因为当文本不同时，您会看到相同的图像。
有两个著名的包，你可以使用它来解决你的问题，而且它很容易使用，有很多选项。
1-Kingfisher
2-SDWebImage