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我正在尝试在 UICollectionView 中使用我解码的 json 数据。我遇到的问题是单元格显示为空白。

当我打印解码结果时使用print(playing)或print(searchs)控制台显示正确的 json 数据。问题是当我把它变成var = nowPlaying = [Results]()什么都没有打印到控制台时，除了[].

如果我尝试使用var nowPlaying = [NowPlaying]()我会收到错误Value of type 'FilmsViewController.NowPlaying' has no member title，let title = film.title并且控制台只显示[]

我要解决的是如何在 UICollectionView 中显示数据。

代码：

import UIKit
import AFNetworking


class FilmsViewController: UIViewController, UICollectionViewDelegate, 
UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, 
UISearchBarDelegate, UITextFieldDelegate {

var nowPlaying = [Results]()

struct NowPlaying: Codable {
    let results: [Results]
}

struct Results: Codable {
    let title: String
    let poster_path: String?
    let id: Int
}

override func viewDidLoad() {
    super.viewDidLoad()

    self.filmsCollection.dataSource = self
    self.filmsCollection.delegate = self

    newFilms()

    print(nowPlaying)
    print(nowPlaying.count)


}

func collectionView(_ _collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

    if searchBar.text != "" {
        return searchTitle.count
    } else {
        return nowPlaying.count
    }
}


    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = filmsCollection.dequeueReusableCell(withReuseIdentifier: "filmCell", for: indexPath) as! FilmCell

        if searchBar.text == "" {
            let film = nowPlaying[indexPath.row]
            let title = film.title
            let poster = film.poster_path
            let baseUrl = "http://image.tmdb.org/t/p/w500"
            let imageUrl = URL(string: baseUrl + poster!)
            cell.titleLabel.text = title
            cell.posterImage.setImageWith(imageUrl!)
        }

        return cell


}

   ////////Parse Film API//////////////////


    func newFilms() {

        let apiKey = ""
        let url = URL(string: "https://api.themoviedb.org/3/movie/now_playing?api_key=\(apiKey)&language=en-US&page=1")
        let request = URLRequest(
            url: url! as URL,
            cachePolicy: URLRequest.CachePolicy.reloadIgnoringLocalCacheData,
            timeoutInterval: 10 )

        let session = URLSession (
            configuration: URLSessionConfiguration.default,
            delegate: nil,
            delegateQueue: OperationQueue.main
        )

        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
            if let data = data {
                do {
                    let playing = [try! JSONDecoder().decode(NowPlaying.self, from: data)]
                    print(playing)
                    self.filmsCollection.reloadData()

                }

            }

            self.filmsCollection.reloadData()

        })


        task.resume()

    }

    //////////End Parse Film API///////////////////

JSON API 数据：

{
results: [
{
vote_count: 549,
id: 335983,
video: false,
vote_average: 6.7,
title: "Venom",
popularity: 692.629,
poster_path: "/2uNW4WbgBXL25BAbXGLnLqX71Sw.jpg",
original_language: "en",
original_title: "Venom",
genre_ids: [
27,
878,
28,
53
],
backdrop_path: "/VuukZLgaCrho2Ar8Scl9HtV3yD.jpg",
adult: false,
overview: "When Eddie Brock acquires the powers of a symbiote, he will have to 
release his alter-ego “Venom” to save his life.",
release_date: "2018-10-03"
},
{
vote_count: 2515,
id: 363088,
video: false,
vote_average: 6.9,
title: "Ant-Man and the Wasp",
popularity: 247.334,
poster_path: "/rv1AWImgx386ULjcf62VYaW8zSt.jpg",
original_language: "en",
original_title: "Ant-Man and the Wasp",
genre_ids: [
28,
12,
35,
878,
10751,
10749
],
backdrop_path: "/6P3c80EOm7BodndGBUAJHHsHKrp.jpg",
adult: false,
overview: "Just when his time under house arrest is about to end, Scott Lang 
puts again his freedom at risk to help Hope van Dyne and Dr. Hank Pym dive into 
the quantum realm and try to accomplish, against time and any chance of 
success, a very dangerous rescue mission.",
release_date: "2018-07-04"
},
4

1 回答 1

1

您var nowPlaying = [Results]()以错误的方式设置数据。

要么你可以这样：

let playing = try! JSONDecoder().decode(NowPlaying.self, from: data)
print(playing)
self.nowPlaying = playing.results
self.filmsCollection.reloadData()

并且数据将填充到array.

或者你可以这样：

var nowPlaying : NowPlaying!

并在 api 方法中：

self.nowPlaying = try! JSONDecoder().decode(NowPlaying.self, from: data)
self.filmsCollection.reloadData()

然后在cellForItemAt：

let film = nowPlaying.results[indexPath.row]

我还没有编译代码，也不知道 json 数据。但是我根据我从问题中理解的内容给出了解决方案。

希望对你有效。

于 2018-10-09T08:07:50.260 回答