ios - 在 swift 中使用 JSON 数组

Question

我在访问存储在 JSON API 中的信息时遇到问题，只要它位于 [] 括号内而不是 {} 括号内。我正在尝试搜索数组并找到匹配 "job": "director" 的 {} 集。问题是，如果我不使用 CollectionView 等 IndexPath View ，我将无法访问位于 [] 括号内的信息。

JSON:

"crew": [
{
  "credit_id": "57ea3a02c3a3687edc00080a",
  "department": "Directing",
  "gender": 2,
  "id": 51329,
  "job": "Director",
  "name": "Bradley Cooper",
  "profile_path": "/z5LUl9bljJnah3S5rtN7rScrmI8.jpg"
},
{
  "credit_id": "57ea3a14c3a3687ff9007bd7",
  "department": "Writing",
  "gender": 2,
  "id": 51329,
  "job": "Screenplay",
  "name": "Bradley Cooper",
  "profile_path": "/z5LUl9bljJnah3S5rtN7rScrmI8.jpg"
},
{
  "credit_id": "57ea3a27925141108f008807",
  "department": "Writing",
  "gender": 2,
  "id": 224385,
  "job": "Screenplay",
  "name": "Will Fetters",
  "profile_path": null
}
],

这是我的部分代码:

struct Cast: Codable {
    let character: String
    let name: String
    let profile_path: String?
}

struct Crew: Codable {
    let name: String
    let profile_path: String?
    let job: String
}

func loadCredits() {

    let id = filmId
    let apiKey = ""
    let url = URL(string: "https://api.themoviedb.org/3/movie/\(id)/credits?api_key=\(apiKey)")
    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: { (dataOrNil, response, error) in
        if let data = dataOrNil {
            do { let credit = try! JSONDecoder().decode(Credits.self, from: data)
                self.filmCast = credit.cast
                self.filmCrew = credit.crew


                self.castCollection.reloadData()

            }
        }

        self.castCollection.reloadData()

    })

    task.resume()
}

我可以使用它通过索引路径访问信息:

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

    let cell = castCollection.dequeueReusableCell(withReuseIdentifier: "castCell", for: indexPath) as! CastCell

        let credit = filmCast[indexPath.row]
        let name = credit.name

        cell.castName.text = name


        return cell


}

但如果数据不在 UICollectionView 等 IndexPath View 中，我在搜索数据时遇到问题。

因此，如果我想在 collectionview 之外搜索 job，即 Director，我正在尝试:

if filmCrew.job == "Director" {
 perform action here
  }

我收到错误:

Value of type '[DetailsView.Crew]' has no member 'job'

所以我的问题是如何正确搜索 JSON 数组以根据匹配值找到数据的匹配 {}。抱歉，如果这个问题听起来很愚蠢或令人困惑，自从使用字典和数组后我就遇到了问题。当我在表和 Collection View 中对其进行索引时，它总是工作正常，但我似乎无法弄清楚如何筛选数组。

Answer 1

您的条件需要遍历整个 filmCrew 数组并找到第一个拥有职位 "Director" 的用户，幸运的是有一种方法可以做到这一点。

if let director = filmCrew.first(where: { $0.job == "Director" }) {
    //perform action here
}