JSON 在 CollectionView 中解码时解码器错误

Question

我正在获取一组 url 并在集合视图中对它们进行解码。我之前已经成功完成此操作，但这次收到错误消息。

我收到错误消息：

Swift.DecodingError.dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.})))

我注意到，如果可能的话，它似乎试图在完成另一个之前解码一个。我相信这是因为有时我运行应用程序会在抛出错误之前打印一两个解码数据实例。

这是我的代码：

struct Details: Codable {
    let name: String
    let location: Location
}

struct Location: Codable {
    let address: Address
    let geoCode: Geo
}

struct Geo: Codable {
    let latitude: String
    let longitude: String
}

struct Address: Codable {
    let street: String
    let state: String
    let city: String
    let postalCode: String
    let country: String
}

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

 let cell = showtimesCollection.dequeueReusableCell(withReuseIdentifier: "timeCell", for: indexPath) as! TimeCell

let theaters = self.theaterIds[indexPath.row]
    let id = theaters
    let apiKey = ""
    let url = URL(string: "http://data.tmsapi.com/v1.1/theatres/\(id)?api_key=\(apiKey)")
    print(url!)
    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 theater = try JSONDecoder().decode(Details.self, from: data) //error: Swift.DecodingError.dataCorrupted
                print(theater)

            } catch let err {
                print("JSON Error")
        }
    })

    task.resume()

return cell }

数组如下所示：

["12345", "23456", "34567", "45678"]

数组正在正确打印到控制台，正在解码的 url 也是如此。它们的显示方式与成功运行的控制器相同。

JSON 看起来像这样：

{
"theatreId": "2469",
"name": "Paramount Theatre",
"location": {
    "telephone": "512-472-5470",
    "geoCode": {
        "latitude": "30.2694",
        "longitude": "-97.7419"
    },
    "address": {
        "street": "713 Congress Ave",
        "state": "TX",
        "city": "Austin",
        "country": "USA",
        "postalCode": "78701"
    }
}
}

为什么我收到这个错误？如果我的理论是它试图加载每个太快，我怎么能让它等到第一个完成？

编辑：我在 JSON 解码器中添加了一个 catch 块，每次调用都会随机获得成功或错误。每次我运行应用程序时，它看起来都与此相似。

JSON Error
JSON Error
JSON Error
JSON Error
Details(name: "Paramount Theatre", location: Film_Bee.ShowtimesView.Location(address: Film_Bee.ShowtimesView.Address(street: "1245 Station Place", state: "TX", city: "Austin", postalCode: "12345", country: "USA"), geoCode: Film_Bee.ShowtimesView.Geo(latitude: "43.12345", longitude: "-44.12345")))
JSON Error

每次成功和错误的次数不同，顺序也不同。

编辑：我已经解决了这个问题并将解决方案作为答案发布。

另一个解决方案是在每次调用之间设置延迟。我怎样才能做到这一点？

Answer 1

问题是 API 每秒只允许 2 次调用，而我正在尝试进行更多调用。

要解决此问题，我必须使用 tmsapi 升级我的帐户。

JSON 在 CollectionView 中解码时解码器错误

JSON Decoder error when decoding in CollectionView

ios

json

swift

collectionview

jsondecoder