swift - 如何刷新 WidgetKit 数据？

我的代码获取了两个JSON变量，并将其显示在我的窗口 WidgetKit 上。
窗口 WidgetKit 保持空白。没有 WidgetKit ，它向我显示了我的应用程序中所有正确的东西。
我究竟做错了什么？代码中的API仅用于测试，因此您也可以进行检查。
我需要更改使其在 WidgetKit 中显示吗？
我的结构:

import Foundation

struct Results: Decodable {
    let data: [Post]
}

struct Post: Decodable, Identifiable {
    let id: String
    var objectID: String {
        return id
    }
    let home_name: String
    let away_name: String
}

撷取JSON:

import Foundation

class NetworkManager: ObservableObject {

    @Published var posts = [Post]()

    @Published var test = ""
    @Published var test2 = ""

    func fetchData() {
        if let url = URL(string: "https://livescore-api.com/api-client/teams/matches.json?number=10&team_id=19&key=I2zBIRH3S01Kf0At&secret=6kLvfRivnqeNKUzsW84F0LISMJC1KdvQ&number=7&team_id=46") {
            let session = URLSession(configuration: .default)
            let task = session.dataTask(with: url) { (gettingInfo, response, error) in
                if error == nil {
                    let decoder = JSONDecoder()
                    if let safeData = gettingInfo {
                        do {
                            let results = try decoder.decode(Results.self, from: safeData)
                            DispatchQueue.main.async {
                                self.posts = results.data
                                self.test = results.data[0].away_name
                                self.test2 = results.data[0].home_name
                            }
                        } catch {
                            print(error)
                        }
                    }
                }
            }
            task.resume()
        }
    }
}

显示 WidgetKit :

import WidgetKit
import SwiftUI
import Intents

struct Provider: IntentTimelineProvider {
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), configuration: ConfigurationIntent())
    }

    func getSnapshot(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (SimpleEntry) -> ()) {
        let entry = SimpleEntry(date: Date(), configuration: configuration)
        completion(entry)
    }

    func getTimeline(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
        var entries: [SimpleEntry] = []

        // Generate a timeline consisting of five entries an hour apart, starting from the current date.
        let currentDate = Date()
        for hourOffset in 0 ..< 5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            let entry = SimpleEntry(date: entryDate, configuration: configuration)
            entries.append(entry)
        }

        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
    }
}

struct SimpleEntry: TimelineEntry {
    let date: Date
    let configuration: ConfigurationIntent
}

struct WidgetNeuEntryView : View {

    @ObservedObject var networkManager = NetworkManager()
    var entry: Provider.Entry
    var body: some View {
        Text(networkManager.test)
    }
}

@main
struct WidgetNeu: Widget {
    let kind: String = "WidgetNeu"

    var body: some WidgetConfiguration {
        IntentConfiguration(kind: kind, intent: ConfigurationIntent.self, provider: Provider()) { entry in
            WidgetNeuEntryView(entry: entry)
        }
        .configurationDisplayName("My Widget")
        .description("This is an example widget.")
    }
}

struct WidgetNeu_Previews: PreviewProvider {
    static var previews: some View {
        WidgetNeuEntryView(entry: SimpleEntry(date: Date(), configuration: ConfigurationIntent()))
            .previewContext(WidgetPreviewContext(family: .systemSmall))
    }
}

networkManager.test应该显示为文本，但是正如我所说的是空白的。

最佳答案

您不能像通常在应用程序中使用的那样使用ObservedObject。
在窗口 WidgetKit 中，您使用TimelineProvider为您的 View 创建一个Entry。

在您的TimelineEntry中添加另一个属性，我们称它为clubName:

struct SimpleEntry: TimelineEntry {
    let date: Date
    let clubName: String
}

更新NetworkManager并以completion返回结果:

class NetworkManager {
    func fetchData(completion: @escaping ([Post]) -> Void) {
        ...
        URLSession(configuration: .default).dataTask(with: url) { data, _, error in
            ...
            let result = try JSONDecoder().decode(Results.self, from: data)
            completion(result.data)
            ...
        }
        .resume()
    }
}

在NetworkManager中使用TimelineProvider并在fetchData完成时创建时间线条目:

struct Provider: TimelineProvider {
    var networkManager = NetworkManager()

    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), clubName: "Club name")
    }

    func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> Void) {
        let entry = SimpleEntry(date: Date(), clubName: "Club name")
        completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
        networkManager.fetchData { posts in
            let entries = [
                SimpleEntry(date: Date(), clubName: posts[0].home_name)
            ]
            let timeline = Timeline(entries: entries, policy: .never)
            completion(timeline)
        }
    }
}

在 View 主体中使用entry.clubName:

struct WidgetNeuEntryView: View {
    var entry: Provider.Entry

    var body: some View {
        VStack {
            Text(entry.date, style: .time)
            Text("Club: \(entry.clubName)")
        }
    }
}

请注意，在上面的示例中，重新加载策略设置为never，仅加载一次数据。
如果要自动重新加载时间轴，可以轻松将其更改为atEnd或after(date:)。
如果您需要随时手动重新加载时间轴，则可以致电:

WidgetCenter.shared.reloadAllTimelines()

这将在App和Widget中都适用。

这是一个GitHub repository，带有不同的窗口 WidgetKit 示例，包括网络窗口 WidgetKit 。

关于swift - 如何刷新 WidgetKit 数据？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/63976424/