如何刷新小部件数据？

问题描述

我的代码获取了两个JSON变量，并将其显示在我的窗口小部件上。窗口小部件保持空白。没有小部件，它将向我显示应用程序中所有正确的东西。

我在做什么错？代码中的API仅用于测试，因此您也可以进行检查。我需要更改使其在小部件中显示吗？

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
}

获取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()
        }
    }
}

显示小部件：

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,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，但正如我所说的是空白。

解决方法

您不能像平常在应用程序中那样使用ObservedObject。

在小部件中，您使用TimelineProvider为视图创建Entry。

在您的TimelineEntry中添加另一个属性，我们称其为clubName：

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

更新NetworkManager并在completion中返回结果：

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完成时使用TimelineProvider中的fetchData，并创建时间线条目：

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)
        }
    }
}

在视图主体中使用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:)。

如果您需要在任何时候手动重新加载时间轴，只需致电：

WidgetCenter.shared.reloadAllTimelines()

这将在App和Widget中都起作用。

_{这是一个GitHub repository，带有不同的窗口小部件示例，包括网络窗口小部件。}

swift swift swift swift swiftui widget widgetkit