从主应用程序目标 SwiftUI 访问 WidgetKit IntentTimelineProvider答案

【问题标题】：Accessing WidgetKit IntentTimelineProvider from main app target SwiftUI从主应用程序目标 SwiftUI 访问 WidgetKit IntentTimelineProvider
【发布时间】：2021-11-22 20:37:10
【问题描述】：

我正在尝试从主应用访问 IntentTimelineProvider 或 WidgetExtension。我这样做是为了从IntentTimelineProvider 获取日期属性，并在主应用程序目标的视图中使用它，如您从下面的代码中看到的那样。

我已将文件的目标成员资格（主应用程序目标中的文件和小部件扩展目标中的文件）设置为应用程序和小部件。

小部件扩展


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)
    }

//build time error here: "Reference to invalid associated type 'Entry' of type 'Provider'" here...
    func getTimeline(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
        var entries = [SimpleEntry]()
        let currentDate = Date()
        let midnight = Calendar.current.startOfDay(for: currentDate)
        let nextMidnight = Calendar.current.date(byAdding: .day, value: 1, to: midnight)!

        for offset in 0 ..< 60 * 24 {
           let entryDate = Calendar.current.date(byAdding: .minute, value: offset, to: midnight)!
            entries.append(SimpleEntry(date: entryDate, configuration: configuration))
        }

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

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

struct TimeWidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        NotingView(entry: entry)
    }
}

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

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

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

主应用

import SwiftUI

struct SampleView: View {
    var entry : Provider.Entry
    var body: some View {
        Text(entry.date, style: .time)
    }
}

我目前收到构建时间错误： " 对“Provider”类型的无效关联类型“Entry”的引用 " getTimeline() 函数。

【问题讨论】：

标签： swiftui widgetkit

【解决方案1】：

在您的主应用程序中，使用SimpleEntry 而不是Provider.Entry。后者引用了 TimelineProvider 协议实现的相关类型，但无论出于何种原因，应用程序都无法推断出类型（也许有人比我更精通 Swift）。但是你不需要推断它，只需给它实际的类型：SimpleEntry。

struct SampleView: View {
    var entry : SimpleEntry
    var body: some View {
        Text(entry.date, style: .time)
    }
}

【讨论】：