从主应用程序目标 SwiftUI 访问 WidgetKit IntentTimelineProvider

Posted 2023-02-18

【中文标题】从主应用程序目标 SwiftUI 访问 WidgetKit IntentTimelineProvider

【英文标题】：Accessing WidgetKit IntentTimelineProvider from main app target SwiftUI

【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。

【参考方案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)