如何在 Intent Handler 中使用获取数据来编辑 Widget iOS 14？

问题描述

我目前正在使用 SwiftUI 开发应用程序。

我试图让 widget 用户可以使用 IntentConfiguration

编辑一些数据

我想在 CoreData 类中使用来自 IntentHandler 的一些获取数据来编辑小部件，如下图所示。

我尝试编写一些代码，但它们不起作用...

我该如何解决我的代码？

---

代码如下：

IntentHandler.swift

import WidgetKit
import SwiftUI
import CoreData
import Intents

class IntentHandler: INExtension,ConfigurationIntentHandling {
    
    var moc = PersistenceController.shared.managedobjectContext

    var timerEntity_0:TimerEntity?
    var timerEntity_1:TimerEntity?
    var timerEntity_2:TimerEntity?

    init(context : NSManagedobjectContext) {
        self.moc = context

        let request = NSFetchRequest<TimerEntity>(entityName: "TimerEntity")

        do{
            let result = try moc.fetch(request)
            timerEntity_0 = result[0]
            timerEntity_1 = result[1]
            timerEntity_2 = result[2]
        }
        catch let error as NSError{
            print("Could not fetch.\(error.userInfo)")
        }
    }
   
    func provideNameOptionsCollection(for intent: ConfigurationIntent,searchTerm: String?,with completion: @escaping (INObjectCollection<Nsstring>?,Error?) -> Void) {
        
        let nameIdentifiers:[Nsstring] = [
            Nsstring(string: timerEntity_0?.task ?? "default"),Nsstring(string: timerEntity_1?.task ?? "default"),Nsstring(string: timerEntity_2?.task ?? "default")
            // "meeting",// "cooking",// "shoping"
        ]
        let allNameIdentifiers = INObjectCollection(items: nameIdentifiers)
        
        completion(allNameIdentifiers,nil)
    }
    
    override func handler(for intent: INIntent) -> Any {
        
        return self
    }
}

Widget.swift

import WidgetKit
import SwiftUI
import Intents

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

    func getSnapshot(for configuration: ConfigurationIntent,in context: Context,completion: @escaping (SimpleEntry) -> ()) {
        let entry = SimpleEntry(date: Date(),configuration: configuration,name: "")
        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,name: configuration.Name ?? "")
            entries.append(entry)
        }

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

struct SimpleEntry: TimelineEntry {
    let date: Date
    let configuration: ConfigurationIntent
    var name:String
}

struct TimerIntentWidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        Text(entry.name)
            .font(.title)
        Text(entry.date,style: .time)
    }
}

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

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

tWidget.intentdeFinition

---

Xcode：版本 12.0.1

iOS：14.0

生命周期：SwiftUI 应用

解决方法

我可以使用从 CoreData 获取数据（如下面的代码）在小部件中显示一个列表：

---

IntentHandler.swift

import WidgetKit
import SwiftUI
import CoreData
import Intents

class IntentHandler: INExtension,ConfigurationIntentHandling {
    
    var moc = PersistenceController.shared.managedObjectContext

    var timerEntity_0:TimerEntity?
    var timerEntity_1:TimerEntity?
    var timerEntity_2:TimerEntity?

    func provideNameOptionsCollection(for intent: ConfigurationIntent,searchTerm: String?,with completion: @escaping (INObjectCollection<NSString>?,Error?) -> Void) {
        
        let request = NSFetchRequest<TimerEntity>(entityName: "TimerEntity")

        do{
            let result = try moc.fetch(request)
            timerEntity_0 = result[0]
            timerEntity_1 = result[1]
            timerEntity_2 = result[2]
        }
        catch let error as NSError{
            print("Could not fetch.\(error.userInfo)")
        }

        let nameIdentifiers:[NSString] = [
            NSString(string: timerEntity_0?.task ?? "default"),NSString(string: timerEntity_1?.task ?? "default"),NSString(string: timerEntity_2?.task ?? "default")
            // "meeting",// "cooking",// "shoping"
        ]
        let allNameIdentifiers = INObjectCollection(items: nameIdentifiers)
        
        completion(allNameIdentifiers,nil)
    }
    
    override func handler(for intent: INIntent) -> Any {
        
        return self
    }
}