我对SwiftUI和Firebase仍然比较新。最近，作为一项兴趣爱好，我一直在开发一款面向我的学校的应用程序。在Xcode 12发布之后，我决定尝试使用诸如小部件之类的新功能。但是，由于我的应用程序从Firebase获取数据，所以我遇到了一些问题。我最近的问题是："线程1：“无法获取FirebaseApp实例。请在使用Firestore之前调用FirebaseApp.configure()。” 我不确定在小部件中放置“FirebaseApp.configure()”代码应该放在哪里，因为该小部件没有AppDelegate.swift文件。下面是我的代码。
编辑： 我重新排列了代码，现在我正在从原始iOS应用程序数据模型中获取数据。因此，在小部件的Swift文件中，我不再导入Firebase。但是，我仍然遇到相同的错误（“SendProcessControlEvent:toPid:遇到错误：Error Domain=com.apple.dt.deviceprocesscontrolservice Code=8”，以及“->0x7fff5bb6933a <+10>: jae 0x7fff5bb69344 ; <+20> - 线程1：“无法获取FirebaseApp实例。请在使用Firestore之前调用FirebaseApp.configure()。”）。我还包括了@Wendy Liga的代码，但我仍然遇到了相同的错误。下面是我的更新代码：
iOS应用程序数据模型
import Foundation
import SwiftUI
import Firebase
import FirebaseFirestore
struct Assessment: Identifiable {
var id:String = UUID().uuidString
var Subject:String
var Class:Array<String>
var Day:Int
var Month:String
var Title:String
var Description:String
var Link:String
var Crit:Array<String>
}
class AssessmentsViewModel:ObservableObject {
@Published var books = [Assessment]()
private var db = Firestore.firestore()
// Add assessment variables
@Published var AssessmentSubject:String = ""
//@Published var AssessmentClass:Array<String> = [""]
@Published var AssessmentDay:Int = 1
@Published var AssessmentMonth:String = "Jan"
@Published var AssessmentTitle:String = ""
@Published var AssessmentDescription:String = ""
@Published var AssessmentLink:String = ""
@Published var AssessmentCrit:Array<String> = [""]
@Published var AssessmentDate:Date = Date()
func fetchData() {
db.collection("AssessmentsTest").order(by: "date").addSnapshotListener { (QuerySnapshot, error) in
guard let documents = QuerySnapshot?.documents else {
print("No documents")
return
}
self.books = documents.map { (QueryDocumentSnapshot) -> Assessment in
let data = QueryDocumentSnapshot.data()
let Subject = data["subject"] as? String ?? ""
let Class = data["class"] as? Array<String> ?? [""]
let Day = data["day"] as? Int ?? 0
let Month = data["month"] as? String ?? ""
let Title = data["title"] as? String ?? ""
let Description = data["description"] as? String ?? ""
let Link = data["link"] as? String ?? ""
let Crit = data["crit"] as? Array<String> ?? [""]
return Assessment(Subject: Subject, Class: Class, Day: Day, Month: Month, Title: Title, Description: Description, Link: Link, Crit: Crit)
}
}
}
func writeData() {
let DateConversion = DateFormatter()
DateConversion.dateFormat = "DD MMMM YYYY"
let Timestamp = DateConversion.date(from: "20 June 2020")
db.collection("AssessmentsTest").document(UUID().uuidString).setData([
"subject": AssessmentSubject,
"month": AssessmentMonth,
"day": AssessmentDay,
"title": AssessmentTitle,
"description": AssessmentDescription,
"link": AssessmentLink,
"crit": AssessmentCrit,
"date": AssessmentDate
]) { err in
if let err = err {
print("Error writing document: \(err)")
} else {
print("Document successfully written!")
}
}
}
}
小部件视图
struct WidgetsMainView: View {
@ObservedObject private var viewModel = AssessmentsViewModel()
var body: some View {
HStack {
Spacer().frame(width: 10)
VStack(alignment: .leading) {
Spacer().frame(height: 10)
ForEach(self.viewModel.books) { Data in
HStack {
VStack {
Text(String(Data.Day))
.bold()
.font(.system(size: 25))
Text(Data.Month)
}
.padding(EdgeInsets(top: 16, leading: 17, bottom: 16, trailing: 17))
.background(Color(red: 114/255, green: 112/255, blue: 110/255))
.foregroundColor(Color.white)
.cornerRadius(10)
VStack(alignment: .leading, spacing: 0) {
Text("\(Data.Subject) Crit \(Data.Crit.joined(separator: " + "))")
.bold()
if Data.Title != "" {
Text(Data.Title)
} else {
Text(Data.Class.joined(separator: ", "))
}
}
.padding(.leading, 10)
}
}
.onAppear {
viewModel.books.prefix(2)
}
Spacer()
}
Spacer()
}
}
}
主要的小部件
class AppDelegate: NSObject, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
FirebaseApp.configure()
return true
}
}
@main
struct AssessmentsWidget: Widget {
@UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
private let kind: String = "Assessments Widget"
public var body: some WidgetConfiguration {
StaticConfiguration(kind: kind, provider: Provider(), placeholder: PlaceholderView()) { entry in
AssessmentsWidgetEntryView(entry: entry)
}
.configurationDisplayName("Assessments Widget")
.description("Keep track of your upcoming assessments.")
.supportedFamilies([.systemMedium])
}
}
