RevDoc UserActivityView

RevDoc UserActivityView.swift

import SwiftUI
import CoreSpotlight
import MobileCoreServices

struct UserActivityView: View {
  @State var data: [String]
  @State var openedID = String()
  @State var alertPresented = false
  init() {
    if let stringArray = UserDefaults.standard.stringArray(forKey: "data") {
      self._data = State<[String]>(initialValue: stringArray)
    }
    else {
      var data = [String]()
      for _ in 1...10 {
        data.append(UUID().uuidString)
      }
      self._data = State<[String]>(initialValue: data)
      UserDefaults.standard.set(data, forKey: "data")
    }
  }
  func indexItem(atIndex index: Int) {
    let uuid = data[index]
    let attributeSet = CSSearchableItemAttributeSet(itemContentType: kUTTypeText as String)
    attributeSet.title = "A search item for my app"
    attributeSet.contentDescription = uuid
    
    let item = CSSearchableItem(uniqueIdentifier: uuid, domainIdentifier: "com.MyCompany", attributeSet: attributeSet)
    CSSearchableIndex.default().indexSearchableItems([item]) { error in
      if let error = error {
        assertionFailure("Failed to index with error\n\(error)")
      } else {
        print("Saved successfully")
      }
    }
  }
  
  func presentAlert(_ userActivity: NSUserActivity) {
    if let id = userActivity.userInfo?[CSSearchableItemActivityIdentifier] as? String {
      openedID = id
      alertPresented = true
    }
  }
  
  var body: some View {
    List(0..<data.count, id: \.self) { index in
      Button("\(data[index])") {
        indexItem(atIndex: index)
      }
    }
    .userActivity("com.MyCompany.MyApp.searchActivity", element: openedID) {
      string, activity in
      if !string.isEmpty {print("Updated \(string) \(activity.activityType)")}
    }
    .onContinueUserActivity("com.MyCompany.MyApp.searchActivity") { activity in
      print("Continue after Handoff")
    }
    .alert(isPresented: $alertPresented) {
      Alert(title: Text("onContinueUserActivity"), message: Text(openedID), dismissButton: .default(Text("Okay")))
    }
    .onContinueUserActivity(CSSearchableItemActionType, perform: presentAlert)
  }
}