SwiftUI Fatal error: No ObservableObject of type “ ” found

Question

I am having the following fatal error:

SwiftUI Fatal error: No ObservableObject of type “ ” found and @EnvironmentObject error: may be missing as an ancestor of this view」 is occured.

Xcode version:

Xcode:12.1 and Core Bluetooth

My codes are as bellow:

ble.swift

import CoreBluetooth

・・・

class BLEConnection:NSObject, CBPeripheralDelegate,CBCentralManagerDelegate,ObservableObject 
{
　@EnvironmentObject var GS: GlobalStatus

　・・・・
  
  func startCentralManager()
  {
    //Process of start BLE Scan
  }

  public func centralManager(・・・) ←　Scanned Peripheral
  {
    let localName:String
   
    if(localName == GS.beaconid)　　←　★★★Fatal Error Occured this point.★★★
    {
　     ・・・・
    }
  ・・・・

GlobalStatus.swift

class GlobalStatus: ObservableObject
{
  @Published var beaconid = "ID001"
}

ProjectName.swift

@main
struct ProjectName: App
{
  let persistenceController = PersistenceController.shared
  
  var body: some Scene
  {
     WindowGroup
     {
       ContentView()
       .environment(\.managedObjectContext,persistenceController.container.viewContext)
       .environmentObject(GlobalStatus())   
     }  
  }
}

ContentView.swift

・・・
struct ContentView: View
{
  @ObservedObject var bke = BLEConnection()
  
  var body: some VIew
  {
    NavigationView
    {
       Text("Test")
    }.onAppear(perform: ble.startCentralManager)
  }
}

How can I resolve this problem? Thanks in advance.

user_12299030 · Answer

@EnvironmentObject is for SwiftUI view. In class just use regular property:

class BLEConnection:NSObject, CBPeripheralDelegate,CBCentralManagerDelegate,ObservableObject 
{
　var GS: GlobalStatus!
 
 // ...
}

and in your view just inject one into another (as one of approach)

struct ContentView: View
{
　@EnvironmentObject var GS: GlobalStatus
  @ObservedObject var bke = BLEConnection()
  
  var body: some VIew
  {
    NavigationView
    {
       Text("Test")
    }.onAppear {
       ble.GS = self.GS
       ble.startCentralManager()
    }
  }
}

SwiftUI Fatal error: No ObservableObject of type “ ” found

1 Answers