SwiftUI Bluetooth 使用

import SwiftUI
import CoreBluetooth
 
class Bluetooth: NSObject, CBCentralManagerDelegate, ObservableObject {
    
    @Published var bluetoothState = ""
    @Published var devices: [String] = []
    
    var centralManager: CBCentralManager!
    
    func start() {
        centralManager = CBCentralManager(delegate: self, queue: nil)
    }
    
    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        switch central.state {
          case .unknown:
            break
          case .resetting: break
          case .unsupported: break
          case .unauthorized: break
          case .poweredOff: break
          case .poweredOn:
            centralManager.scanForPeripherals(withServices: nil)
            break
        @unknown default: break
        }
        
        bluetoothState = "\(central.state)"
    }
    public func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        print("\(peripheral)")
        self.devices.append("\(peripheral)")
    }
 
    
    
}
 
struct ContentView: View {
    
    @ObservedObject var tooth = Bluetooth()
    
    var body: some View {
        VStack{
            Text("状态:\(self.tooth.bluetoothState)")
            Divider()
            List{
                ForEach(self.tooth.devices,id: \.self){ item in
                    Text("\(item)")
                }
            }
        }.onAppear(){ //等同于 UIKit的 viewDidAppear()
            self.tooth.start()
        }
    }
}