Apple iOS Swift5 BLE -如何发送一个字节到一个特征(写函数需要数据类型，但一个字节是"UInt8“类型)

import CoreBluetooth

class MyBluetoothManager: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate {
    var centralManager: CBCentralManager!
    var peripheral: CBPeripheral!
    var targetCharacteristic: CBCharacteristic!
    
    override init() {
        super.init()
        centralManager = CBCentralManager(delegate: self, queue: nil)
    }
    
    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        if central.state == .poweredOn {
            centralManager.scanForPeripherals(withServices: nil, options: nil)
        }
    }
    
    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        if peripheral.name == "YourPeripheralName" {
            self.peripheral = peripheral
            self.peripheral.delegate = self
            centralManager.stopScan()
            centralManager.connect(peripheral, options: nil)
        }
    }
    
    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        peripheral.discoverServices(nil)
    }
    
    func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
        guard let services = peripheral.services else { return }
        
        for service in services {
            peripheral.discoverCharacteristics(nil, for: service)
        }
    }
    
    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
        guard let characteristics = service.characteristics else { return }
        
        for characteristic in characteristics {
            if characteristic.uuid == CBUUID(string: "YourCharacteristicUUID") {
                targetCharacteristic = characteristic
                // 发送一个字节到特征
                let data = Data([0x01]) // 你要发送的字节
                peripheral.writeValue(data, for: characteristic, type: .withResponse)
            }
        }
    }
}