iOS下无法使用Swift获取ESC/POS兼容BLE热敏打印机的打印响应。

首先，确保您已连接热敏打印机并获得了其服务和特征。然后，您可以使用CBCentralManager和CBPeripheralDelegate来实现BLE通信。以下是示例代码：

import CoreBluetooth

class PrinterManager: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate {

    var centralManager: CBCentralManager!
    var printerPeripheral: CBPeripheral!
    var printerServiceUUID: CBUUID!
    var printerCharacteristicUUID: CBUUID!

    override init() {
        super.init()

        centralManager = CBCentralManager(delegate: self, queue: nil)
        printerServiceUUID = CBUUID(string: "your printer service uuid")
        printerCharacteristicUUID = CBUUID(string: "your printer characteristic uuid")
    }

    // MARK: CBCentralManagerDelegate Methods

    func centralManagerDidUpdateState(_ central: CBCentralManager) {
        if central.state == .poweredOn {
            centralManager.scanForPeripherals(withServices: [printerServiceUUID], options: nil)
        }
    }

    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        if peripheral.name == "your printer name" {
            printerPeripheral = peripheral
            centralManager.connect(printerPeripheral, options: nil)
        }
    }

    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        peripheral.delegate = self
        peripheral.discoverServices([printerServiceUUID])
    }

    // MARK: CBPeripheralDelegate Methods

    func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
        if let services = peripheral.services {
            for service in services {
                peripheral.discoverCharacteristics([printerCharacteristicUUID], for: service)
            }
        }
    }

    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
        if let characteristics = service.characteristics {
            for characteristic in characteristics {
                if characteristic.uuid == printerCharacteristicUUID {
                    peripheral.setNotifyValue(true, for: characteristic)
                }
            }
        }