在Apple iOS Swift5中,要发送一个字节到一个特征,可以使用以下步骤:
CBPeripheral
对象,该对象代表了你要通信的外设。你可以使用外设的唯一标识符来初始化该对象。CBCentralManager
的scanForPeripherals
方法来扫描外设,然后使用CBPeripheral
的discoverServices
方法来发现外设的服务。CBPeripheralDelegate
的peripheral:didDiscoverServices
方法中,遍历外设的服务,然后使用discoverCharacteristics
方法来发现每个服务的特征。CBPeripheralDelegate
的peripheral:didDiscoverCharacteristicsForService:error
方法中,找到你要通信的特征。然后,使用writeValue
方法来发送字节到该特征。下面是一个示例代码:
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)
}
}
}
}
请注意,上述代码仅为示例,你需要根据你的实际情况进行适当的修改。
关于BLE(蓝牙低功耗)的更多信息,你可以参考以下链接:
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