我最近从 Swift 3 升级到 Swift 4,从 iOS 10.3.3 升级到 iOS 11.1。
我正在开发一个使用 BLE 进行双向通信的应用程序。工作流程如下:
- 外围 - 宣传身份
- CENTRAL - 接收身份(处理它...)
- CENTRAL - 响应外围设备
- PERIPHERAL - 接收来自中央的响应
- 完成
我的代码在更新之前运行良好,但现在不行了。在第 4 步结束时,我执行以下行:
peripheral.writeValue(encryptedData!, for: characteristic, type: .withResponse)
这应该调用以下委托(delegate)方法,但它没有:
public func peripheral(_ peripheral: CBPeripheral, didWriteValueFor descriptor: CBDescriptor, error: Error?) {
print("Did Write")
print("Error=\(error?.localizedDescription)")
}
它还应该(并且正在调用)外围设备上的以下委托(delegate)方法,但它没有:
public func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveWrite requests: [CBATTRequest]) {
print("did receive write request")
}
服务和特性设置如下:
let prefs = Preferences()
let strServiceUUID = prefs.GetString(key: Preferences.PREF_IDENTITY_SERVICE_UUID, defaultVal: "")!
let strCharacteristicUUID = prefs.GetString(key: Preferences.PREF_IDENTITY_CHARACTERISTIC_UUID, defaultVal: "")!
print("ServiceUUID=\(strServiceUUID)")
print("CharacteristicUUID=\(strCharacteristicUUID)")
mServiceUUID = CBUUID(string: strServiceUUID)
mCharacterUUID = CBUUID(string: strCharacteristicUUID)
mCBBluetoothServices = CBMutableService(type: mServiceUUID, primary: true)
//lets configure the data we want to advertise for
var characteristics : [CBCharacteristic] = []
//let strData : String = "933911"
//let data = strData.data(using: .utf8)
let cbProperties: CBCharacteristicProperties = [.read, .write, .notify]
let cbPermissions: CBAttributePermissions = [.readable, .writeable]
mIdentityObjectCharacteristic = CBMutableCharacteristic(type: mCharacterUUID,
properties: cbProperties,
value: nil,
permissions: cbPermissions)
characteristics.append(mIdentityObjectCharacteristic)
mCBBluetoothServices.characteristics = characteristics
mCBPeripheralManager.add(mCBBluetoothServices)
最佳答案
我不确定为什么升级操作系统和 Swift 版本会破坏您的代码,但是,在我看来您可能使用了错误的委托(delegate)方法?
尝试使用这个
func peripheral(CBPeripheral, didWriteValueFor: CBCharacteristic, error: Error?)
而不是这个
func peripheral(CBPeripheral, didWriteValueFor: CBDescriptor, error: Error?)
关于ios - 未调用 BLE 外设委托(delegate),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47341817/