Swift BLE“didDiscoverServices”没有执行。我错过了什么吗？

Question

我一直在阅读教程，使用Adafruit的nRF8001并通过Arduino将其连接到iOS设备。到目前为止，我已经正确设置了一切，它在他们的应用程序中正常工作。
我试图写我自己的应用程序，（现在）完全一样的东西，我阅读他们的教程，并从我的理解我复制代码尽可能接近，到目前为止我可以得到连接和大多数事情似乎是工作（UI明智），但我似乎无法做任何事情过去连接到设备：
这里是我的代码之后连接：

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) { 
     //What to do when it discovers a peripheral, add it to the array list 
     print("Peripheral found: " + (peripheral.name ?? "Unknown Name")) 
     peripheralsFoundNames.append((peripheral.name ?? "Unknown Name")) 
     peripheralsFoundData.append((advertisementData.description)) 
     peripheralsFoundCB.append(peripheral) 
     peripheralsFoundRSSIs.append(RSSI) 
    } 

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) { 
     print("Connected to device!") 
     displayStatusAlert(localmsg: "Connection Succesful!") 
     NotificationCenter.default.post(name: Notification.Name(rawValue: DEVICE_READY_KEY), object: self) 
     data?.length = 0 //clear any data that might be stored 
     peripheral.discoverServices([BLETemperatureService]) 
     print("Here at didConnect, connected to:" + peripheral.name!) 
     // Here needs to add code to check if it's a single or multi-channel device via the advertisement data or some other constant, maybe the name? 
    } 

正如你所看到的，我打电话显式peripheral.discoverServices，然后我有一个执行的打印语句。然后，我有以下线以下（注：没有人可以执行AT ANY TIME（至少不是打印语句）。

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) { 
    print("here at diddisoverservices") 
     if ((error) != nil){ 
      displayStatusAlert(localmsg: "Error: \n" + (error?.localizedDescription ?? "Error Unknown")) 
     } 

     guard let services = peripheral.services 
      else{ 
       return 
     } 

     for service in services { 
      peripheral.discoverCharacteristics(nil, for: service) 

     } 
     print ("Discovered!") 
    } 


    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) { 
     if ((error) != nil){ 
      displayStatusAlert(localmsg: "Error: \n" + (error?.localizedDescription ?? "Error Unknown")) 
     } 

     guard let characteristics = service.characteristics 
      else{ 
       return 
     } 
     for characteristic in characteristics { 
      //looks for the right characteristic 
      print("looking for characteristic") 


      if characteristic.uuid.isEqual(BLERXCharacteristic) { 
       deviceConnectedRXChar = characteristic 

       //Once found, subscribe to the this particular characteristic 
       peripheral.setNotifyValue(true, for: deviceConnectedRXChar!) 

       peripheral.readValue(for: characteristic) 
       print("Rx Characteristic: \(characteristic.uuid)") 
      } 
      if characteristic.uuid.isEqual(BLETXCharacteristic){ 
       deviceConnectedTXChar = characteristic 
       print("Tx Characteristic: \(characteristic.uuid)") 
      } 
      peripheral.discoverDescriptors(for: characteristic) 
     } 

     print ("Characteristic discovered") 
    } 

    func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) { 

     if characteristic == deviceConnectedRXChar { 
      if let ASCIIstring = NSString(data: characteristic.value!, encoding: String.Encoding.utf8.rawValue) { 
       receivedDataString = ASCIIstring 
       print("Value Recieved: \((receivedDataString as String))") 
       NotificationCenter.default.post(name: Notification.Name(rawValue: DEVICE_SENT_DATA), object: nil) 

      } 
     } 

Answer 1

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?)是一个CBPeripheralDelegate方法

所以你缺少什么。只是做peripheral.discoverServices([BLETemperatureService])之前设置CBPeripheral对象delegate

所以，你需要做的peripheral.delegate = self