IOS迅速な3 - プリンタのBluetooth

Question

私はプリンタXcodeの上

でBluetooth経由で印刷するアプリを作成しようとしている、私はプリンタを接続することができるよ、とにもサービスやUUIDさんを見て、しかし、問題は、私がサービスの特徴を見てみると、ゼロであることが分かりました 誰かがその問題についてアイデアを持っていますか？

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) { 

    for service in peripheral.services! { 

     print("Service \(service)\n") 
     print("Discovering Characteristics for Service : \(service.uuid)") 
     print(service.characteristics) 

    } 
} 



override func viewDidLoad() { 
    super.viewDidLoad() 
    centralManager = CBCentralManager(delegate: self, queue: nil) 
} 

func centralManagerDidUpdateState(_ central: CBCentralManager) { 

if #available(iOS 10.0, *){ 
switch (central.state) { 
case CBManagerState.poweredOff: 
print("CBCentralManagerState.PoweredOff") 
case CBManagerState.unauthorized: 
print("CBCentralManagerState.Unauthorized") 
break 
case CBManagerState.unknown: 
print("CBCentralManagerState.Unknown") 
break 
case CBManagerState.poweredOn: 
print("CBCentralManagerState.PoweredOn") 
centralManager.scanForPeripherals(withServices: nil, options: nil) 
centralManager.scanForPeripherals(withServices: nil, options: nil) 
case CBManagerState.resetting: 
print("CBCentralManagerState.Resetting") 
case CBManagerState.unsupported: 
print("CBCentralManagerState.Unsupported") 
break 
}}else{ 
switch central.state.rawValue{ 
case 0: 
print("CBCentralManagerState.Unknown") 
break 
case 1: 
print("CBCentralManagerState.Resetting") 
case 2: 
print("CBCentralManagerState.Unsupported") 
break 
case 3: 
print("This app is not authorised to use Bluetooth low energy") 
break 
case 4: 
print("Bluetooth is currently powered off.") 
case 5: 
print("Bluetooth is currently powered on and available to use.") 
self.centralManager.scanForPeripherals(withServices: nil, options: nil) 
break 
default: 
    break 
}}} 

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) { 
    print("name : \(peripheral.name)") 


    let device = (advertisementData as NSDictionary) 
     .object(forKey: CBAdvertisementDataLocalNameKey) 
     as? NSString 

    if device?.contains(BEAN_NAME) == true { 
     self.centralManager.stopScan() 

     self.peripheral = peripheral 
     self.peripheral.delegate = self 
     print("peripheral: \(self.peripheral)") 
     centralManager.connect(peripheral, options: nil) 
     print("peripheral: \(self.peripheral)") 
    } 
} 

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


func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) { 
print(error) 
     for characteristic in service.characteristics! { 
      print(anything) 

} 


func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) { 
    print("Sent") 
} 

Answer 1

あなたのdidDiscoverServicesの重要なステップが欠落している - あなたは、あなたのperipheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?)デリゲートメソッド