Question

我想要连接到蓝牙硬件，但是我无法收到通知，当值更新时，读取阅读，这是我的代码：

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {

    guard peripheral == self.peripheral && error == nil else {
        return
    }

    if let characteristics = service.characteristics {
        for characteristic in characteristics {
            if characteristic.UUID == QuadrarCharacteristicUUID {
                if let peripheral = self.peripheral {
                    self.quadrarCharacteristic = CBMutableCharacteristic(type: QuadrarCharacteristicUUID,
                        properties: [.Read, .Write, .Notify],
                        value: nil,
                        permissions: [.Readable, .Writeable])
                    self.quadrarCharacteristic?.descriptors = characteristic.descriptors
                    peripheral.setNotifyValue(true, forCharacteristic: self.quadrarCharacteristic!)
                }
            }
        }
    }
}

当我写作时：

 func writeBytes() {
           self.quadrarCharacteristic!.service.peripheral.writeValue(self.bytesToWriteArray[self.senderCounter], 
            forCharacteristic: self.quadrarCharacteristic!, type: CBCharacteristicWriteType.WithResponse)
    }

我知道，即使写作也没有用，因为

 func peripheral(peripheral: CBPeripheral, didWriteValueForCharacteristic characteristic: CBCharacteristic, error: NSError?)

未被调用... 但如果我只使用

var quadrarCharacteristic: CBCharacteristic?

并尝试编写它，作为非CBMutableCharacteristic，它可以工作，但我不能让通知工作...

Answer 1

当您作为中心时，您不会创建新的CBMutableCharacteristic，只需使用CBCharacteristic中提供给您的didDiscoverCharacteristicsForService个对象 -

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {

    guard peripheral == self.peripheral && error == nil else {
        return
    }

    if let characteristics = service.characteristics {
        for characteristic in characteristics {
            if characteristic.UUID == QuadrarCharacteristicUUID {
                self.quadrarCharacteristic=charateristic
                peripheral.setNotifyValue(true, forCharacteristic: self.quadrarCharacteristic!)
                }
            }
        }
    }
}

此外，您需要确认您的特性支持通知。

无法写入或读取CBPeripheral | CBMutableCharacteristic

1 个答案: