ios - swift:通过单击按钮与蓝牙设备配对

Question

到目前为止，iPhone 已在打开应用程序时与蓝牙设备配对，但我想通过单击按钮进行配对。我尝试将所有扫描和连接功能放入 IBAction 中，但是当我按下按钮时什么也没有发生。在 IBAction 之后的第一个函数中，我有一个打印输出来检查它是否进入了该函数，但我没有得到打印。我还尝试在 manager.scanForPeripherals 之后延迟，但也不起作用。我在这里缺少什么？有人知道吗？感谢您的回复!这是我的代码(没有延迟):

var manager: CBCentralManager!
var device: CBPeripheral?
var characteristics: [CBCharacteristic]?
var serviceUUID = "1234"
var char1 = "FFE1"
let deviceName = "HMSoft"
var connected = CBPeripheralState.connected
var disconnected = CBPeripheralState.disconnected

 override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    manager = CBCentralManager(delegate: self, queue: nil)


}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.


}
 func centralManagerDidUpdateState(_ central: CBCentralManager) {
    switch central.state {
    case .poweredOn: break
        // manager.scanForPeripherals(withServices: nil, options: nil)
    case .unknown: break

    case .resetting: break

    case .unsupported: break

    case .unauthorized: break

    case .poweredOff:

        break

    }
}


   @IBAction func connectBluetooth(_ sender: Any) {

   manager.scanForPeripherals(withServices: nil, options: nil)

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

    if let peripheralName = advertisementData[CBAdvertisementDataLocalNameKey] as? String {

        if peripheralName == self.deviceName {

            // save a reference to the sensor tag
            self.device = peripheral
            self.device!.delegate = self

            // Request a connection to the peripheral

            self.manager.connect(self.device!, options: nil)

            print("Check")
        }
    }
}

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {

    peripheral.discoverServices(nil)
}


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

    if error != nil {

        return
    }


    if let services = peripheral.services {
        for service in services {

            if (service.uuid == CBUUID(string: serviceUUID)) {
                peripheral.discoverCharacteristics(nil, for: service)
            }
        }
    }

}


func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {

    device = peripheral
    characteristics = service.characteristics

}

func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
    if error != nil {

        return
    }
}

}

Answer 1

当您初始化CBCentralManager并设置其委托(delegate)时，委托(delegate)将开始接收事件。

因此，如果您只希望 CBCentralManager 在用户点击按钮后激活，而不是在屏幕加载后立即激活，那么您至少需要移动初始化代码manager 从 viewDidLoad 到按钮操作。

所以:

将 manager = CBCentralManager(delegate: self,queue: nil) 从 viewDidLoad 移动到 @IBAction func connectBluetooth(_ sender: Any) ,

从 IBAction 中删除对 scanForPeripherals 的调用，并且；

取消注释 centralManagerDidUpdateState 中的 //manager.scanForPeripherals(withServices: nil, options: nil)。