Question

我在El Capitan上有以下非常简单的代码片段，它基本上是扫描BLE外围设备并连接到我想要的那个。然而，didDiscoverPeripheral永远不会被调用！它开始扫描但从未找到任何外围设备。对未来澄清要求的一些答案：

我在附近有BLE设备做广告。例如，我可以通过电话看到它们。
代码检查BLE是否已通电。
下面有很多类似的问题，但是没有一个问题对我有帮助。

代码如下：

import Cocoa
import CoreBluetooth

class ViewController: NSViewController, CBPeripheralDelegate, CBCentralManagerDelegate {

var centralManager: CBCentralManager!
var peripheral: CBPeripheral!
let DEVICE_NAME = "something"
var currentCharacteristic: CBCharacteristic! = nil

// Put CentralManager in the main queue
required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    self.startManager()

}

override func viewDidLoad() {
    super.viewDidLoad()

    self.startManager()
    // Do any additional setup after loading the view.
}

override var representedObject: Any? {
    didSet {
    // Update the view, if already loaded.
    }
}

func startManager(){
    centralManager = CBCentralManager(delegate: self, queue: DispatchQueue.main)
}

func centralManagerDidUpdateState(_ central: CBCentralManager) {
    switch (central.state)
    {
    case CBCentralManagerState.unsupported:
        print("BLE Unsupported")
        break
    case CBCentralManagerState.unauthorized:
        print("BLE unauthorized")
        break
    case CBCentralManagerState.poweredOff:
        print("BLE is not on.")
        break
    case CBCentralManagerState.poweredOn:
        print("BLE is on.")
        print("Scanning...")
        self.centralManager?.scanForPeripherals(withServices: nil, options: nil)
        break
    case CBCentralManagerState.unknown:
        print("BLE state unknown")
        break
    default:
        print("BLE state default.")
    }
}

func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
    // This is NEVER called!
    print("Peripheral: \(peripheral)")
    if (peripheral.name != nil && peripheral.name! == DEVICE_NAME){
        self.peripheral = peripheral
        self.centralManager.connect(self.peripheral, options: [CBConnectPeripheralOptionNotifyOnDisconnectionKey : true])
    }
}

func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
    peripheral.delegate = self
    peripheral.discoverServices(nil)
    print("Connected to \(peripheral)")
    self.stopScan()
}

func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?){
    print("connection failed", error)
}

func stopScan(){
    self.centralManager.stopScan()
}


func centralManager(central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: NSError?){
    if self.peripheral != nil {
        self.peripheral.delegate = nil
        self.peripheral = nil
    }
    print("Disconnected.", error)
    self.startManager()
}
}

知道什么是错的吗？

didDiscoverPeripheral从未在Swift中调用过

0 个答案: