我一直在写一段代码来连接桌子上的设备。我能够发现设备并将它们加载到表中。在表内的行选择中，我请求连接所选设备。然而，didconnectperipheral从未被调用…
任何想法：
import UIKit
import CoreBluetooth
@objc protocol BLEDelegate: class {
func srgDiscoverServices(sender: BLEDiscovery, peripheral: CBPeripheral)
}
let bleDiscoverySharedInstance = BLEDiscovery()
//MARK: - UUIDS for StingRay Genessis M (SRG)
let StingRayGenesisMUUID = CBUUID (string: "346D0000-12A9-11CF-1279-81F2B7A91332") //Core UUID
//MARK: - Device and Characteristic Registers
var BLEDevices : [CBPeripheral] = [] //Device Array
var BLECharDictionary = [String: CBCharacteristic]() //Characteristic Dictionary
class BLEDiscovery: NSObject, CBCentralManagerDelegate {
private var centralManager : CBCentralManager?
weak var delegate: BLEDelegate?
override init() {
super.init()
let centralQueue = dispatch_queue_create("com.stingray", DISPATCH_QUEUE_SERIAL)
centralManager = CBCentralManager(delegate: self, queue: centralQueue)
}
// MARK: - CBCentralManager
func centralManagerDidUpdateState(central: CBCentralManager) {
switch (central.state) {
case CBCentralManagerState.PoweredOff:
print("CBCentralManagerState.PoweredOff")
case CBCentralManagerState.Unauthorized:
// Indicate to user that the iOS device does not support BLE.
print("CBCentralManagerState.Unauthorized")
break
case CBCentralManagerState.Unknown:
// Wait for another event
print("CBCentralManagerState.Unknown")
break
case CBCentralManagerState.PoweredOn:
print("CBCentralManagerState.PoweredOn")
self.startScanning()
case CBCentralManagerState.Resetting:
print("CBCentralManagerState.Resetting")
case CBCentralManagerState.Unsupported:
print("CBCentralManagerState.Unsupported")
break
}
}
// MARK: - Start scanning for StringRay devices with the appropriate UUID
func startScanning() {
if let central = centralManager {
central.scanForPeripheralsWithServices([StingRayGenesisMUUID], options: nil)
}
}
// MARK: - CB Central Manager - Did discover peripheral (follows : startScanning)
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
print("BLEDiscovery :: didDiscoverPeripheral :: ", peripheral.name)
//Check if new discovery and append to BLEDevices where required
if BLEDevices.contains(peripheral) {
}
else{
BLEDevices.append(peripheral)
}
//Change to BLEDevices - therefore update MianViewController, but check that the view is loaded
if MainViewController().deviceTableView != nil {
print("BLEDiscovery :: deviceTableView :: ")
MainViewController().relaodDeviceTable()
}
}
// MARK: - CB Central Manager - Connect and Disconnet BLE Devices
func connectBLEDevice (peripheral: CBPeripheral){
print("BLEDiscovery :: connectBLEDevice :: ", peripheral.name)
//Connect
let peripheralConnect : CBPeripheral = peripheral
self.centralManager!.connectPeripheral(peripheralConnect, options: nil)
}
func disconnectBLEDevice (peripheral: CBPeripheral){
print("BLEDiscovery :: disconnectBLEDevice :: ", peripheral.name)
//Disconnect
let peripheralDisconnect : CBPeripheral = peripheral
self.centralManager?.cancelPeripheralConnection(peripheralDisconnect)
}
// MARK: - CB Central Manager - Did Connect Device
func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
print("BLEDiscovery :: didConnectPeripheral :: ", peripheral.name)
delegate?.srgDiscoverServices(self, peripheral: peripheral)
}
func centralManager(central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: NSError?) {
//error handling
if (error != nil) {
print("!!Error - BLE Discovery - didDisconnectPeripheral - Error :: \(error)")
return
}
//On disconnect remove device from register
if let index = BLEDevices.indexOf(peripheral) {
BLEDevices.removeAtIndex(index)
}
//Change to BLEDevices - therefore update MianViewController
MainViewController().relaodDeviceTable()
}
func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
//error handling
if (error != nil) {
print("!!Error - BLE Discovery - didFailToConnectPeripheral - Error :: \(error)")
return
}
//Change to BLEDevices - therefore update MianViewController
MainViewController().relaodDeviceTable()
}
}
我知道代码是从表中调用的，因为我可以在日志窗口中观察“bleDiscovery：：connectbleDevice:：”，peripheral.name“。
我在这里调用connect和disconnect从：
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("MainViewController :: didSelectRowAtIndexPath :: Row :: ", deviceTableView.indexPathForSelectedRow?.row)
let peripheral : CBPeripheral = BLEDevices[(deviceTableView.indexPathForSelectedRow?.row)!]
switch peripheral.state{
case .Connected:
//Disconnect as device is connected
BLEDiscovery().disconnectBLEDevice(peripheral)
case .Disconnected:
//Connect as device as disconnected
BLEDiscovery().connectBLEDevice(peripheral)
default: break
}
}
最佳答案
像BLEDiscovery这样的对象最好实现为单例，或者可以使用Dependency Injection，但最主要的是拥有类的单个实例。
您正在使用globals来实现这一点，但是您在didSelectRowAtIndexPath函数中出现了错误。当你说
case .Connected:
//Disconnect as device is connected
BLEDiscovery().disconnectBLEDevice(peripheral)
您将创建一个新的本地
BLEDiscovery实例，它包含自己的CBCentralManager，这是您要求执行连接的中心。一旦退出case语句，这个本地BLEDiscovery将被释放，因此委托方法永远不会被调用。如果将外围设备数组封装在BLEDiscovery类中而不是使用全局数组，则可能发现了此错误，因为在访问该数组之前必须获取BLEDiscovery引用，并且会引发数组边界异常，因为该数组将为空。您可以将
BLEDiscovery重新构造为一个单体并消除全局变量：class BLEDiscovery: NSObject, CBCentralManagerDelegate {
static let sharedInstance = BLEDiscovery()
private static var initialised = false
private var centralManager : CBCentralManager!
weak var delegate: BLEDelegate?
//MARK: - UUIDS for StingRay Genesis M (SRG)
let stingRayGenesisMUUID = CBUUID (string: "346D0000-12A9-11CF-1279-81F2B7A91332") //Core UUID
//MARK: - Device and Characteristic Registers
var bleDevices : [CBPeripheral] = [] //Device Array
var bleCharDictionary = [String: CBCharacteristic]() //Characteristic Dictionary
override init() {
assert(!BLEDiscovery.initialised, "Illegal call to initializer - use sharedInstance")
BLEDiscovery.initialised = true
super.init()
let centralQueue = dispatch_queue_create("com.stingray", DISPATCH_QUEUE_SERIAL)
centralManager = CBCentralManager(delegate: self, queue: centralQueue)
}
// Rest of methods largely unchanged, although you should use `self.bleDevices` etc
现在，当您想要
BLEDiscovery的实例时，可以使用BLEDiscovery.sharedInstance例如。func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("MainViewController :: didSelectRowAtIndexPath :: Row :: ", deviceTableView.indexPathForSelectedRow?.row)
let bleDiscovery = BLEDiscovery.sharedInstance
let peripheral = bleDiscovery.bleDevices[indexPath.row]
switch peripheral.state{
case .Connected:
//Disconnect as device is connected
bleDiscovery.disconnectBLEDevice(peripheral)
case .Disconnected:
//Connect as device as disconnected
bleDiscovery.connectBLEDevice(peripheral)
default: break
}
}
关于swift - 永远不会调用centralManager didConnectPeripheral，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38192535/