所以我的问题是，当我选择连接到不同的故事板时，我的ble外设保持与手机的连接： 我用来扫描和连接ble外设的代码：
import Foundation
import UIKit
import CoreBluetooth
var txCharacteristic : CBCharacteristic?
var rxCharacteristic : CBCharacteristic?
var blePeripheral : CBPeripheral?
var characteristicASCIIValue = NSString()
class BLECentralViewController : UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate, UITableViewDelegate, UITableViewDataSource{
//Data
var centralManager : CBCentralManager!
var RSSIs = [NSNumber]()
var data = NSMutableData()
var writeData: String = ""
var peripherals: [CBPeripheral] = []
var characteristicValue = [CBUUID: NSData]()
var timer = Timer()
var characteristics = [String : CBCharacteristic]()
//UI
@IBOutlet weak var baseTableView: UITableView!
@IBOutlet weak var refreshButton: UIBarButtonItem!
@IBAction func refreshAction(_ sender: AnyObject) {
disconnectFromDevice()
self.peripherals = []
self.RSSIs = []
self.baseTableView.reloadData()
startScan()
}
override func viewDidLoad() {
super.viewDidLoad()
self.baseTableView.delegate = self
self.baseTableView.dataSource = self
self.baseTableView.reloadData()
/*Our key player in this app will be our CBCentralManager. CBCentralManager objects are used to manage discovered or connected remote peripheral devices (represented by CBPeripheral objects), including scanning for, discovering, and connecting to advertising peripherals.
*/
centralManager = CBCentralManager(delegate: self, queue: nil)
let backButton = UIBarButtonItem(title: "Disconnect", style: .plain, target: nil, action: nil)
navigationItem.backBarButtonItem = backButton
}
override func viewDidAppear(_ animated: Bool) {
disconnectFromDevice()
super.viewDidAppear(animated)
refreshScanView()
print("View Cleared")
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
print("Stop Scanning")
centralManager?.stopScan()
}
/*Okay, now that we have our CBCentalManager up and running, it's time to start searching for devices. You can do this by calling the "scanForPeripherals" method.*/
func startScan() {
peripherals = []
print("Now Scanning...")
self.timer.invalidate()
centralManager?.scanForPeripherals(withServices: nil , options: [CBCentralManagerScanOptionAllowDuplicatesKey:false])
Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(self.cancelScan), userInfo: nil, repeats: false)
}
/*We also need to stop scanning at some point so we'll also create a function that calls "stopScan"*/
@objc func cancelScan() {
self.centralManager?.stopScan()
print("Scan Stopped")
print("Number of Peripherals Found: \(peripherals.count)")
}
func refreshScanView() {
baseTableView.reloadData()
}
//-Terminate all Peripheral Connection
/*
Call this when things either go wrong, or you're done with the connection.
This cancels any subscriptions if there are any, or straight disconnects if not.
(didUpdateNotificationStateForCharacteristic will cancel the connection if a subscription is involved)
*/
func disconnectFromDevice () {
if blePeripheral != nil {
// We have a connection to the device but we are not subscribed to the Transfer Characteristic for some reason.
// Therefore, we will just disconnect from the peripheral
centralManager?.cancelPeripheralConnection(blePeripheral!)
}
}
func restoreCentralManager() {
//Restores Central Manager delegate if something went wrong
centralManager?.delegate = self
}
/*
Called when the central manager discovers a peripheral while scanning. Also, once peripheral is connected, cancel scanning.
*/
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral,advertisementData: [String : Any], rssi RSSI: NSNumber) {
blePeripheral = peripheral
self.peripherals.append(peripheral)
self.RSSIs.append(RSSI)
peripheral.delegate = self
self.baseTableView.reloadData()
if blePeripheral == nil {
print("Found new pheripheral devices with services")
print("Peripheral name: \(String(describing: peripheral.name))")
print("**********************************")
print ("Advertisement Data : \(advertisementData)")
}
}
//Peripheral Connections: Connecting, Connected, Disconnected
//-Connection
func connectToDevice () {
centralManager?.connect(blePeripheral!, options: nil)
print("Good luck")
print(blePeripheral!.discoverServices(nil))
print("Good luck")
}
/*
Invoked when a connection is successfully created with a peripheral.
This method is invoked when a call to connect(_:options:) is successful. You typically implement this method to set the peripheral’s delegate and to discover its services.
*/
//-Connected
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("*****************************")
print("Connection complete")
print("Peripheral info: \(String(describing: blePeripheral))")
//Stop Scan- We don't need to scan once we've connected to a peripheral. We got what we came for.
centralManager?.stopScan()
print("Scan Stopped")
//Erase data that we might have
data.length = 0
//Discovery callback
peripheral.delegate = self
//Only look for services that matches transmit uuid
peripheral.discoverServices([BLEService_UUID])
//Once connected, move to new view controller to manager incoming and outgoing data
let storyboard = UIStoryboard(name: "Main1", bundle: nil)
let uartViewController = storyboard.instantiateViewController(withIdentifier: "UartModuleViewController") as! UartModuleViewController
uartViewController.peripheral = peripheral
navigationController?.pushViewController(uartViewController, animated: true)
}
/*
Invoked when the central manager fails to create a connection with a peripheral.
*/
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
if error != nil {
print("Failed to connect to peripheral")
return
}
}
func disconnectAllConnection() {
centralManager.cancelPeripheralConnection(blePeripheral!)
}
/*
Invoked when you discover the peripheral’s available services.
This method is invoked when your app calls the discoverServices(_:) method. If the services of the peripheral are successfully discovered, you can access them through the peripheral’s services property. If successful, the error parameter is nil. If unsuccessful, the error parameter returns the cause of the failure.
*/
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
print("*******************************************************AAA")
if ((error) != nil) {
print("Error discovering services: \(error!.localizedDescription)")
return
}
guard let services = peripheral.services else {
return
}
//We need to discover the all characteristic
for service in services {
peripheral.discoverCharacteristics(nil, for: service)
print("god bless")
print(peripheral.discoverCharacteristics(nil, for: service))
print("god bless")
// bleService = service
}
print("Discovered Services: \(services)")
}
/*
Invoked when you discover the characteristics of a specified service.
This method is invoked when your app calls the discoverCharacteristics(_:for:) method. If the characteristics of the specified service are successfully discovered, you can access them through the service's characteristics property. If successful, the error parameter is nil. If unsuccessful, the error parameter returns the cause of the failure.
*/
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
print("*******************************************************")
if ((error) != nil) {
print("Error discovering services: \(error!.localizedDescription)")
return
}
guard let characteristics = service.characteristics else {
return
}
print("Found \(characteristics.count) characteristics!")
for characteristic in characteristics {
//looks for the right characteristic
if characteristic.uuid.isEqual(BLE_Characteristic_uuid_Rx) {
rxCharacteristic = characteristic
//Once found, subscribe to the this particular characteristic...
peripheral.setNotifyValue(true, for: rxCharacteristic!)
// We can return after calling CBPeripheral.setNotifyValue because CBPeripheralDelegate's
// didUpdateNotificationStateForCharacteristic method will be called automatically
peripheral.readValue(for: characteristic)
print("Rx Characteristic: \(characteristic.uuid)")
}
if characteristic.uuid.isEqual(BLE_Characteristic_uuid_Tx){
txCharacteristic = characteristic
print("Tx Characteristic: \(characteristic.uuid)")
}
peripheral.discoverDescriptors(for: characteristic)
}
}
// Getting Values From Characteristic
/*After you've found a characteristic of a service that you are interested in, you can read the characteristic's value by calling the peripheral "readValueForCharacteristic" method within the "didDiscoverCharacteristicsFor service" delegate.
*/
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
if characteristic == rxCharacteristic {
if let ASCIIstring = NSString(data: characteristic.value!, encoding: String.Encoding.utf8.rawValue) {
characteristicASCIIValue = ASCIIstring
print("Value Recieved: \((characteristicASCIIValue as String))")
NotificationCenter.default.post(name:NSNotification.Name(rawValue: "Notify"), object: nil)
}
}
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverDescriptorsFor characteristic: CBCharacteristic, error: Error?) {
print("*******************************************************")
if error != nil {
print("\(error.debugDescription)")
return
}
if ((characteristic.descriptors) != nil) {
for x in characteristic.descriptors!{
let descript = x as CBDescriptor?
print("function name: DidDiscoverDescriptorForChar \(String(describing: descript?.description))")
print("Rx Value \(String(describing: rxCharacteristic?.value))")
print("Tx Value \(String(describing: txCharacteristic?.value))")
}
}
}
func peripheral(_ peripheral: CBPeripheral, didUpdateNotificationStateFor characteristic: CBCharacteristic, error: Error?) {
print("*******************************************************")
if (error != nil) {
print("Error changing notification state:\(String(describing: error?.localizedDescription))")
} else {
print("Characteristic's value subscribed")
}
if (characteristic.isNotifying) {
print ("Subscribed. Notification has begun for: \(characteristic.uuid)")
}
}
func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
print("Disconnected")
}
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
guard error == nil else {
print("Error discovering services: error")
return
}
print("Message sent")
}
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor descriptor: CBDescriptor, error: Error?) {
guard error == nil else {
print("Error discovering services: error")
return
}
print("Succeeded!")
}
//Table View Functions
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.peripherals.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//Connect to device where the peripheral is connected
let cell = tableView.dequeueReusableCell(withIdentifier: "BlueCell") as! PeripheralTableViewCell
let peripheral = self.peripherals[indexPath.row]
let RSSI = self.RSSIs[indexPath.row]
if peripheral.name == nil {
cell.peripheralLabel.text = "nil"
} else {
cell.peripheralLabel.text = peripheral.name
}
cell.rssiLabel.text = "RSSI: \(RSSI)"
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
blePeripheral = peripherals[indexPath.row]
connectToDevice()
}
/*
Invoked when the central manager’s state is updated.
This is where we kick off the scan if Bluetooth is turned on.
*/
func centralManagerDidUpdateState(_ central: CBCentralManager) {
if central.state == CBManagerState.poweredOn {
// We will just handle it the easy way here: if Bluetooth is on, proceed...start scan!
print("Bluetooth Enabled")
startScan()
} else {
//If Bluetooth is off, display a UI alert message saying "Bluetooth is not enable" and "Make sure that your bluetooth is turned on"
print("Bluetooth Disabled- Make sure your Bluetooth is turned on")
let alertVC = UIAlertController(title: "Bluetooth is not enabled", message: "Make sure that your bluetooth is turned on", preferredStyle: UIAlertControllerStyle.alert)
let action = UIAlertAction(title: "ok", style: UIAlertActionStyle.default, handler: { (action: UIAlertAction) -> Void in
self.dismiss(animated: true, completion: nil)
})
alertVC.addAction(action)
self.present(alertVC, animated: true, completion: nil)
}
}
}
和代码
import UIKit
import CoreBluetooth
class UartModuleViewController: UIViewController, CBPeripheralManagerDelegate, UITextViewDelegate, UITextFieldDelegate {
//UI
@IBOutlet weak var baseTextView: UITextView!
@IBOutlet weak var sendButton: UIButton!
@IBOutlet weak var inputTextField: UITextField!
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var switchUI: UISwitch!
//Data
var centralManager : CBCentralManager!
var peripheralManager: CBPeripheralManager?
var peripheral: CBPeripheral!
private var consoleAsciiText:NSAttributedString? = NSAttributedString(string: "")
@IBAction func Discon(_ sender: Any) {
disconnectFromDevice()
print("Hello")
}
func disconnectFromDevice () {
// We have a connection to the device but we are not subscribed to the Transfer Characteristic for some reason.
// Therefore, we will just disconnect from the peripheral
centralManager?.cancelPeripheralConnection(blePeripheral!)
}
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.backBarButtonItem = UIBarButtonItem(title:"Back", style:.plain, target:nil, action:nil)
//Create and start the peripheral manager
peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
//-Notification for updating the text view with incoming text
}
override func viewDidAppear(_ animated: Bool) {
}
override func viewDidDisappear(_ animated: Bool) {
// peripheralManager?.stopAdvertising()
// self.peripheralManager = nil
super.viewDidDisappear(animated)
NotificationCenter.default.removeObserver(self)
}
@IBAction func clickSendAction(_ sender: AnyObject) {
outgoingData()
}
@IBAction func S(_ sender: Any) {
sends()
}
@IBAction func sendd(_ sender: Any) {
sendd()
}
@IBAction func senda(_ sender: Any) {
senda()
}
@IBAction func sendt(_ sender: Any) {
sendt()
}
@IBAction func sendb(_ sender: Any) {
sendb()
}
func outgoingData () {
let inputText = "W"
writeValue(data: inputText)
}
func sends () {
let inputText = "S"
writeValue(data: inputText)
}
func sendd () {
let inputText = "D"
writeValue(data: inputText)
}
func senda () {
let inputText = "A"
writeValue(data: inputText)
}
func sendt () {
let inputText = "T"
writeValue(data: inputText)
}
func sendb () {
let inputText = "B"
writeValue(data: inputText)
}
// Write functions
func writeValue(data: String){
let valueString = (data as NSString).data(using: String.Encoding.utf8.rawValue)
//change the "data" to valueString
if let blePeripheral = blePeripheral{
if let txCharacteristic = txCharacteristic {
blePeripheral.writeValue(valueString!, for: txCharacteristic, type: CBCharacteristicWriteType.withoutResponse)
}
}
}
func writeCharacteristic(val: Int8){
var val = val
let ns = NSData(bytes: &val, length: MemoryLayout<Int8>.size)
blePeripheral!.writeValue(ns as Data, for: txCharacteristic!, type: CBCharacteristicWriteType.withResponse)
}
//MARK: UITextViewDelegate methods
func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
if textView === baseTextView {
//tapping on consoleview dismisses keyboard
inputTextField.resignFirstResponder()
return false
}
return true
}
func textFieldDidBeginEditing(_ textField: UITextField) {
scrollView.setContentOffset(CGPoint(x:0, y:250), animated: true)
}
func textFieldDidEndEditing(_ textField: UITextField) {
scrollView.setContentOffset(CGPoint(x:0, y:0), animated: true)
}
func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
if peripheral.state == .poweredOn {
return
}
print("Peripheral manager is running")
}
//Check when someone subscribe to our characteristic, start sending the data
func peripheralManager(_ peripheral: CBPeripheralManager, central: CBCentral, didSubscribeTo characteristic: CBCharacteristic) {
print("Device subscribe to characteristic")
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.view.endEditing(true)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
outgoingData()
return(true)
}
func peripheralManagerDidStartAdvertising(_ peripheral: CBPeripheralManager, error: Error?) {
if let error = error {
print("\(error)")
return
}
}
}
从第二个视图控制器进行搜索时，如何终止所有连接？
非常感谢你们
答案 0 :(得分：0)
您可以在
中调用断开连接功能 override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!)