我有一个SWIFT应用程序必须通过Bluetooth LowEnergy模块向我的Arduino发送一个值！
我已正确完成搜索和连接部分，但我无法发送和接收任何数据。
这是我的代码，用于获取可用的BLE设备列表，并将所有这些设置放在表格视图中，然后单击应用程序提供的单元格以将设备与它们连接！
这一切都很完美但我不知道发送例如＆＃34; a＆＃34;从应用程序到BLE的角色，从arduino回到应用程序的答案！
import UIKit
import CoreBluetooth
class BluetoothList: UITableViewController,CBCentralManagerDelegate, CBPeripheralDelegate {
var listValue = [Lista]()
var Blue: CBCentralManager!
var conn: CBPeripheral!
var a: String!
var char: CBCharacteristic!
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
if (peripheral.name == a){
self.conn = peripheral
self.conn.delegate = self
Blue.stopScan()
Blue.connectPeripheral(self.conn, options: nil)
self.performSegueWithIdentifier("ConnectionSegue", sender: nil)
}
else{
listValue = [
Lista(Name: peripheral.name!, RSS: RSSI.stringValue)
]
self.tableView.reloadData()
}
}
func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
peripheral.delegate = self
peripheral.discoverServices(nil)
}
func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) {
if let servicePeripheral = peripheral.services! as [CBService]!{
for service in servicePeripheral{
peripheral.discoverCharacteristics(nil, forService: service)
}
}
}
func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {
if let characterArray = service.characteristics! as [CBCharacteristic]!{
for cc in characterArray {
if(cc.UUID.UUIDString == "FF05"){
print("OKOK")
peripheral.readValueForCharacteristic(cc)
}
}
}
}
func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) {
if (characteristic.UUID.UUIDString == "FF05"){
let value = UnsafePointer<Int>((characteristic.value?.bytes.memory)!)
print("\(value)")
}
}
func centralManagerDidUpdateState(central: CBCentralManager){
switch(central.state){
case .PoweredOn:
Blue.scanForPeripheralsWithServices(nil, options:nil)
print("Bluetooth is powered ON")
case .PoweredOff:
print("Bluetooth is powered OFF")
case .Resetting:
print("Bluetooth is resetting")
case .Unauthorized:
print("Bluetooth is unauthorized")
case .Unknown:
print("Bluetooth is unknown")
case .Unsupported:
print("Bluetooth is not supported")
}
}
override func viewDidLoad() {
super.viewDidLoad()
Blue = CBCentralManager(delegate: self, queue: nil)
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let currentCell = tableView.cellForRowAtIndexPath(tableView.indexPathForSelectedRow!)! as UITableViewCell
a = currentCell.textLabel?.text
Blue = CBCentralManager(delegate: self, queue: nil)
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
@IBAction func Reload_BTN(sender: AnyObject) {
self.tableView.reloadData()
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.listValue.count
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cella = self.tableView.dequeueReusableCellWithIdentifier("Cella", forIndexPath: indexPath)
let Lista = self.listValue[indexPath.row]
cella.textLabel?.text = Lista.Name
cella.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
return cella
}
答案 0 :(得分：6)
以下代码适用于Swift 3（XCode 8 Beta 6）。这是一个使用标准UUID用于串行端口的示例，例如某些商业模块上的串行端口。因此，服务和特征的声明应如下所示：
private let UuidSerialService = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
private let UuidTx = "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
private let UuidRx = "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
然后你的委托给didDiscoverCharacteristic的方法可以是这样的：
public func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?)
{
if let characteristics = service.characteristics {
for characteristic in characteristics {
// Tx:
if characteristic.uuid == CBUUID(string: UuidTx) {
print("Tx char found: \(characteristic.uuid)")
txCharacteristic = characteristic
}
// Rx:
if characteristic.uuid == CBUUID(string: UuidRx) {
rxCharacteristic = characteristic
if let rxCharacteristic = rxCharacteristic {
print("Rx char found: \(characteristic.uuid)")
serialPortPeripheral?.setNotifyValue(true, for: rxCharacteristic)
}
}
}
}
}
对于写入Tx，类似下面的工作，其中值是[UInt8]：
let data = NSData(bytes: value, length: value.count)
serialPortPeripheral?.writeValue(data as Data, for: txCharacteristic, type: CBCharacteristicWriteType.withResponse)
读？
public func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
let rxData = characteristic.value
if let rxData = rxData {
let numberOfBytes = rxData.count
var rxByteArray = [UInt8](repeating: 0, count: numberOfBytes)
(rxData as NSData).getBytes(&rxByteArray, length: numberOfBytes)
print(rxByteArray)
}
}
最后，如果您不知道或不确定BLE设备的服务和特性，您可以寻找一款名为“LightBlue”的免费iOS应用。它会发现一个设备，如果你连接它，它将列出所有服务和特征。请注意，当LightBlue连接到您的设备时，您的应用程序将无法访问BLE硬件。