对于BLE来说是全新的，并且通常对移动应用程序进行编码。我已经尝试了几个演示，并遇到了这个https://github.com/RickRedSix/BLE4.0-iOS-Swift-Demo 问题是它没有连接到我的BLE设备，因此我假设它仅扫描当时的BLE设备创建者，因此我总是收到错误“仅在通电状态下才能接受此命令”。我需要更改代码中的任何部分以使其扫描另一个外围设备吗？我需要在某处指定设备的UUID，MAC地址或其他唯一信息吗？
感谢有关此问题的任何帮助
答案 0 :(得分：1)
大约一年前，我曾开发过一个应用程序，用于扫描并连接到BLE设备。从该项目发布代码。如果您完全按原样粘贴，则可能无法正常工作。但是我100％确信这正是您想要实现的目标。
我也使用“ https://github.com/RickRedSix/BLE4.0-iOS-Swift-Demo”作为参考。
希望这可以帮助您解决问题。如果您有任何疑问，请告诉我。
import UIKit
import CoreLocation
import CoreBluetooth
class BLEDeviceTableViewController: UIViewController, CLLocationManagerDelegate, UITableViewDelegate, UITableViewDataSource, CBCentralManagerDelegate, CBPeripheralDelegate {
private var myTableView: UITableView!
var manager : CBCentralManager!
var myBluetoothPeripheral = [CBPeripheral]()
var myCharacteristic : CBCharacteristic!
var isMyPeripheralConected = false
var peripheralNames = [String]()
override func viewDidLoad() {
super.viewDidLoad()
let displayWidth: CGFloat = self.view.frame.width
manager = CBCentralManager(delegate: self, queue: nil)
myTableView = UITableView(frame: CGRect(x: 0, y: 135, width: displayWidth, height: (self.view.frame.height-(self.view.frame.height/3))-10))
myTableView.register(UITableViewCell.self, forCellReuseIdentifier: "MyCell")
myTableView.dataSource = self
myTableView.delegate = self
self.view.addSubview(myTableView)
// Do any additional setup after loading the view.
}
func centralManagerDidUpdateState(_ central: CBCentralManager) {
var msg = ""
switch central.state {
case .poweredOff:
msg = "Bluetooth is Off"
case .poweredOn:
msg = "Bluetooth is On"
manager.scanForPeripherals(withServices: nil, options: nil)
case .unsupported:
msg = "Not Supported"
default:
msg = ""
}
print("STATE: " + msg)
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
peripheralNames.append(peripheral.name ?? "Unknown Device")
print(peripheral)
self.myBluetoothPeripheral.append(peripheral) //save peripheral
print(peripheralNames)
myTableView.reloadData()
}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print("Connected to \(peripheral.name ?? "Uknown Device")")
availableDeviceLabel.text = "Connected to \(peripheral.name ?? "Uknown Device")"
isMyPeripheralConected = true //when connected change to true
peripheral.delegate = self
peripheral.discoverServices(nil)
}
func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
isMyPeripheralConected = false //and to falso when disconnected
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
print("Services:\(String(describing: peripheral.services)) and error\(String(describing: error))")
if let services = peripheral.services {
for service in services {
peripheral.discoverCharacteristics(nil, for: service)
}
}
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
print("peripheral:\(peripheral) and service:\(service)")
for characteristic in service.characteristics!
{
peripheral.setNotifyValue(true, for: characteristic)
}
}
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
let readValue = characteristic.value
print("Response from BLE Device: \(readValue)")
}
//if you want to send an string you can use this function.
func writeValue() {
if isMyPeripheralConected {
//check if myPeripheral is connected to send data
//let dataToSend: Data = "Hello World!".data(using: String.Encoding.utf8)!
//myBluetoothPeripheral.writeValue(dataToSend, for: myCharacteristic, type: CBCharacteristicWriteType.withoutResponse) //Writing the data to the peripheral
} else {
print("Not connected")
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//let indexPath = NSIndexPath(forRow: tag, inSection: 0)
//let cell = tableView.cellForRow(at: indexPath) as! gpsSettingsCustomCell!
//print(cell?.cellLabel.text ?? "")
self.myBluetoothPeripheral[indexPath.row].delegate = self
manager.stopScan() //stop scanning for peripherals
manager.connect(myBluetoothPeripheral[indexPath.row], options: nil)
myTableView.deselectRow(at: indexPath, animated: true)
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return peripheralNames.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = gpsSettingsCustomCell(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: 60), title: "Hello")
cell.cellLabel.text = peripheralNames[indexPath.row]
cell.cellLabel2.text = "Bluetooth Device"
return cell
}
class BLEDeviceCustomCell: UITableViewCell {
//var cellButton: UIButton!
var cellLabel: UILabel!
var cellLabel2: UILabel!
init(frame: CGRect, title: String) {
super.init(style: .default, reuseIdentifier: "cell")
//super.init(style: UITableViewCellStyle.Default, reuseIdentifier: "cell")
cellLabel = UILabel(frame: CGRect(x: 10, y: 10, width: self.frame.width, height: 20))
cellLabel.font = UIFont(name: "Titillium-Regular", size: 14.0)
//cellLabel= UILabel(frame: CGRectMake(self.frame.width - 100, 10, 100.0, 40))
cellLabel.textColor = UIColor.black
//cellLabel.font = //set font here
cellLabel2 = UILabel(frame: CGRect(x: 10, y: 30, width: self.frame.width, height: 20))
cellLabel2.font = UIFont(name: "Titillium-Regular", size: 14.0)
cellLabel2.textColor = UIColor.gray
//cellButton = UIButton(frame: CGRectMake(5, 5, 50, 30))
//cellButton.setTitle(title, forState: UIControlState.Normal)
addSubview(cellLabel)
addSubview(cellLabel2)
//addSubview(cellButton)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
}
答案 1 :(得分：0)
该消息表示您应该打开蓝牙电源，然后搜索设备。像这样：
func centralManagerDidUpdateState(_ central: CBCentralManager) {
switch central.state {
case .unknown:
print("Unknown")
case .resetting:
print("Resetting")
case .unsupported:
print("Unsupported")
case .unauthorized:
print("Unauthorized")
case .poweredOff:
print("Powered Off")
central.stopScan()
case .poweredOn:
print("Powered On")
central.scanForPeripherals(withServices: nil, options: nil)
}
}