【发布时间】：2017-04-17 20:27:33
【问题描述】：
所以我写了一个（相当）简单的代码来扫描蓝牙设备，并连接到一个具有匹配名称的设备，但是当找到一个 BT 设备时应该调用的函数永远不会被调用。有人可以看看这个，看看你是否能在我的工作中发现一个错误？
我尝试过的事情：
- 将扫描初始化中的服务 uuid 更改为 nil 以扫描所有设备
- 使用 NSLog 语句检测 didDiscover 程序何时发现设备
- 在每个函数开始时要中断的一堆断点。
我对此感到非常困惑，我关注了一个名为 The 12 Steps of Bluetooth 的页面，并仔细检查了苹果开发者参考页面。
import UIKit
import CoreBluetooth
class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate {
var manager:CBCentralManager!
var peripheral:CBPeripheral!
var peripherals = Array<CBPeripheral>()
let devName = "CHS Bus Loop"
let servUUID = CBUUID(string: "6e400001-b5a3-f393-e0a9-e50e24dcca9e")
let txChar = CBUUID(string: "6E400002-B5A3-F393-E0A9-E50E24DCCA9E")
let rxChar = CBUUID(string: "6E400003-B5A3-F393-E0A9-E50E24DCCA9E")
var txCharacteristic: CBCharacteristic?
override func viewDidLoad() {
super.viewDidLoad()
manager = CBCentralManager(delegate: self, queue: nil)
textLabel.text="CHS We Are One"
// Do any additional setup after loading the view, typically from a nib.
}
func centralManagerDidUpdateState(_ central: CBCentralManager) {
if central.state == CBManagerState.poweredOn {
central.scanForPeripherals(withServices: nil, options: nil)
} else {
print("Bluetooth not available.")
}
}
func centralManager(central: CBCentralManager, didDiscoverperipheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
let device = (advertisementData as NSDictionary)
.object(forKey: CBAdvertisementDataLocalNameKey)
as? NSString
if device?.contains(devName) == true{
self.manager.stopScan()
self.peripheral = peripheral
self.peripheral.delegate = self
manager.connect(peripheral, options: nil)
}
func centralManager2(central: CBCentralManager, didConnectperipheral peripheral: CBPeripheral){
peripheral.discoverServices(nil)
}
func peripheral(peripheral: CBPeripheral,didDiscoverServices error: NSError?){
for service in peripheral.services! {
let thisService = service as CBService
if service.uuid == txChar{
peripheral.discoverCharacteristics(nil, for:thisService)
}
}
}
func peripheral(
peripheral: CBPeripheral,
didDiscoverCharacteristicsForService service: CBService,
error: NSError?) {
for characteristic in service.characteristics! {
let thisCharacteristic = characteristic as CBCharacteristic
if thisCharacteristic.uuid == rxChar {
self.peripheral.setNotifyValue(
true,
for: thisCharacteristic
)
}
}
}
peripherals.append(peripheral)
//tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var deviceSelector: UITableView!
@IBOutlet weak var textField1: UITextField!
@IBOutlet weak var textField2: UITextField!
@IBOutlet weak var textField3: UITextField!
@IBOutlet weak var textField4: UITextField!
@IBOutlet weak var textField5: UITextField!
@IBOutlet weak var textField6: UITextField!
@IBOutlet weak var direct1: UISegmentedControl!
@IBOutlet weak var direct2: UISegmentedControl!
@IBOutlet weak var direct3: UISegmentedControl!
@IBOutlet weak var direct4: UISegmentedControl!
@IBOutlet weak var direct5: UISegmentedControl!
@IBOutlet weak var direct6: UISegmentedControl!
@IBOutlet weak var textLabel: UILabel!
@IBAction func UpdateDecimal(_ sender: Any) {
var LED1=""
var LED2=""
var LED3=""
var LED4=""
var LED5=""
var LED6=""
var combine=""
if direct1.selectedSegmentIndex == 2{
LED1 = "002"
}else{
LED1 = self.textField1.text! + "\(direct1.selectedSegmentIndex)"
}
if direct2.selectedSegmentIndex == 2{
LED2 = "002"
}else{
LED2 = self.textField2.text! + "\(direct2.selectedSegmentIndex)"
}
if direct3.selectedSegmentIndex == 2{
LED3 = "002"
}else{
LED3 = self.textField3.text! + "\(direct3.selectedSegmentIndex)"
}
if direct4.selectedSegmentIndex == 2{
LED4 = "002"
}else{
LED4 = self.textField4.text! + "\(direct4.selectedSegmentIndex)"
}
if direct5.selectedSegmentIndex == 2{
LED5 = "002"
}else{
LED5 = self.textField5.text! + "\(direct5.selectedSegmentIndex)"
}
if direct6.selectedSegmentIndex == 2{
LED6 = "002"
}else{
LED6 = self.textField6.text! + "\(direct6.selectedSegmentIndex)"
}
if LED1.characters.count == 2{
LED1="0" + LED1
}
if LED2.characters.count == 2{
LED2="0" + LED2
}
if LED3.characters.count == 2 {
LED3="0" + LED3
}
if LED4.characters.count == 2{
LED4="0" + LED4
}
if LED5.characters.count == 2{
LED5="0" + LED5
}
if LED6.characters.count == 2{
LED6="0" + LED6
}
if LED1.characters.count + LED2.characters.count + LED3.characters.count + LED4.characters.count + LED5.characters.count + LED6.characters.count != 18{
textLabel.text = "All MUST have 2 digits"
}else{
combine = LED1 + LED2 + LED3 + LED4 + LED5 + LED6
textLabel.text = combine
}
let data = combine.data(using: String.Encoding.utf8)
peripheral.writeValue(data!, for: txCharacteristic!,
type:CBCharacteristicWriteType.withoutResponse);
}
}
【问题讨论】：
-
我没有看到你在初始化管理器后调用 scanForPeripherals。如果 centralManagerDidUpdateState(_:) 没有运行，您将永远不会扫描外围设备。
-
@Dare 第 24 行。它在 func centralManagerDidUpdateState 中，它检查状态是否已通电，如果是，则开始扫描。
-
所以你从来没有接到过
didDiscoverPeripheral的电话？您是否尝试过 LightBlue 应用程序以查看它是否可以看到您的外围设备？检查外设名称的广告数据可能不起作用，具体取决于您的外设和广告的内容。 -
正如 Paulw11 所说，检查您是否可以使用 LightBlue 看到您的设备，它是否真的是 BLE 设备并且可以找到（如果它做广告）。但我猜你的问题在于混合 Swift 3 和旧的 Swift 方法。检查那里 (stackoverflow.com/questions/40491818/…) 以获得适合您需求的答案。
-
替换：
func centralManager(central: CBCentralManager, didDiscoverperipheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber)=>func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber)。再次阅读我的链接答案。检查委托方法的所有真实声明，尤其是没有“_”的委托方法。而且你不能拥有像你这样的centralManager2()...，它也不行。
标签： ios swift bluetooth core-bluetooth