iOS藍牙不發現設備

Question

我正在嘗試創建一個應用程序，它將掃描外圍BLE設備。我使用的是BLE Mini，我可以在LightBlue和RedBear iPhone應用程序中看到它。我已經確認掃描在BLE開機時開始，但是當我運行我的程序時，沒有發現BLE設備。我已經瀏覽了很多在iOS中實現Corebluetooth的例子，看起來我擁有所有必需的功能。我哪裏錯了？感謝您的幫助。

// BlueToothVC.swift 
import UIKit 
import CoreBluetooth 
class BlueToothVC: UIViewController, UITableViewDataSource, UITableViewDelegate, CBCentralManagerDelegate 
{ 
    @IBOutlet weak var tableView: UITableView! 
    var centralManager: CBCentralManager! 
    var peripherals: Array<CBPeripheral> = Array<CBPeripheral>() 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     tableView.delegate = self 
     tableView.dataSource = self 
     centralManager = CBCentralManager(delegate: self, queue: DispatchQueue.main) 


     // Uncomment the following line to preserve selection between presentations 
     // self.clearsSelectionOnViewWillAppear = false 

     // Uncomment the following line to display an Edit button in the navigation bar for this view controller. 
     // self.navigationItem.rightBarButtonItem = self.editButtonItem() 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    //CoreBluetooth methods 
    func centralManagerDidUpdateState(_ central: CBCentralManager) 
    { 
     if (central.state == CBManagerState.poweredOn) 
     { 
      print("scanning") 
      self.centralManager?.scanForPeripherals(withServices: nil, options: nil) 
     } 
     else 
     { 
      // do something like alert the user that ble is not on 
     } 
    } 

    private func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) 
    { 
     peripherals.append(peripheral) 
     tableView.reloadData() 
     print("saw something") 
    } 

    func numberOfSections(in tableView: UITableView) -> Int { 
     return 1 
    } 
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return peripherals.count 
    } 


    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
     let cell = self.tableView.dequeueReusableCell(withIdentifier: "BTCell")! as! BTCell 
     let peripheral = peripherals[indexPath.row] 
     cell.label.text = peripheral.name 
     return cell 
    } 

    @IBAction func touchCancel(_ sender: AnyObject) { 
     self.navigationController?.popViewController(animated: true) 
    } 
} 

Answer 1

您的didDiscoverPeripheral委託方法不正確。

我注意到你已經使它private;大概這是因爲Xcode給了你一個錯誤，認爲函數「幾乎與另一個方法的簽名相匹配」，並建議將它設爲私有。這樣做從外部類隱藏此方法並刪除了該錯誤，但這意味着您沒有實現委託方法didDiscoverPeripheral。

您需要在函數簽名_central:

private func centralManager(_ central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) 
{ 
    peripherals.append(peripheral) 
    tableView.reloadData() 
    print("saw something") 
}