iOS开发之BLE(二)——外设连接与断开

class ViewController: UIViewController {
    
    // 中心管理者
    var centralManager :CBCentralManager!
    // 外设
    var peripheral: CBPeripheral?
    // 外设数组
    var peripherals: [CBPeripheral]!
    // 表格展示所有可连接设备
    var tabView : UITableView!
    
    // 断开链接
    @IBAction func disConnect(_ sender: Any) {
        
        self.centralManager.cancelPeripheralConnection(self.peripheral!)
        
        self.title = "已断开" + (self.peripheral!.name)!
        
        self.peripheral = nil
    }
    
    override func viewDidLoad() {
        
        super.viewDidLoad()
        
        self.peripherals = []
        
        tabView = UITableView(frame: self.view.frame)
        
        tabView.dataSource = self
        
        tabView.delegate = self
        
        self.view.addSubview(self.tabView)
        
        // 初始化中心管理者
        self.centralManager = CBCentralManager(delegate: self, queue: DispatchQueue.main, options: nil)
    }
}

// MARK:- UITableViewDataSource, UITableViewDelegate
extension ViewController: UITableViewDataSource, UITableViewDelegate {  
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
       
        return  self.peripherals.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        var cell = tableView.dequeueReusableCell(withIdentifier: "ble")
        
        if cell == nil {
            
            cell = UITableViewCell(style: .default, reuseIdentifier: "ble")
            
        }
        
        // 展示所有可连接的设备
        cell?.textLabel?.text = self.peripherals[indexPath.row].name
        
        return cell!
        
        
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        
        tableView.deselectRow(at: indexPath, animated: true)
        
        self.title =  "已连上" + (self.peripherals[indexPath.row].name)!
        
        // 连接想要的外设
        let selPeripheral = self.peripherals[indexPath.row]
        
        self.peripheral = selPeripheral

        //调用connect就会回调代理中连接外设结果的方法        
        self.centralManager.connect(self.peripheral!, options: nil)
    }
    
}


// MARK:- CBCentralManagerDelegate
extension ViewController: CBCentralManagerDelegate {

    // 监听CBCentralManager的状态
    func centralManagerDidUpdateState(_ central: CBCentralManager){
        
        // 蓝牙打开的时候进行扫描
        if central.state == .poweredOn {
            // 传入nil，扫描所有可以发现的设备
            central.scanForPeripherals(withServices: nil, options: nil)
        }
        
    }
     
     // 扫描发现外设就会回调该方法
    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        
        if !self.peripherals.contains(peripheral) {
            
            self.peripherals?.append(peripheral)
            // 刷新表格
            self.tabView.reloadData()
        }
    }
        
    // 连接外设的结果
    // 1 连接成功
    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {        
        print("didConnectPeripheral")
    }
    
    // 2 连接失败
    func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
        print("didFailToConnectPeripheral")
    }
    
    // 3 丢失连接
    func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
        print("didDisconnectPeripheral")
    }    
}