外围没有连接 – 斯威夫特

发布时间：2020-12-14 04:35:36 所属栏目：百科来源：网络整理

导读：在我的 Swift应用程序中,我有一个应该找到蓝牙设备并连接到它的视图.蓝牙设备已开机.我能够扫描并找到该设备,然后我调用该功能连接到它,但我得不到任何反馈.我不确定为什么它无法连接. didFailToConnectPeripheral或didConnectPeripheral都没有返回任何值.

在我的 Swift应用程序中,我有一个应该找到蓝牙设备并连接到它的视图.蓝牙设备已开机.我能够扫描并找到该设备,然后我调用该功能连接到它,但我得不到任何反馈.我不确定为什么它无法连接.

didFailToConnectPeripheral或didConnectPeripheral都没有返回任何值.

我如何让它工作？

import UIKit
import CoreBluetooth

class ViewController: UIViewController,CBCentralManagerDelegate,CBPeripheralDelegate {

    var manager: CBCentralManager!


    override func viewDidLoad() {
        super.viewDidLoad()
        manager = CBCentralManager (delegate: self,queue: nil)
    }


    func centralManager(central: CBCentralManager,didDiscoverPeripheral peripheral: CBPeripheral,advertisementData: [String : AnyObject],RSSI: NSNumber) {

        print("Peripheral: (peripheral)")

        manager.connectPeripheral(peripheral,options:nil)

        manager.stopScan()

    }



    func centralManager(central: CBCentralManager,didConnectPeripheral peripheral: CBPeripheral) {
        print("connected!")
    }

    func centralManager(central: CBCentralManager,didDisconnectPeripheral
        peripheral: CBPeripheral,error: NSError?) {
            print("disconnected!")
    }


    func centralManager(central: CBCentralManager,didFailToConnectPeripheral peripheral: CBPeripheral,error: NSError?) {
            print("failed")
    }


    func centralManagerDidUpdateState(central: CBCentralManager) {
        print("Checking")
        switch(central.state)
        {
        case.Unsupported:
            print("BLE is not supported")
        case.Unauthorized:
            print("BLE is unauthorized")
        case.Unknown:
            print("BLE is Unknown")
        case.Resetting:
            print("BLE is Resetting")
        case.PoweredOff:
            print("BLE service is powered off")
        case.PoweredOn:
            print("BLE service is powered on")
            print("Start Scanning")
            manager.scanForPeripheralsWithServices(nil,options: nil)
        default:
            print("default state")
        }
    }
}

解决方法

您需要保留您尝试连接的CBPeripheral对象,否则一旦委托方法didDiscoverPeripheral返回它就会被释放.

import UIKit
import CoreBluetooth

class ViewController: UIViewController,CBPeripheralDelegate {

    var manager: CBCentralManager!
    var connectingPeripheral: CBPeripheral?


    override func viewDidLoad() {
        super.viewDidLoad()
        manager = CBCentralManager (delegate: self,RSSI: NSNumber) {

        print("Peripheral: (peripheral)")

        self.connectingPeripheral=peripheral    

        manager.connectPeripheral(peripheral,options:nil)

        manager.stopScan()
    }

...

}

（编辑：李大同）

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