Swift 3:无法通过BLE连接到外围设备 [英] Swift 3: Can't connect to peripheral via BLE

问题描述

我是使用BLE的新手，目前正在尝试制作一个简单的应用程序，该应用程序将连接到我的自定义BLE设备.我能够发现BLE设备，但是由于某种原因我无法连接到它. 我尝试使用浅蓝色"进行检查，它显示我的设备可连接，并且工作正常.但是，在我发现设备后，在我的应用程序中，CB管理器尝试连接到该设备，并且似乎冻结"了吗?永远不会触发功能"didConnect外设"，而外设的状态则永远是正在连接".

I'm new to working with BLE, currently trying to make a simple application which would connect to my custom BLE device. I am able to discover the BLE device, but for some reason i can't connect to it. I tried to check it with 'Light Blue', it shows my device as connectable and seems to work fine. But in my app after i discover the device, CB manager tries to connect to it and seems to 'freeze'? Function 'didConnect peripheral' is never triggered, and state of peripheral is forever 'connecting'.

我如何识别问题?我可以在连接方法中包含任何选项，或者以某种方式跟踪连接过程吗?

How can i identify the problem? Is there any options i can include in connection method, or somehow track the connection process?

对于在哪里寻找问题的任何建议，我将不胜感激.

I would appreciate any advice where to search for problems.

使用Swift 3在XCode 8.2.1中工作.测试电话上安装了iOS 10.2.1

Working in XCode 8.2.1, using Swift 3. iOS 10.2.1 installed on the testing phone

这是我的代码:

import UIKit
import CoreBluetooth

class InfoPageViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate {

var manager:CBCentralManager!
var peripheral:CBPeripheral!

let BEAN_NAME = "MyDevice"

override func viewDidLoad() {
    super.viewDidLoad()

    manager = CBCentralManager(delegate: self, queue: nil)
}

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {

    let device = (advertisementData as NSDictionary)
        .object(forKey: CBAdvertisementDataLocalNameKey)
        as? NSString

    if device?.contains(BEAN_NAME) == true {
        self.manager.stopScan()

        self.peripheral = peripheral
        self.peripheral.delegate = self

        manager.connect(peripheral, options: nil)

        print("discovered \(BEAN_NAME)")

    }
}

func centralManager(
    central: CBCentralManager,
    didConnect peripheral: CBPeripheral) {
    print("connected to \(BEAN_NAME)")

    peripheral.discoverServices(nil)
}

推荐答案

func centralManager(central: CBCentralManager, didConnect peripheral: CBPeripheral) {}
--------------------^

对:

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral)
--------------------^

该方法的签名不正确，您错过了_.

The signature of the method is not the correct one, you are missing the _.

方法签名很重要. 我们可以假设，因为这些委托方法是可选的，所以在内部，Apple代码会自问: 我的代表是否已实现方法func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral)(respondsToSelector:)?在您的情况下，不是，因为不一样，因此不会调用您的.

Method signatures are important. We can assume, since theses delegate methods are optional, that internally, the Apple code asks itself: Does my delegate have the method func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) implemented (respondsToSelector:)? In your case, not, because it's not the same, and then yours is not called.

您可以从文档中复制/粘贴该文档或将其删除，然后让XCode进行自动补全.

You copy/paste the one from the doc or remove it and let XCode do its autocompletion thing.

这篇关于Swift 3:无法通过BLE连接到外围设备的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！