Swift蓝牙开发

github demo链接

新项目中要用蓝牙开发,把漆面仪测量到的数据通过蓝牙传给app,一般需要设备提供方提供开发用的UUID参数,但是对方也不知道参数,最后发现用如果你不知道外设UUID 用 lightBlue 这个app查看.

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蓝牙项目用一个服务UUID连接设备,用特征UUID接受外设传来的数据,初始化中心设备后等状态成poweredOn后再扫描,否则不执行代理方法.

蓝牙开发流程

• 定义 中心设备(CBCentralManager) 外设(CBPeripheral)
• 中心设备设置代理
• centralManagerDidUpdateState 这个方法里面扫描设备
• 扫码到设备后选出指定UUID或者名字的外设,然后连接特征.
• 连接到特征后外设设置接受通知
• 接受数据(Data类型)

import UIKit
import CoreBluetooth
//服务
let service1 = "00A9B803-EF34-4311-8EFE-F3D25901878E"
//读
let service3 = "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
class ViewController: UIViewController,CBCentralManagerDelegate,CBPeripheralDelegate {
//中心设备
lazy var magager: CBCentralManager = CBCentralManager()
//外设列表
var connectPeripheral : CBPeripheral?

override func viewDidLoad() {
    super.viewDidLoad()
    magager.delegate = self
}

func centralManagerDidUpdateState(_ central: CBCentralManager) {
    
    if (central.state == .poweredOn){
        print("打开蓝牙了")
        //必须状态ok后才可以扫描 要不不执行代理方法
        magager.scanForPeripherals(withServices: nil, options: nil)
    }
}

//外设更新名字
func peripheralDidUpdateName(_ peripheral: CBPeripheral) {
    
}

//扫码到设备后回调方法
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber)
{
    print("发现外设")
    print("名字 \(peripheral.name)")
    print("Rssi: \(RSSI)")
    print("外设UUID-->",peripheral.identifier.uuidString,"service-->",peripheral.services)
    
    if  (peripheral.name?.contains("QNix"))! != false
    {
        self.magager.stopScan()
        connectPeripheral = peripheral
        self.magager.connect(peripheral, options: nil)
    }

}

//外设链接成功
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
    connectPeripheral?.delegate = self
    
    var array : [CBUUID]?
    let uuid3 = CBUUID(string: service3)
    let uuid4 = CBUUID(string: service4)
    array?.append(uuid3)
    array?.append(uuid4)
    //发现设备服务
    connectPeripheral?.discoverServices(array)
}

//连接外设失败
func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
    print("连接外设失败")
}

//发现服务
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    
    print("发现服务UUID-->",peripheral.identifier.uuidString)

    //连接服务
    for service in peripheral.services! {
        connectPeripheral?.discoverCharacteristics(nil, for: service)
    }
}

//发现特征
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    //弹框
    
    for characteristic in service.characteristics! {
        print("发现特征UUID---> ",String(describing:characteristic.uuid))
        //接受通知
        if characteristic.uuid.uuidString ==  service4 {
            self.connectPeripheral?.setNotifyValue(true, for: characteristic)
        }
    }
    
}

//接受数据
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    
    let backToString = String(data: characteristic.value!, encoding: String.Encoding.utf8) as String!
    print("backToString",backToString ?? "",characteristic.uuid)
}