iOS设置作为蓝牙外设

一、 说明

任意苹果设备都可以作为蓝牙外设进行设置。
苹果蓝牙后台的限制，原本广播会有两个段分别是localName和serviceUUID这两块，但现在后台广播时，是不发送在这两段的。

二、设置蓝牙外设

1. 初始化外设中心

let peripheralManager = CBPeripheralManager.init(delegate: self, queue: DispatchQueue.main)
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2. 创建外设服务

public func setupServiceAndCharacteristics() {
        // 创建服务
        let serviceID = CBUUID(string: kServiceUUID)
        let service = CBMutableService(type: serviceID, primary: true)
        // 创建服务中的特征
        let characteristicID = CBUUID(string: kChARACTERISTICUUID)
        let characteristic = CBMutableCharacteristic(type: characteristicID, properties: [.read, .write, .notify], value: nil, permissions: [.readable, .writeable])
        // 特征添加进服务
        service.characteristics = [characteristic]
        // 服务加入管理
        self.peripheralManager?.add(service)
    }
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3. 获取外设蓝牙状态

let tempState = self.peripheralManager?.state ?? .unknown
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4. 发送蓝牙数据

let sendSuccess: Bool = self.peripheralManager.updateValue(self.textField.text.data(using: NSUTF8StringEncoding), forCharacteristic: self.characteristic, onSubscribedCentrals: nil)
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三、外设代理

CBPeripheralManagerDelegate

1. 状态变更回调

    func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
        print(peripheral.state)
        delegate?.peripheralUpdateState(peripheral)
    }
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2. 中心设备读取数据的时候回调

    func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveRead request: CBATTRequest) {
        // 请求中的数据，这里把文本框中的数据发给中心设备
//        request.value = self.textField.text.data(using: NSUTF8StringEncoding)
        // 成功响应请求
//        peripheral.respondToRequest(request, withResult: CBATTErrorSuccess)
    }
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3. 中心设备写入数据的时候回调

    func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveWrite requests: [CBATTRequest]) {
        // 写入数据的请求
        let request = requests.last
        
        let data = request?.value
        delegate?.peripheralDidReceiveWrite(data)
    }
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4. 订阅提示

    func peripheralManager(_ peripheral: CBPeripheralManager, central: CBCentral, didSubscribeTo characteristic: CBCharacteristic) {
        print(#function)
    }
    
    // 取消订阅回调
    func peripheralManager(_ peripheral: CBPeripheralManager, central: CBCentral, didUnsubscribeFrom characteristic: CBCharacteristic) {
        print(#function)
    }
}
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四、发送广播数据

1. 发送不同广播

self.peripheralManager?.startAdvertising(periData)
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2. beacon广播

注意⚠️：测试时beacon广播CLBeacon未检测到iPhone设备。 即使使用 Turning an iOS device into an iBeacon device 也没有结果(如果帮助不胜感激)

/// 开始发送广播
    public func startBroadcasting(major: UInt16 = 0, minor: UInt16 = 0, peripheralData: [String: Any]? = nil) {
        // 为beacon基站创建一个唯一标示
        guard let myUUID = UUID(uuidString: kBeaconUUIDString) else {
            return
        }
        
        let constraint = CLBeaconIdentityConstraint(uuid: myUUID, major: major, minor: minor)
        let myBeaconRegion = CLBeaconRegion.init(beaconIdentityConstraint: constraint, identifier: kBeaconidentifier)
        
        // 获取该Beacon区域的信号信息
        var periData = myBeaconRegion.peripheralData(withMeasuredPower: nil) as? [String: Any]
        peripheralData?.forEach { (key: String, value: Any) in
            periData?[key] = value
        }
        // 创建并广播Beacon信号
        self.peripheralManager?.startAdvertising(periData)
    }
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3. 停止广播

self.peripheralManager?.stopAdvertising()
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