swift - CoreBluetooth 只能在连接状态下接受命令

Question

[CoreBluetooth] API MISUSE: <CBPeripheral: 0x281310820, identifier = 75450BB1-97A7-5648-38FD-B27572F19EDD, name = ESP32 test, state = disconnected> can only accept commands while in the connected state

这是 CoreBluetooth 在我尝试时给我的错误

peripheral.discoverServices([CBUUID(string: "4fafc201-1fb5-459e-8fcc-c5c9c331914b")])

有人知道发生了什么事吗？

这是 didDiscover 委托(delegate):

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    var peripheralName: String!
    if let name = advertisementData[CBAdvertisementDataLocalNameKey] as? String {
        peripheralName = name
    }
    else {
        peripheralName = "Unknown"
    }
    
    if(advertisementData[CBAdvertisementDataServiceUUIDsKey] != nil) {
        //print(advertisementData)
        let Ids: [CBUUID] = advertisementData[CBAdvertisementDataServiceUUIDsKey] as! [CBUUID]
        if(Ids.count == 1) {
            print(Ids[0])
            let newPeripheral = Peripheral(id: peripherals.count, name: peripheralName, rssi: RSSI.intValue)
            //print(newPeripheral)
            /*
            if let services = peripheral.services {
                for service in services {
                    print("servizio")
                    //peripheral.discoverCharacteristics([CBUUID(string: "4fafc201-1fb5-459e-8fcc-c5c9c331914b")], for: service)
                }
            }*/
            if(accepted_services.contains(Ids[0].uuidString)) {
                print(newPeripheral)
                peripherals.append(newPeripheral)
                peripheral.delegate = self
                peripheral.discoverServices([CBUUID(string: "4fafc201-1fb5-459e-8fcc-c5c9c331914b")])
                //peripheral.discoverCharacteristics([CBUUID(string: "beb5483e-36e1-4688-b7f5-ea07361b26a8")], for: <#CBService#>)
            }
        }
    }
}

编辑:我现在尝试先连接到外围设备，但出现另一个错误:

[CoreBluetooth] API MISUSE: Cancelling connection for unused peripheral <CBPeripheral: 0x2829e01e0, identifier = 75450BB1-97A7-5648-38FD-B27572F19EDD, name = ESP32 test, state = connecting>, Did you forget to keep a reference to it?

这是实际的代码:

    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String:Any], rssi RSSI: NSNumber) {
    print("scoperto peripheral")
    myCentral.connect(peripheral, options: nil)
}

这是什么意思？

Answer 1

您负责在某处保存对 CBPeripheral 的引用。这就是消息告诉您的内容(“您是否忘记保留对它的引用？”)您正在创建一个 Peripheral(我假设它是一个自定义结构或类)，但它只有名称，而不是 CBPeripheral。这意味着在 didDiscover 结束时，CBPeripheral 没有被任何东西引用并且它被释放了。