ios - 单击按钮时将数据写入特征 - Swift

Question

我已经成功地将一个 ios 应用程序连接到我的 BLE hm-10 设备，并向它发送一个字符串特征。但是，我不知道如何在使用@IBAction 函数按下按钮后发送字符串。

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error:NSError?)
{
    print("Found \(service.characteristics!.count) characteristics!: \(service.characteristics)")
    _peripheral = peripheral
    _characteristics = service.characteristics
    let string = "off"

    let data = string.dataUsingEncoding(NSUTF8StringEncoding)


    for characteristic in service.characteristics as [CBCharacteristic]!
    {

        if(characteristic.UUID.UUIDString == "FFE1")
        {
            print("sending data")
            peripheral.writeValue(data!, forCharacteristic: characteristic,type: CBCharacteristicWriteType.WithoutResponse)
        }
    }

}

@IBAction func onButtonTouch(sender: UIButton)
{
    let string = "on"

    let data = string.dataUsingEncoding(NSUTF8StringEncoding)

    _peripheral.writeValue(data!, forCharacteristic: _characteristics, type: CBCharacteristicWriteType.WithoutResponse)

}

当我将这段代码放入底部显示的@IBAction 函数时，它不起作用，因为“特征”是一个未解析的标识符。有没有办法将其链接到外围功能？我对使用 Swift 进行编码比较陌生，因此非常感谢任何帮助。谢谢。

Answer 1

class viewController: UIViewController {

    var _peripheral: CBPeripheral?
    var _characteristics: [CBCharacteristic]?

    func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error:NSError?)
    {
    print("Found \(service.characteristics!.count) characteristics!: \(service.characteristics)")
    _peripheral = peripheral
    _characteristics = service.characteristics
    let string = "off"

    let data = string.dataUsingEncoding(NSUTF8StringEncoding)


       for characteristic in service.characteristics as [CBCharacteristic]!
        {

            if(characteristic.UUID.UUIDString == "FFE1")
            {
                print("sending data")
                peripheral.writeValue(data!, forCharacteristic: characteristic,type: CBCharacteristicWriteType.WithoutResponse)
            }
        }

    }

    @IBAction func onButtonTouch(sender: UIButton)
    {
    let string = "on"

    let data = string.dataUsingEncoding(NSUTF8StringEncoding)

    let characteristic = //get right on out of _characteristics! array
    _peripheral!.writeValue(data!, forCharacteristic: characteristic, type: CBCharacteristicWriteType.WithoutResponse)

    }
}