由于没有使用 OBD2Kit 和 Swift 的示例代码，我将其 fork 到 https://github.com/YannisDC/OBD2Kit 中并将其用作 pod。

我翻译了一些 OBJ-C 示例代码，但似乎无法将 FLWiFiScanTool 向下转换为 ELM327 类型。为什么我总是得到零？

import UIKit
import OBD2Kit

class ViewController: UIViewController, FLScanToolDelegate {

    @IBOutlet weak var hostIpAddress: UITextField!

    var scanTool: ELM327!

    @IBOutlet weak var statusLabel: UILabel!
    @IBOutlet weak var scanToolLabel: UILabel!
    @IBOutlet weak var rpmLabel: UILabel!
    @IBOutlet weak var speedLabel: UILabel!
    @IBOutlet weak var tempLabel: UILabel!
    var scanning = false

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.hostIpAddress.text = "192.168.0.10"
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func scanButton(sender: UIButton) {
        if !scanning {
            startScan()
        } else {
            stopScan()
        }
    }

    func startScan() {
        if let scanTool = ELM327(host: self.hostIpAddress.text!, andPort: 35000) {
            self.statusLabel.text = "Initializing..."
            scanTool.useLocation = true
            scanTool.delegate = self
            scanTool.startScanWithSensors({() -> [AnyObject] in
                dispatch_async(dispatch_get_main_queue(), {() -> Void in
                    self.statusLabel.text = "Scanning..."
                    self.scanToolLabel.text = scanTool.scanToolName
                })

//                let sensors: [AnyObject] = [    OBD2Sensor.SensorEngineRPM as! AnyObject,
//                                                OBD2Sensor.SensorVehicleSpeed as! AnyObject,
//                                                OBD2Sensor.SensorOxygenSensorsPresent as! AnyObject    ]

                let sensors: [AnyObject] = [    0x0C,
                                                0x0D,
                                                0x13    ]
                return sensors
            })
            self.scanTool = scanTool
            print("So far succesfull")
            scanning = !scanning
        } else {
            self.statusLabel.text = "Not working"
        }
    }

    func stopScan() {
        statusLabel.text = "Stopped"
        let scanTool: ELM327 = self.scanTool
        scanTool.cancelScan()
        scanTool.sensorScanTargets = nil
        scanTool.delegate = nil
        scanning = !scanning
    }

    // MARK: - FLScanToolDelegate


    func scanTool(scanTool: FLScanTool, sensor: FLECUSensor) {
        var sensorLabel: UILabel? = nil
        switch sensor.pid {

        case OBD2Sensor.SensorEngineRPM:
            sensorLabel = self.rpmLabel

        case OBD2Sensor.SensorVehicleSpeed:
            sensorLabel = self.speedLabel

        default:
            sensorLabel = self.tempLabel
        }

        self.showSensorValue(sensor, onLabel: sensorLabel!)
    }

    func showSensorValue(sensor: FLECUSensor, onLabel label: UILabel) {
        let sensorValue: String = "\(sensor.valueStringForMeasurement1(false)) \(sensor.imperialUnitString)"
        dispatch_async(dispatch_get_main_queue(), {() -> Void in
            label.text = sensorValue
        })
    }

}

编辑 1:

我现在已经可以扫描工具了，因为 ELM327 是一个 FLWiFiScanTool，而不是相反。我可以获得工具名称，因此它正在连接，但似乎无法获得传感器输出。

最佳答案

我设法弄清楚了。预期的传感器阵列应该是 NSNumbers 之一，所以我将传感器 UInt 转换到 NSNumbers。 而且我还错过了 scanTool 函数中的 didUpdateSensor 部分。

确保使用公制系统，在我的情况下，这在某种程度上更可靠。 (我的车也使用公制，也许这就是原因。)

import UIKit
import OBD2Kit

class ViewController: UIViewController, FLScanToolDelegate {
    var scanTool: ELM327!

    @IBOutlet weak var statusLabel: UILabel!
    @IBOutlet weak var scanToolLabel: UILabel!
    @IBOutlet weak var rpmLabel: UILabel!
    @IBOutlet weak var speedLabel: UILabel!
    @IBOutlet weak var tempLabel: UILabel!
    var scanning = false

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func scanButton(sender: UIButton) {
        if !scanning {
            startScan()
        } else {
            stopScan()
        }
    }

    func startScan() {
        if let scanTool = ELM327(host: "192.168.0.10", andPort: 35000) {
            self.statusLabel.text = "Initializing..."
            scanTool.useLocation = true
            scanTool.delegate = self
            scanTool.startScanWithSensors({() -> [AnyObject] in
                dispatch_async(dispatch_get_main_queue(), {() -> Void in
                    self.statusLabel.text = "Scanning..."
                    self.scanToolLabel.text = scanTool.scanToolName
                })

                let sensors: [AnyObject] = [ OBD2Sensor.SensorEngineRPM as NSNumber, OBD2Sensor.SensorVehicleSpeed as NSNumber, OBD2Sensor.SensorOxygenSensorsPresent as NSNumber ]

                return sensors
            })
            self.scanTool = scanTool
            print("So far succesfull")
            scanning = !scanning
        } else {
            self.statusLabel.text = "Not working"
        }
    }

    func stopScan() {
        statusLabel.text = "Stopped"
        let scanTool: ELM327 = self.scanTool
        scanTool.cancelScan()
        scanTool.sensorScanTargets = nil
        scanTool.delegate = nil
        scanning = !scanning
    }

    // MARK: - FLScanToolDelegate

    func scanTool(scanTool: FLScanTool!, didUpdateSensor sensor: FLECUSensor!) {
        var sensorLabel: UILabel? = nil
        switch sensor.pid {

        case OBD2Sensor.SensorEngineRPM:
            sensorLabel = self.rpmLabel

        case OBD2Sensor.SensorVehicleSpeed:
            sensorLabel = self.speedLabel

        default:
            sensorLabel = self.tempLabel
        }

        self.showSensorValue(sensor, onLabel: sensorLabel!)
    }

    func showSensorValue(sensor: FLECUSensor, onLabel label: UILabel) {
        let sensorValue: String = "\(sensor.valueStringForMeasurement1(true)) \(sensor.metricUnitString)"
        dispatch_async(dispatch_get_main_queue(), {() -> Void in
            label.text = sensorValue
        })
    }

}

关于ios - OBD2Kit Swift 示例无法进行类型转换，一直为零，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38714778/