OBD2Kit Swift示例无法强制转换，一直为零 [英] OBD2Kit Swift example can't typecast, keep getting nil

问题描述

由于没有使用OBD2Kit和Swift的示例代码，因此我将其分叉到 https://github.com/YannisDC/OBD2Kit 并将其用作吊舱.

Since there was no example code for using OBD2Kit and Swift I forked it into https://github.com/YannisDC/OBD2Kit and used it as a pod.

我翻译了一些OBJ-C示例代码，但似乎无法将FLWiFiScanTool转换为ELM327类型.为什么我不断变得零?

I translated some OBJ-C example code but can't seem to downcast the FLWiFiScanTool into the ELM327 type. Why do I keep getting nil?

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
        })
    }

}

由于ELM327是FLWiFiScanTool，而不是其他方式，我现在已经可以搜索该工具了.我可以获取工具名称，以便它可以连接，但似乎无法获取传感器的输出.

I can already scan for the tool now since ELM327 is a FLWiFiScanTool and not the other way around. I can get the toolname so it's connecting but can't seem to get the sensors output.

推荐答案

我设法弄清楚了.预期的传感器数组应为NSNumbers之一，因此我将传感器UInt强制转换为NSNumbers. 而且我也错过了scanTool函数中的didUpdateSensor部分.

I managed to figure it out. The expected sensors array should be one of NSNumbers so I casted the sensors UInt's to NSNumbers. And I also missed the didUpdateSensor part in the scanTool function.

请确保使用公制，以我的方式，这在某种程度上更加可靠. (我的车也使用公制，也许就是这个原因.)

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
        })
    }

}

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