Question

为什么这段代码不起作用？我想这是用didUpdateLocations高估方法的东西？我如何正确地将它们与我的标签连接起来并使它们成为现场：）

import UIKit
import CoreLocation

class MainVC: UIViewController, CLLocationManagerDelegate {

var walking = false
var pause = false
var locationManager: CLLocationManager = CLLocationManager()
var startLocation: CLLocation!
var speed: CLLocationSpeed = CLLocationSpeed()

@IBOutlet weak var latitudeLabel: UILabel!
@IBOutlet weak var longitudeLabel: UILabel!

@IBOutlet weak var horizontalAccuracyLabel: UILabel!
@IBOutlet weak var verticalAccuracyLabel: UILabel!

@IBOutlet weak var distanceLabel: UILabel!
@IBOutlet weak var altitudeLabel: UILabel!

@IBOutlet weak var speedLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()
    locationManager.startUpdatingHeading()
    startLocation = nil

    // Ask for Authorisation from the User.
    self.locationManager.requestAlwaysAuthorization()

    // For use in foreground
    self.locationManager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationManager.startUpdatingLocation()
    }
}

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

@IBAction func startDistance(_ sender: UIButton) {
    startLocation = nil
    walking = true
}

@IBAction func stopDistance(_ sender: UIButton) {
    walking = false
}

@IBAction func resetDistance(_ sender: UIButton) {
    startLocation = nil
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    let latestLocation: AnyObject = locations[locations.count - 1]

    latitudeLabel.text = String(format: "%.4f",latestLocation.coordinate.latitude)
    longitudeLabel.text = String(format: "%.4f",latestLocation.coordinate.longitude)

    horizontalAccuracyLabel.text = String(format: "%.4f",latestLocation.horizontalAccuracy)
    verticalAccuracyLabel.text = String(format: "%.4f",latestLocation.verticalAccuracy)

    altitudeLabel.text = String(format: "%.4f",latestLocation.altitude)

    if walking == true {
        if startLocation == nil {
            startLocation = latestLocation as! CLLocation
            speed = locationManager.location!.speed
            speedLabel.text = String(format: "%.0f km/h", speed * 3.6)
        }

        let distanceBetween: CLLocationDistance =
            latestLocation.distance(from: startLocation)

        distanceLabel.text = String(format: "%.2f", distanceBetween)
    }
}


func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading)
{
 //   capLabel.text = String(format: "%.4f",newHeading.magneticHeading)
}


func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {

}

 }

我还在info.plist中添加了：Location Always Usage Description 我也在模拟器的设置中允许位置。

谢谢。

Answer 1

要在 Swift 4 中始终为我可以看到您已在代码self.locationManager.requestAlwaysAuthorization()中编写的位置服务配置授权，请执行以下操作：

您的info.plist

还需要一个新密钥 NSLocationAlwaysAndWhenInUsageDescription

<key>NSLocationAlwaysUsageDescription</key>
    <string> location permission text.</string>
<key>NSLocationWhenInUseUsageDescription</key>
    <string> location permission text.</string>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
    <string> location permission text.</string>

查看文档here

您需要包含 NSLocationWhenInUseUsageDescription 和应用中的 NSLocationAlwaysAndWhenInUsageDescription 键 Info.plist文件。（如果您的应用支持iOS 10及更早版本，那么 NSLocationAlwaysUsageDescription 键也是必需的。）如果这些键不存在，授权请求立即失败。

所以我们现在会有一个提示。

Swift 4 CoreLocation无效

1 个答案: