运行我在 Swift 10.2 上的自编码应用程序有问题

Question

Xcode 表示有一个 Thread 1: signal SIGABRT 。它还说 libc++abi.dylib: 终止与 NSException 类型的未捕获异常（LLDB）。我是初学者所以请回复 "easily" ;)

//  ViewController.swift

import UIKit
import MapKit
import CoreLocation

class MapScreen: UIViewController {

    @IBOutlet weak var mapView: MKMapView!

    let locationManager = CLLocationManager()


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        checkLocationServices()
    }

    func setupLocationManager() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
    }


    func checkLocationServices() {
        if CLLocationManager.locationServicesEnabled() {
            setupLocationManager()
            checkLocationAuthorization()
        }else{
            // show alert letting the user know he has to turn them on.
        }
    }


    func checkLocationAuthorization() {
        switch CLLocationManager.authorizationStatus() {
        case .authorizedWhenInUse:
            mapView.showsUserLocation = true
            break
        case .denied:
            // show alert instructing how to turn on permissions
            break
        case .notDetermined:
            locationManager.requestWhenInUseAuthorization()
        case .restricted:
            // show an alert letting them know what's up
            break
        case .authorizedAlways:
            break
        }
    }
}


    extension MapScreen: CLLocationManagerDelegate {
        func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
            // later
            }
        func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
            // later
        }
    }

Answer 1

要填充圆圈（在将 UI 控件连接到情节提要的 @IBOutlet 旁边）您需要同时打开 .swift 文件和情节提要，尝试使用这些来制作确保其实际连接

打开storyboard文件，然后打开MapScreen.swift文件，连接器需要填写
打开故事板文件并单击以显示 Assistant Editor 因此故事板和 MapScreen.swift 文件同时打开，还要确保在 [= 中将 Class 设置为 MapScreen 18=]，如下图所示

我还会列出一些关于 MKMapView 和 LocationManager 的建议

locationManager.requestWhenInUseAuthorization()将不起作用，如果Info.plist没有以下一个或多个用法说明

<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Message for AlwaysAndWhenInUseUsageDescription</string>

<key>NSLocationAlwaysUsageDescription</key>
<string>Message for AlwaysUsageDescription</string>

<key>NSLocationWhenInUseUsageDescription</key>
<string>Message for WhenInUseUsageDescription</string>

一旦获得使用定位服务的权限，就需要询问locationManager.startUpdatingLocation()，这样您将通过CLLocationManagerDelegate
在 locationManager(_:didUpdateLocations:) 内收到位置更新，为了能够在地图上看到用户位置，我们需要使用 mapView.setRegion

这是更新后的 class

class MapScreen: UIViewController {

    @IBOutlet var mapView: MKMapView!
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()

        setupLocationManager()
    }

    func setupLocationManager() {
        guard CLLocationManager.locationServicesEnabled() else {
            // show alert letting the user know he has to turn them on.
            print("Location Servies: Disabled")
            return
        }

        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest

        checkLocationAuthorization()
    }

    func checkLocationAuthorization(authorizationStatus: CLAuthorizationStatus? = nil) {
        switch (authorizationStatus ?? CLLocationManager.authorizationStatus()) {
        case .authorizedAlways, .authorizedWhenInUse:
            locationManager.startUpdatingLocation()
            mapView.showsUserLocation = true
        case .restricted, .denied:
            // show alert instructing how to turn on permissions
            print("Location Servies: Denied / Restricted")
        case .notDetermined:
            locationManager.requestWhenInUseAuthorization()
        }
    }
}


extension MapScreen: CLLocationManagerDelegate {

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.count > 1 ? locations.sorted(by: { [=11=].timestamp < .timestamp }).last : locations.first else { return }

        let span = MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
        let region = MKCoordinateRegion(center: location.coordinate, span: span)
        mapView.setRegion(region, animated: true)
    }

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        self.checkLocationAuthorization(authorizationStatus: status)
    }

}

产量

运行我在 Swift 10.2 上的自编码应用程序有问题

I have a problem on running my self coded app on Swift 10.2

mapkit

sigabrt

ios

swift

运行 我在 Swift 10.2 上的自编码应用程序有问题

I have a problem on running my self coded app on Swift 10.2

mapkit

sigabrt

ios

swift

运行我在 Swift 10.2 上的自编码应用程序有问题