Question

Xcode表示存在线程1：信号SIGABRT。它还说libc ++ abi.dylib：以类型为NSException的未捕获异常终止（lldb）。我是初学者，因此请“轻松”回复;）

//  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（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，并尝试确保它们确实已连接

打开情节提要文件，然后打开MapScreen.swift文件，如果连接器已连接，则应填充连接器
打开情节提要文件，然后单击以显示Assistant Editor，以便同时打开情节提要和MapScreen.swift文件，并确保在MapScreen中将Class设置为Identity Inspector，例如下面的屏幕截图

我还将列出一些有关MKMapView和LocationManager的建议

locationManager.requestWhenInUseAuthorization()

Info.plist将不起作用

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

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

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

一旦获得使用位置服务的权限，就必须询问locationManager.startUpdatingLocation()，这样您才能通过CLLocationManagerDelegate
位置更新是在locationManager(_:didUpdateLocations:)中接收的，为了能够在地图上查看用户位置，我们需要使用mapView.setRegion将地图区域设置为该位置

这是更新的课程

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: { $0.timestamp < $1.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)
    }

}

产生

我在Swift 10.2上运行自编码应用程序时遇到问题

1 个答案: