向地图添加折线时出现 EXC_BAD_ACCESS 错误

Question

尝试向 Google 地图添加折线时遇到

EXC_BAD_ACCESS (code=1, address=0x8)

错误。

如果我注释掉该行

polyline.map = mapView

，一切都会正常工作。

鉴于错误的模糊性，我不确定根本原因，或者是否只是因为我运行应用程序的模拟器太慢。我还无法在真实设备上进行测试。

let path = GMSMutablePath()
for coordinate in route.polyline.geoJsonLinestring.coordinates {
    path.add(CLLocationCoordinate2D(latitude: coordinate[1], longitude: coordinate[0]))
    print(coordinate)
}

let bounds = GMSCoordinateBounds(path: path)
let cameraUpdate = GMSCameraUpdate.fit(bounds, withPadding: 16)

DispatchQueue.main.async { [self] in
    let polyline = GMSPolyline(path: path)
    polyline.strokeColor = UIColor(named: "AccentColor")!
    polyline.strokeWidth = 5
    polyline.map = mapView
    
    mapView?.moveCamera(cameraUpdate)
}

崩溃不一定会立即发生 - 当我在添加折线后缩小地图时，这似乎是最常崩溃的时候。

更新：

我尝试更改

GPU Frame Capture

中的

Edit Scheme

设置，但没有任何影响。

我还创建了一个带有地图和硬编码的 2 坐标折线的简单视图，但它仍然崩溃。这就是字面上的意思：

override func viewDidLoad() {
    super.viewDidLoad()
    
    var coordinates = [
        [-2.9287110999999997, 54.8929171],
        [-2.8932368, 54.8968314],
    ]
    let path = GMSMutablePath()
    for coordinate in coordinates {
        path.add(CLLocationCoordinate2D(latitude: coordinate[1], longitude: coordinate[0]))
    }
    
    let bounds = GMSCoordinateBounds(path: path)
    let cameraUpdate = GMSCameraUpdate.fit(bounds, withPadding: 16)
    let polyline = GMSPolyline(path: path)
    polyline.strokeColor = UIColor(named: "AccentColor")!
    polyline.strokeWidth = 10
    polyline.map = mapView
    
    mapView?.moveCamera(cameraUpdate)
}

地图完全加载后崩溃，大约需要一分钟。

谷歌地图在模拟器中的表现总体来说很糟糕。地图视图似乎总是需要 >1 分钟才能完全加载（带有 Google 徽标的灰色视图，然后图块最终出现）。

Answer 1

这似乎是一个错误，因为我可以使用

maps-sdk-for-ios-samples

演示应用程序重现它。我已在这里提交了错误报告：https://issuetracker.google.com/issues/323404687

Answer 2

您只是将折线设置在错误的位置。如果您在

viewDidLoad

处设置一条线，您的地图将不会出现，并且应用程序将会崩溃。您应该将其设置为

viewDidAppear

。

import UIKit
import GoogleMaps
import MapKit

class HomeViewController: UIViewController, CLLocationManagerDelegate, GMSMapViewDelegate {
    // MARK: - Variables
    private let locationManager = CLLocationManager()
    
    // MARK: - IBOutlets
    @IBOutlet weak var mapView: GMSMapView!
    
    // MARK: - Life cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        
        MakeButtonStyle.defaultButtonStyle(button: createButton, title: "Create")
        MakeButtonStyle.defaultButtonStyle(button: editButton, title: "Edit")
        MakeButtonStyle.defaultButtonStyle(button: deleteButton, title: "Delete")
        
        /* mapView and locationManager */       
        mapView.delegate = self
        mapView.isMyLocationEnabled = true
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        let coordinates = [
            [-2.9287110999999997, 54.8929171],
            [-2.8932368, 54.8968314],
        ]
        let path = GMSMutablePath()
        for coordinate in coordinates {
            path.add(CLLocationCoordinate2D(latitude: coordinate[1], longitude: coordinate[0]))
        }
        let bounds = GMSCoordinateBounds(path: path)
        let cameraUpdate = GMSCameraUpdate.fit(bounds, withPadding: 16)
        let polyline = GMSPolyline(path: path)
        polyline.strokeColor = UIColor.red
        polyline.strokeWidth = 10
        polyline.map = mapView
        mapView?.moveCamera(cameraUpdate)
    }
    
    // MARK: - locationManager delegate
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        guard status == .authorizedWhenInUse else {
            return
        }
        
        locationManager.startUpdatingLocation()
        mapView.isMyLocationEnabled = true
        mapView.settings.myLocationButton = true
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.first else {
            return
        }
        
        let cameraPosition = GMSCameraPosition(target: location.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)
        mapView.camera = cameraPosition
        locationManager.stopUpdatingLocation()
        reverseGeocodeCoordinate(cameraPosition.target)
    }
}

以下是我的 iPhone sim 的屏幕截图。