构建地图应用程序ios时出现致命错误

遇到一个错误，我整天都在搜索如何使用Corelocation和GoogleMaps。当我在代码的GMScameraposition部分出错时，我想我已经有了它。基本上，我试图在加载视图时获取我的位置，这就是为什么大多数都在viewdidload（）中

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视图在更新位置以填充变量之前加载，所以正如您在评论中所说，long和lat变量没有值

我在这里为您编写了fixed viewDidLoad和didUpdateLocations函数：

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager = CLLocationManager()
        locationManager.delegate = self;
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestAlwaysAuthorization()
        locationManager.startUpdatingLocation()

        let camera = GMSCameraPosition.cameraWithLatitude(0,
            longitude: 0, zoom:0) //this can be set to wherever you want your view to start at

        //UPDATE: changed the initializing frame to be equal to the view, instead of CGRectZero
        let mapView = GMSMapView.mapWithFrame(self.view.frame, camera:camera)

        let marker = GMSMarker()
        marker.position = camera.target
        marker.snippet = "Hello World"
        marker.appearAnimation = kGMSMarkerAnimationPop
        marker.map = mapView

        self.view = mapView
    }

    //updated! This will tell your camera to snap to your latest location once you've received it.
    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        currentLocation = locations.last
        mapView.camera = GMSCameraPosition(target: currentLocation.coordinate, zoom: 6, bearing: 0, viewingAngle: 0)
    }
}

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让我知道这是否适合您。

您遇到了什么错误？请不要让我们猜。很抱歉，我没有提到这件事。“exc_bad_指令（code=exc_i386_invop subcode=0x0）”这是我尝试构建时出现的情况。我进一步了解了错误，我认为是“long”和“lat”变量没有值，然后被传递到gmscameraposition“self.view=mapView”行，给出了“使用未解析标识符‘mapView’”。我试着将它移到下面的locationManager函数中，它不知怎么消失了，但仍然没有显示地图。因为mapView是通过编程方式创建的，所以我们必须设置默认的相机视图，并在设置lat和long后更新相机。我已经更新了我的帖子以反映这些更改。我认为我们需要将mapView设置为全局变量，因为我遇到了与上次相同的错误，但出现在func locationManager中的“mapView.camera”行上。没错，请继续为mapView添加一个全局变量，看看它是否有效。好的，我尝试了，没有错误，这是一个加号，但是没有地图出现。

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager = CLLocationManager()
        locationManager.delegate = self;
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestAlwaysAuthorization()
        locationManager.startUpdatingLocation()

        let camera = GMSCameraPosition.cameraWithLatitude(0,
            longitude: 0, zoom:0) //this can be set to wherever you want your view to start at

        //UPDATE: changed the initializing frame to be equal to the view, instead of CGRectZero
        let mapView = GMSMapView.mapWithFrame(self.view.frame, camera:camera)

        let marker = GMSMarker()
        marker.position = camera.target
        marker.snippet = "Hello World"
        marker.appearAnimation = kGMSMarkerAnimationPop
        marker.map = mapView

        self.view = mapView
    }

    //updated! This will tell your camera to snap to your latest location once you've received it.
    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        currentLocation = locations.last
        mapView.camera = GMSCameraPosition(target: currentLocation.coordinate, zoom: 6, bearing: 0, viewingAngle: 0)
    }
}