GoogleMaps iOS SDK GMSMapView Class 已取消分配

Question

我正在努力将 GoogleMaps iOS SDK 集成到我的项目中，但我不断收到此错误：

'NSInternalInconsistencyException' 'An instance 0x7fea5e93e210 of class GMSMapView was deallocated while key value observers were still registered with it. Current observation info:

这是我的视图控制器代码：

import UIKit
import GoogleMaps

class ViewController: UIViewController, CLLocationManagerDelegate, GMSMapViewDelegate {

var locationManager = CLLocationManager()

var didFindMyLocation = false

let mapView = GMSMapView()

override func viewDidLoad() {
    super.viewDidLoad()

    let mapView = GMSMapView()


    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()

    let camera: GMSCameraPosition = GMSCameraPosition.cameraWithLatitude(37.61729,longitude: -122.38229, zoom: 18)

    mapView.camera = camera

    mapView.delegate = self

    mapView.addObserver(self, forKeyPath: "myLocation", options: NSKeyValueObservingOptions.New, context: nil)
}

override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
    if !didFindMyLocation {
        let myLocation: CLLocation = change![NSKeyValueChangeNewKey] as! CLLocation
        mapView.camera = GMSCameraPosition.cameraWithTarget(myLocation.coordinate, zoom: 18.0)
        mapView.settings.myLocationButton = true

           didFindMyLocation = true
        }
    }

}

Answer 1

正如它所说："key value observers were still registered with it"，这实际上是在抱怨您没有注销 KVO 观察器。

KVO，在这个意义上，有点像 NSNotification - 如果你在 viewDidLoad: 中注册了一个观察者，你需要在 viewDidDisappear: 中删除观察者或 dealloc.

在您的情况下，尝试添加 dealloc 功能并使用 removeObserver:forKeyPath:context: 取消订阅 KVO。在 mattt 的 KVO 文章中阅读更多内容 here。

Answer 2

Swift 3

deinit {
            mapView.removeObserver(self, forKeyPath: "myLocation")
}

GoogleMaps iOS SDK GMSMapView Class 已取消分配

GoogleMaps iOS SDK GMSMapView Class Deallocated

ios

google-maps-sdk-ios

swift