如何在Swift中用户禁用位置时显示警报？

Question

我的Swift应用程序要求允许通过CLLocationManager访问当前位置.当用户点击"不允许"时,如何显示警告消息？

Answer 1

你想看看

func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) 

和

CLLocationManager.authorizationStatus()

第一个是在用户更改授权状态时调用的,第二个是允许您随时确定当前状态.

然后,显示消息,例如:

let alert = UIAlertController(title: "Your title", message: "GPS access is restricted. In order to use tracking, please enable GPS in the Settigs app under Privacy, Location Services.", preferredStyle: UIAlertControllerStyle.Alert)
            alert.addAction(UIAlertAction(title: "Go to Settings now", style: UIAlertActionStyle.Default, handler: { (alert: UIAlertAction!) in
                print("")
                UIApplication.sharedApplication().openURL(NSURL(string:UIApplicationOpenSettingsURLString)!)
            }))

上面的代码显示警报,并允许用户直接进入设置以启用位置.