为啥'CLLocationManager.locationServicesEnabled()'默认为真？

Posted 2023-03-05

【中文标题】为啥\'CLLocationManager.locationServicesEnabled()\'默认为真？

【英文标题】：Why is 'CLLocationManager.locationServicesEnabled()' true by default?为什么'CLLocationManager.locationServicesEnabled()'默认为真？

【发布时间】：2016-01-24 03:29:14

【问题描述】：

我在 Xcode 中通过一个简单的全新项目注意到以下内容。

如果我在 ViewController.swift 文件中导入 CoreLocation，然后在 viewDidLoad 方法中添加...

打印(CLLocationManager.locationServicesEnabled())

...，当应用程序在模拟器中运行时，Xcode 打印出 true。我原以为默认情况下会禁用位置服务，但正如您自己所见，事实恰恰相反。如果我愿意，我可以添加更多代码来收集有关用户的位置信息，而这一切都无需请求许可。

谁能解释这是为什么？

【参考方案1】：

据我所知，CLLocationManager.locationServicesEnabled() 将返回是否在设备上启用了位置服务，而不仅仅是针对那个应用程序。因此，即使该应用程序禁用了位置服务，如果为设备启用了它们，我认为这仍然会返回 true，根据文档：https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLLocationManager_Class/#//apple_ref/occ/clm/CLLocationManager/locationServicesEnabled

在我的应用中，我是这样设置的：

    //check if location services are enabled at all
    if CLLocationManager.locationServicesEnabled() 

        switch(CLLocationManager.authorizationStatus()) 
        //check if services disallowed for this app particularly
        case .Restricted, .Denied:
            print("No access")
            var accessAlert = UIAlertController(title: "Location Services Disabled", message: "You need to enable location services in settings.", preferredStyle: UIAlertControllerStyle.Alert)

            accessAlert.addAction(UIAlertAction(title: "Okay!", style: .Default, handler:  (action: UIAlertAction!) in UIApplication.sharedApplication().openURL(NSURL(string:UIApplicationOpenSettingsURLString)!)
            ))

            presentViewController(accessAlert, animated: true, completion: nil)

        //check if services are allowed for this app
        case .AuthorizedAlways, .AuthorizedWhenInUse:
            print("Access! We're good to go!")
        //check if we need to ask for access
        case .NotDetermined:
            print("asking for access...")
            manager.requestAlwaysAuthorization()
        
    //location services are disabled on the device entirely!
     else 
        print("Location services are not enabled")

    

祝你好运！

【讨论】：

完美。正是我需要的知识。

太棒了！如果我有帮助，您可以将其标记为答案 :)

【参考方案2】：

Swift 3.1 函数返回状态和错误信息

func isLocationEnabled() -> (status: Bool, message: String) 
    if CLLocationManager.locationServicesEnabled() 
        switch(CLLocationManager.authorizationStatus()) 
        case .notDetermined, .restricted, .denied:
            return (false,"No access")
        case .authorizedAlways, .authorizedWhenInUse:
            return(true,"Access")
        
     else 
        return(false,"Turn On Location Services to Allow App to Determine Your Location")