检查定位服务是否开启

Question

我一直在研究 CoreLocation。最近，我遇到了一个在其他地方已经涵盖的问题，但是在 Objective C 和 iOS 8.

我觉得问这个问题有点傻，但是您如何在 iOS 9 上使用 swift 检查是否启用了定位服务？

在 iOS 7（也许是 8？）上，您可以使用 locationServicesEnabled()，但在为 iOS 9.[=11= 编译时似乎不起作用]

那么我该如何完成呢？

谢谢！

Answer 1

当您调用 -startLocation 时，如果位置服务被用户拒绝，位置管理器委托将收到对 - locationManager:didFailWithError 的调用：带有 kCLErrorDenied 错误代码。这适用于 iOS.

的所有版本

Answer 2

将 CLLocationManagerDelegate 添加到您的 class 继承中，然后您可以进行此检查：

导入 CoreLocation 框架

import CoreLocation

Swift 1.x - 2.x 版本：

if CLLocationManager.locationServicesEnabled() {
    switch CLLocationManager.authorizationStatus() {
    case .NotDetermined, .Restricted, .Denied:
        print("No access")
    case .AuthorizedAlways, .AuthorizedWhenInUse:
        print("Access")
    }
} else {
    print("Location services are not enabled")
}

Swift 4.x 版本：

if CLLocationManager.locationServicesEnabled() {
     switch CLLocationManager.authorizationStatus() {
        case .notDetermined, .restricted, .denied:
            print("No access")
        case .authorizedAlways, .authorizedWhenInUse:
            print("Access")
     }
} else {
    print("Location services are not enabled")
}

Swift 5.1 版本

if CLLocationManager.locationServicesEnabled() {
    switch CLLocationManager.authorizationStatus() {
        case .notDetermined, .restricted, .denied:
            print("No access")
        case .authorizedAlways, .authorizedWhenInUse:
            print("Access")
        @unknown default:
            break
    }
} else {
    print("Location services are not enabled")
}

iOS 14.x

在 iOS 14 中，您将收到以下错误消息： authorizationStatus() 在 iOS 14.0 中被弃用

要解决此问题，请使用以下内容：

private let locationManager = CLLocationManager()

if CLLocationManager.locationServicesEnabled() {
    switch locationManager.authorizationStatus {
        case .notDetermined, .restricted, .denied:
            print("No access")
        case .authorizedAlways, .authorizedWhenInUse:
            print("Access")
        @unknown default:
            break
    }
} else {
    print("Location services are not enabled")
}

Answer 3

在objective-c

您应该跟踪已被拒绝或未确定的用户，然后请求许可或将用户发送到设置应用程序。

-(void)askEnableLocationService
{
   BOOL showAlertSetting = false;
   BOOL showInitLocation = false;

   if ([CLLocationManager locationServicesEnabled]) {

      switch ([CLLocationManager authorizationStatus]) {
        case kCLAuthorizationStatusDenied:
            showAlertSetting = true;
            NSLog(@"HH: kCLAuthorizationStatusDenied");
            break;
        case kCLAuthorizationStatusRestricted:
            showAlertSetting = true;
            NSLog(@"HH: kCLAuthorizationStatusRestricted");
            break;
        case kCLAuthorizationStatusAuthorizedAlways:
            showInitLocation = true;
            NSLog(@"HH: kCLAuthorizationStatusAuthorizedAlways");
            break;
        case kCLAuthorizationStatusAuthorizedWhenInUse:
            showInitLocation = true;
            NSLog(@"HH: kCLAuthorizationStatusAuthorizedWhenInUse");
            break;
        case kCLAuthorizationStatusNotDetermined:
            showInitLocation = true;
            NSLog(@"HH: kCLAuthorizationStatusNotDetermined");
            break;
        default:
            break;
      }
   } else {

      showAlertSetting = true;
      NSLog(@"HH: locationServicesDisabled");
  }

   if (showAlertSetting) {
       UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil message:@"Please enable location service for this app in ALLOW LOCATION ACCESS: Always, Go to Setting?" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Open Setting", nil];
       alertView.tag = 199;
       [alertView show];
   }
   if (showInitLocation) {
       [self initLocationManager];
   }

}

如果用户已经拒绝，则执行 alertView Delegate 然后发送用户启用位置服务。

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

   if (alertView.tag == 199) {
       if (buttonIndex == 1) {
           [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
       }
       return;
   }
}

初始化位置管理器

-(void)initLocationManager{
   self.locationManager = [[CLLocationManager alloc] init];
   if([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
       [self.locationManager requestAlwaysAuthorization];
   }
}

请注意 kCLAuthorizationStatusAuthorizedAlways 和 kCLAuthorizationStatusAuthorizedWhenInUse 是不同的。

Answer 4

SWIFT （截至 2018 年 7 月 24 日）

if CLLocationManager.locationServicesEnabled() {

}

这会告诉您用户是否已经为应用的位置权限请求选择了设置

Answer 5

对于swift3.0及以上版本，如果经常检查位置服务的可用性，请创建一个 class，如下所示，

    import CoreLocation

    open class Reachability {
        class func isLocationServiceEnabled() -> Bool {
            if CLLocationManager.locationServicesEnabled() {
                switch(CLLocationManager.authorizationStatus()) {
                    case .notDetermined, .restricted, .denied:
                    return false
                    case .authorizedAlways, .authorizedWhenInUse:
                    return true
                    default:
                    print("Something wrong with Location services")
                    return false
                }
            } else {
                    print("Location services are not enabled")
                    return false
              }
            }
         }

然后在您的 VC

中像这样使用它

    if Reachability.isLocationServiceEnabled() == true {
    // Do what you want to do.
    } else {
    //You could show an alert like this.
        let alertController = UIAlertController(title: "Location 
        Services Disabled", message: "Please enable location services 
        for this app.", preferredStyle: .alert)
        let OKAction = UIAlertAction(title: "OK", style: .default, 
        handler: nil)
        alertController.addAction(OKAction)
        OperationQueue.main.addOperation {
            self.present(alertController, animated: true, 
            completion:nil)
        }
    }

Answer 6

它只是 Swift 4 中的一个 2 行函数：

import CoreLocation

static func isLocationPermissionGranted() -> Bool
{
    guard CLLocationManager.locationServicesEnabled() else { return false }
    return [.authorizedAlways, .authorizedWhenInUse].contains(CLLocationManager.authorizationStatus())
}

Answer 7

在Swift3.0

if (CLLocationManager.locationServicesEnabled())
            {
                locationManager.delegate = self
                locationManager.desiredAccuracy = kCLLocationAccuracyBest
                if ((UIDevice.current.systemVersion as NSString).floatValue >= 8)
                {
                    locationManager.requestWhenInUseAuthorization()
                }

                locationManager.startUpdatingLocation()
            }
            else
            {
                #if debug
                    println("Location services are not enabled");
                #endif
            }

Answer 8

为您使用的定位服务请求许可：

yourSharedLocationManager.requestWhenInUseAuthorization()

如果当前状态未定，将显示警告提示用户允许访问。如果访问被拒绝，您的应用程序将在 CLLocationManagerDelegate 中收到通知，同样，如果权限在任何时候被拒绝，您将在此处更新。

您需要检查两个不同的状态以确定当前权限。

用户是否启用了一般定位服务

CLLocationManager.locationServicesEnabled()

如果用户为您的应用授予了正确的权限..

CLLocationManager.authorizationStatus() == .authorizedWhenInUse

您可以添加扩展名是一个方便的选项：

extension CLLocationManager {
static func authorizedToRequestLocation() -> Bool {
    return CLLocationManager.locationServicesEnabled() &&
        (CLLocationManager.authorizationStatus() == .authorizedAlways || CLLocationManager.authorizationStatus() == .authorizedWhenInUse)
}

}

当用户第一次请求路线时正在访问这里：

 private func requestUserLocation() {
    //when status is not determined this method runs to request location access
    locationManager.requestWhenInUseAuthorization()

    if CLLocationManager.authorizedToRequestLocation() {

        //have accuracy set to best for navigation - accuracy is not guaranteed it 'does it's best'
        locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation

        //find out current location, using this one time request location will start the location services and then stop once have the location within the desired accuracy -
        locationManager.requestLocation()
    } else {
        //show alert for no location permission
        showAlertNoLocation(locationError: .invalidPermissions)
    }
}

这是代表：

 func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {

    if !CLLocationManager.authorizedToRequestLocation() {
        showAlertNoLocation(locationError: .invalidPermissions)
    }
}

Answer 9

这是 Apple 推荐的格式。

  switch CLLocationManager.authorizationStatus() {
      case .notDetermined:
         // Request when-in-use authorization initially
         break
      case .restricted, .denied:
         // Disable location features
         break
      case .authorizedWhenInUse, .authorizedAlways:
         // Enable location features
         break
      }

这是一个完整的例子。

这包括一个 AlertView 和一个按钮，如果之前被拒绝访问，则将用户带到 Settings 屏幕。

import CoreLocation
let locationManager = CLLocationManager()

class SettingsTableViewController:CLLocationManagerDelegate{

    func checkUsersLocationServicesAuthorization(){
        /// Check if user has authorized Total Plus to use Location Services
        if CLLocationManager.locationServicesEnabled() {
            switch CLLocationManager.authorizationStatus() {
            case .notDetermined:
                // Request when-in-use authorization initially
                // This is the first and the ONLY time you will be able to ask the user for permission
                self.locationManager.delegate = self
                locationManager.requestWhenInUseAuthorization()
                break

            case .restricted, .denied:
                // Disable location features
                switchAutoTaxDetection.isOn = false
                let alert = UIAlertController(title: "Allow Location Access", message: "MyApp needs access to your location. Turn on Location Services in your device settings.", preferredStyle: UIAlertController.Style.alert)

                // Button to Open Settings
                alert.addAction(UIAlertAction(title: "Settings", style: UIAlertAction.Style.default, handler: { action in
                    guard let settingsUrl = URL(string: UIApplication.openSettingsURLString) else {
                        return
                    }
                    if UIApplication.shared.canOpenURL(settingsUrl) {
                        UIApplication.shared.open(settingsUrl, completionHandler: { (success) in
                            print("Settings opened: \(success)") 
                        })
                    }
                }))
                alert.addAction(UIAlertAction(title: "Ok", style: UIAlertAction.Style.default, handler: nil))
                self.present(alert, animated: true, completion: nil)

                break

            case .authorizedWhenInUse, .authorizedAlways:
                // Enable features that require location services here.
                print("Full Access")
                break
            }
        }
    }
}

Answer 10

Swift 5.2

首先，将用户 class 设置为 CLLocationManager 委托：

import SwiftUI
import CoreLocation

class User: NSObject, ObservableObject {

   let manager = CLLocationManager()

   override init() {
      super.init()
      manager.delegate = self
      manager.requestWhenInUseAuthorization()
      manager.requestLocation()
      manager.startUpdatingLocation()
   }
}

extension User: CLLocationManagerDelegate {

   func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
      print("Location services authorization request")
   }

   func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
      print("Location updated")
   }

   func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
      print("Failed to find user's location: \(error.localizedDescription)")
   }
 }

然后在视图中：

if (user.manager.authorizationStatus == .denied) {
   print("Location authorization denied, displaying sheet.")      
}

检查定位服务是否开启

Check if location services are enabled

xcode

location

ios

swift

Swift 4.x 版本：

Swift 5.1 版本

iOS 14.x

这是一个完整的例子。