我一直在对 CoreLocation 进行一些研究。最近，我遇到了一个在其他地方已经讨论过的问题，但在 Objective C 和 iOS 8 中。
我觉得问这个有点傻，但是你如何检查是否在 iOS 9 上使用 swift 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 编译时似乎不起作用。
那么我该如何实现呢？
谢谢！
【问题讨论】：
将CLLocationManagerDelegate 添加到您的类继承中，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")
}
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")
}
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")
}
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")
}
【讨论】：
manager.locationServicesEnabled() 而不是 CLLocationManager.loationServicesEnabled() 已解决！
authorizationStatus 设置 设置为notDetermined 然后而不是只是记录它会更好地提示用户“允许/不允许”
在objective-c中
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];
}
}
如果已经被用户拒绝，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 的区别。
【讨论】：
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
}
这包括一个带有按钮的AlertView，如果之前被拒绝访问，该按钮可将用户带到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
}
}
}
}
【讨论】：
SWIFT （截至 2018 年 7 月 24 日）
if CLLocationManager.locationServicesEnabled() {
}
这将告诉您用户是否已经为应用的位置权限请求选择了设置
【讨论】：
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())
}
【讨论】：
对于 swift3.0 及以上版本， 如果经常检查位置服务的可用性，请创建一个如下所示的类，
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
}
}
}
然后在你的 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)
}
}
【讨论】：
当您调用 -startLocation 时，如果用户拒绝了位置服务，则位置管理器委托将收到对 -locationManager:didFailWithError: 的调用，并带有 kCLErrorDenied 错误代码。这适用于所有版本的 iOS。
【讨论】：
Use of unresolved identifier 'kCLErrorDenied'。想法？
在 Swift 3.0 中
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
}
【讨论】：
为您使用的定位服务请求许可：
yourSharedLocationManager.requestWhenInUseAuthorization()
如果当前状态未确定，则会显示警报，提示用户允许访问。如果访问被拒绝，您的应用将在 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。
您需要检查两种不同的状态以确定当前权限。
CLLocationManager.locationServicesEnabled()
CLLocationManager.authorizationStatus() == .authorizedWhenInUse
您可以添加一个扩展是一个方便的选择：
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，它正在被访问：
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)
}
}
【讨论】：
Swift 5.2
首先，将 User 类设置为 CLLocationManager 委托：
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)")
}
}
然后在一个视图中：
if (user.manager.authorizationStatus == .denied) {
print("Location authorization denied, displaying sheet.")
}
【讨论】：