我一直在做一些有关CoreLocation的研究。最近，我遇到了一个问题，该问题已在其他地方（Objective C和iOS 8）解决。
我觉得这有点愚蠢，但是如何在iOS 9上检查是否使用swift启用了定位服务？
在iOS 7（可能是8？）上，您可以使用locationServicesEnabled()，但是在为iOS 9编译时似乎无法正常工作。
那我该怎么做呢？
谢谢！
Answers:
将添加CLLocationManagerDelegate到您的类继承中，然后可以进行以下检查：
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")
}
authorizationStatus被设置于notDetermined然后，而不是仅仅记录它会更好，以提示用户“允许/不允许”
在Objective-C中
您应该跟踪已被拒绝或不确定的用户，然后请求权限或将用户发送到“设置应用”。
-(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];
}
}
实施alertView Delegate，然后发送用户以启用位置服务（如果已被用户拒绝）。
-(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。
这是Apple建议的格式。
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AlertView带有按钮的按钮，Settings如果以前拒绝访问，则将用户带到屏幕。
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
}
}
}
}
对于swift3.0及更高版本，如果经常检查位置服务的可用性，请创建如下所示的类，
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)
}
}
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locationManager:didFailWithError带有kCLErrorDenied错误代码的- ：调用。这适用于所有版本的iOS。
Use of unresolved identifier 'kCLErrorDenied'。有什么想法吗？
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
}
要请求位置服务的许可，请使用：
yourSharedLocationManager.requestWhenInUseAuthorization()
如果当前状态不确定，则会显示一条警报，提示用户允许访问。如果访问被拒绝，则将在CLLocationManagerDelegate中通知您的应用程序，同样，如果在任何时候都拒绝许可，您将在此处进行更新。
您需要检查两种独立的状态来确定当前权限。
CLLocationManager.locationServicesEnabled()
CLLocationManager.authorizationStatus() == .authorizedWhenInUse
您可以添加扩展名是一个方便的选择：
extension CLLocationManager {
static func authorizedToRequestLocation() -> Bool {
return CLLocationManager.locationServicesEnabled() &&
(CLLocationManager.authorizationStatus() == .authorizedAlways || CLLocationManager.authorizationStatus() == .authorizedWhenInUse)
}
}
当用户首次请求路线时，可以在此处访问它：
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)
}
}
manager.locationServicesEnabled()而不是已CLLocationManager.loationServicesEnabled()解决！