我在尝试请求位置服务授权时遇到了很多麻烦。我知道这个论坛上还有其他帖子，但我没有用他们的解决方案解决我的问题。
这是xCode中弹出的错误：
Trying to start MapKit location updates without prompting for location authorization. Must call -[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager requestAlwaysAuthorization] first.
我已经为 Plist 添加了两个必需的键。
另一个重要的一点是，当我在模拟器中启动它时，我可以手动进入设置并启用位置服务，然后应用程序就可以工作了。但是，当我重新启动应用程序时它不起作用，并且我收到上面相同的消息。
我想提示用户启用位置服务的选项。不幸的是，此代码不会提示位置服务的授权。
请帮助我已经拉了几个小时的头发。1
- (void)viewDidLoad {
[super viewDidLoad];
self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate = self;
if ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)])
{
[self.locationManager requestAlwaysAuthorization];
}
[self.locationManager startUpdatingLocation];
//Initialize the map and specifiy bounds
self.myMapView =[[MKMapView alloc]initWithFrame:self.view.bounds];
//specifcy resizing
self.myMapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
//show the User's location and set tracking mode
self.myMapView.showsUserLocation = YES;
self.myMapView.userTrackingMode = MKUserTrackingModeFollow;
//add the VIEW!!
[self.view addSubview:self.myMapView];
}
这是我要调用的函数
- (void)requestAlwaysAuthorization
{
CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
// If the status is denied or only granted for when in use, display an alert
if (status == kCLAuthorizationStatusAuthorizedWhenInUse || status == kCLAuthorizationStatusDenied) {
NSString *title;
title = (status == kCLAuthorizationStatusDenied) ? @"Location services are off" : @"Background location is not enabled";
NSString *message = @"To use background location you must turn on 'Always' in the Location Services Settings";
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title
message:message
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"Settings", nil];
[alertView show];
}
// The user has not enabled any location services. Request background authorization.
else if (status == kCLAuthorizationStatusNotDetermined) {
[self.locationManager requestAlwaysAuthorization];
}
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 1) {
// Send the user to the Settings for this app
NSURL *settingsURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
[[UIApplication sharedApplication] openURL:settingsURL];
}
}