cllocationmanager

问题 I've setup (default iOS8) location-based notifications for my app. UILocalNotification *notification = [[UILocalNotification alloc] init]; notification.regionTriggersOnce = NO; notification.userInfo = @{ @"notification_id" : @"someID" }; notification.region = region; notification.alertBody = alertBody; [[UIApplication sharedApplication] scheduleLocalNotification:notification]; When a user enters the specified region, the notification is shown in the NotificationCenter correctly. However, I

问题 I face an issue where my app requires the users location when they receive a push notification while the app is running in the background. After doing a bit of reading I'm under the impression that this isn't possible, i.e: 1) App in background 2) Push notification received 3) Get users location and execute block of code. I found this post on here that suggests you can run a task every N amount of minutes to get the users location. So using this I could check say every ten minutes which would

问题 Hai I am trying to display multiple annotations in mkmap. While am adding the coordinates it shows the error:"Assigning to 'CLLocationCoordinate2D' from incompatible type 'id'". I know this is a simple prob, but I have searched many times and tried a lot but none works, my code is, for(int i=0 ; i<coordinates.count ; i++) { MKPointAnnotation *point = [[MKPointAnnotation alloc] init]; point.coordinate =[coordinates objectAtIndex:i]; //here it shows the error point.title = @"title"; [self

问题 I am using GPS in iphone and it show conformation message for use location service. and i want to trap what user select "Allow" or "No". can any one suggest how i do this? Thank 回答1: You don't get a direct callback from this alert. However, if the user does not allow Core Location usage, you'll receive a -locationManager:didFailWithError: with a kCLErrorDenied error to your CLLocationManagerDelegate . Since iOS 4.2, you can also listen to -locationManager:didChangeAuthorizationStatus: or

问题 In my app, if the user not allowed to access their current location, I can recieve that message in the following method - (void)locationManager:(CLLocationManager*)aManager didFailWithError:(NSError*)anError { switch([anError code]) { case kCLErrorLocationUnknown: break; case kCLErrorDenied: { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Access Denied" message:@"You didn't allow to access your current location" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert

问题 I'm developing an iOS app based on the map and location tracking. When the user first boots the app it asks for permission to track location etc. just fine. The only problem is while it's doing that, I have code setting up the initial map view and other location-based variables before the user has clicked OK. I've found I can put these initiation steps after a while loop that waits for the user to change the location manager's permissions as below but this can't possibly be best practice, not

问题 I have been unable to work out how to handle a scenario where the phone is already inside a region when startMonitoringForRegion is called? Other questions have suggested calling requestStateForRegion inside didStartMonitoringForRegion this then calls the method didDetermineState: forRegion: . So the code looks something like this: - (void)viewDidLoad { //location manager set up etc... for (Object *object in allObjects){ CLRegion *region = [self geofenceRegion:object]; [locationManager

问题 I just can get my CLLocationManager to authorise. (swift under ios8) I even add an explicit requestAlwaysAuthorization call (which I don't need with objC under ios7) func finishLaunch() { //ask for authorization let status = CLLocationManager.authorizationStatus() if(status == CLAuthorizationStatus.NotDetermined) { self.locationManager.requestAlwaysAuthorization(); } else { self.startMonitoring() } ... } the callback never gets anything but NotDermined and there is no UIAlertView shown to the

问题 What happens if I call startUpdatingLocation while startMonitoringSignificantLocationChanges is running? Does significantLocationChange monitoring get stopped? If I then stopUpdatingLocation will significantLocationChange monitoring continue or restart? I can find no documentation covering the interplay between these two ways of monitoring location. 回答1: They are not meant to be used concurrently. It's either or as they both deliver heading and location changes to the same delegate method.

问题 How do you check a CLLocation object and decide whether you want to use it or discard the result and get a new location update instead? I saw the timestamp property on CLLocation, but I'm not sure how to compare that to the current time. Also, after I do compare the time and find the difference in seconds, what value should the difference be under for me to use that CLLocation object? What's a good threshold. Thanks! 回答1: Is really important to check the timestamp, because iOS usually caches