cllocation

If I have a C-string like this: const char* str= "hello"; I know well that I can't change any character of the string because the pointer is const. But if I have this: - (CLLocationDistance)distanceFromLocation:(const CLLocation *)location I can still mutate the object state using it's methods. If the pointer is to a NSMutableString, I'm still able to mutate it. Then what does the const stand for? In that method declaration, location is a pointer to a constant CLLocation . But when you send a message to the location object, the const -ness is not preserved; the method that handles the message

I want to get the current location's address and set it to the annotation's title. But it didn't work. I think it's because of the block, but I don't know how to fix it. Any help will be appreciated. The most related code is as following: WhereAmIAnnotation.h #import <Foundation/Foundation.h> #import <MapKit/MapKit.h> @interface WhereAmIAnnotation : NSObject <MKAnnotation> { CLLocation *myLocation; NSString *addr; } @property (nonatomic, retain) CLLocation *myLocation; @property (nonatomic, copy) NSString *addr; @end WhereAmIAnnotation.m #import "WhereAmIAnnotation.h" @implementation

I'm developing my first iPhone application. I have to update a label with the device speed every x seconds. I have created my own CLController and I can get device speed but I don't know if I have got to use NSTimer to update my label. How can I do it? You can schedule the timer like this NSTimer *myTimer = [NSTimer scheduledTimerWithTimeInterval:YOUR_INTERVAL target:self selector:@selector(updateLabel) userInfo:nil repeats:YES]; Now below method will get called in every YOUR_INTERVAL (in seconds) periods - (void) updateLabel { myLabel.text = @"updated text"; } To stop the timer you could call

I have an array of CLLocation data that I would like to archive. Should the NSUserDefaults system be used? Otherwise, how best to archive the CLLocation data? UserDefaults can only store certain types of data, and should be used to store user preference information, not arbitrary application state data. To quote the Apple docs : The NSUserDefaults class provides a programmatic interface for interacting with the defaults system. The defaults system allows an application to customize its behavior to match a user’s preferences. For example, you can allow users to determine what units of

I'm trying to parse a location (CLLocation) into a String. func locationToString (currentLocation: CLLocation) -> String? { var whatToReturn: String? CLGeocoder().reverseGeocodeLocation(currentLocation, completionHandler: { (placemarks: [AnyObject]!, error: NSError!) in if error == nil && placemarks.count > 0 { let location = placemarks[0] as CLPlacemark whatToReturn = "\(location.locality) \(location.thoroughfare) \(location.subThoroughfare)" } }) return whatToReturn } Obviously, whatToReturn always returns null, because completionHandler runs in the background. I'm having a hard time

I am making one app on iphone sdk4.0.In that did update location method never called. I have given my code below.Please help.Thanks in advance. -(id)init { [super init]; obj=[[UIApplication sharedApplication]delegate]; locationManager = [[CLLocationManager alloc] init]; locationManager.delegate = self; //locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m [locationManager startUpdatingLocation]; return self; } -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *