nsnotificationcenter

Can listening to AVSystemController_SystemVolumeDidChangeNotification NSNotification be considered (during the App Store review process) as using private API? In my application I need to display and update the current volume level. Volume indicator should be updated after pressing hardware volume buttons and after volume change in MPVolumeView slider. I've searched solution how to get notification or event of hardware volume button press and had found a number of solutions. For example, iPhone Detect Volume Keys press. and How to get audio volume level, and volume changed notifications on iOS?

I am either brain damaged or I am lacking of some understending of NSNotificationCenter The problem is that if I create an observer and in the next line will try to delete it like so: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(removeAllVisibleMapViews) name:@"ClearVisibleMaps" object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self forKeyPath:@"ClearVisibleMaps"]; I get *** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <MyApp 0x592db70> for the key path "ClearVisibleMaps" from <NSNotificationCenter

How can I check whether the app is connected to the internet or not? currently, I am using this code in my appdelegate.m file dispatch_queue_t connectivityThread = dispatch_queue_create("com.gm.kart.connectivity", NULL); dispatch_async(connectivityThread, ^{ while (true){ if([GMMConnectivity hasConnectivity]) NSLog(@"%@", @"connected"); else NSLog(@"Not connected"); usleep(10000000); } }); and when I click my login button I want to do a check whether the internet is connected or not using NSnotificationcenter ? Please help me After download bellow example. http://developer.apple.com/iphone

I want to update user location in ALL views, after the locateButton in the navbar is pressed in ANY view. I've started by creating a singleton. Location.h #import <Foundation/Foundation.h> #import <CoreLocation/CoreLocation.h> #import <MapKit/MapKit.h> @interface Location : NSObject <CLLocationManagerDelegate> @property (nonatomic, strong) CLLocationManager* locationManager; + (Location*)sharedSingleton; @end Location.m #import "Location.h" @implementation Location { CLLocationManager *locationManager; CLGeocoder *geocoder; CLPlacemark *placemark; } @synthesize locationManager; - (id)init {

I want to add a accessoryView on a keyboard called from a UISearchBar. Since UISearchBar does not implement this property, I've just created a toolBar. Following Apple's documentation on the matter, I've decided to use notification center not only to know when the keyboard is called but also to know the size of the keyboard, which changes depending on the orientation. I've followed the example on the documentation and, on the keyboardWasShown method, I call an animation which will show the toolBar on top of the keyboard. Something like this: -(void)keyboardWasShown:(NSNotification*

Can I post a notification in a given queue and receive it on another? I want to use notifications to communicate different queues, but I'm not sure if this is safe... No. Notifications are delivered in the same thread that they are sent from, this you will need to re-send it in some way to get the notification to your thread. No. Apple's docs on the subject say: " Regular notification centers deliver notifications on the thread in which the notification was posted. [...] At times, you may require notifications to be delivered on a particular thread that is determined by you instead of the

I have a few notifications that were created using block / trailing closure syntax which look like this: NotificationCenter.default.addObserver(forName: .NSManagedObjectContextObjectsDidChange, object: moc, queue: nil) { note in // implementation } Which I was later removing by name, like this: NotificationCenter.default.removeObserver(self, name: NSNotification.Name.NSManagedObjectContextObjectsDidChange, object: moc) My Question Is this adequate? Or do I absolutely need to save the NSObjectProtocol to it's own property and remove that property with the following syntax? NotificationCenter

I've got a UITableView. Here I got different cell's. Each cell has a model. With KVO and NotificationCenter the cell listen to the model for changes. When I leave the ViewController I get this error: An instance 0x109564200 of class Model was deallocated while key value observers were still registered with it. Observation info was leaked, and may even become mistakenly attached to some other object. Set a breakpoint on NSKVODeallocateBreak to stop here in the debugger. Here's the current observation info: <NSKeyValueObservationInfo 0x109429cc0> ( <NSKeyValueObservance 0x109429c50: Observer: