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Questions tagged [nsnotification]

NSNotification is a class used to send messages to observing classes through NSNotificationCenter.

NSNotification is a class used to send messages to observing classes through NSNotificationCenter. Notifications must have a name and can be optionally associated with a specific object. If an object is provided, the notification is only delivered to a class that is also observing the exact same name and object.

To send a notification, use NSNotificationCenter's postNotification: (a convenience function postNotificationName:object:userInfo: also exists which creates a notification and posts it with a single call). Classes posting a notification can also include an optional userInfo parameter to pass an object to the receiving class.

For more information, see Apple's documentation for NSNotification and NSNotificationCenter.

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comparing NSUpdatedObjectsKey to NSString I get error: -[__NSSetI isEqualToString:]: unrecognized selector sent to instance

I'm trying to compare the string changes in core data. I add observer to NSArrayController and it working fine the problem is when I try to compare the string changes. Here is my code: - (void)mocDidChangeNotification:(NSNotification…
user2924482
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Passing extra data to NSTask output handler

I need to read the output of an NSTask. The code from this post achieves this:How to receive output of NSTask in Cocoa?. However, I want to pass in additional data to this function. I tried to create a dictionary and pass that in through the…
Nate
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Adding NSNotification Observer using swift

I was using this example which explains the use of NSNotification. In my case, I have a UIViewController in which I have a UITableView. To this tableview I am assigning a dataSource and delegate programatically by instatiating my…
rgamber
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iOS keyboardWasShown, NSNotification and Optional issue

Sometimes I feel so lost in the world of iOS code. It's telling me it's not unwrapped it should have a "!". When I fix it, it's telling me it's wrong and to delete the "!". So I keep going in a loop. I can't for the life of me figure out what is…
Lavvo
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Swift NSDate Comparison

I need to schedule a notification. If the date made from the current date date components with the dateFromData time components is early than the current day, I would like to change it to the next day. Here is what I have so far. The date…
Mike Miller
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Update UI of app upon launch from URL scheme using notifications

I've implemented a Notification Center Extension that provides a button to launch its containing app. Depending on the state of the widget I want to navigate to one of two different locations in the app when this button is pressed. I was able to…
Jordan H
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UIApplicationDidEnterBackgroundNotification delivered after entering foreground

I register my VC for UIApplicationDidEnterBackgroundNotification [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidEnterBackgroundNotification:) name:UIApplicationDidEnterBackgroundNotification…
Peter Lapisu
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iOS - How to reference Keyboard Notification outside of method?

I currently register for keyboardWillBeHidden and keyboardFrameDidChange methods to change the ScrollView size when the keyboard is open. In my textViewDidChange, I have a little text to make sure that cursor is in the view: if ([textView.text…
Eichhörnchen
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NSNotificationCenter selector method is not called

Hi i am trying to use NSNotification center in my application.The selector method is not being called from the code.I found similar questions in this site like this, but still i am unable to resolve the error. i am posting notification in…
srinivas
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iOS UITableView behaviour broken when not active

My current set up is the following: Root Tab Bar: Collection view with magazines Bookmarks (with a table view) Others You can add a bookmark from a magazine in the collection view and also remove it from there. The behaviour I'm seeing is the…
Iulian Arcus
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Notification not being recognised

I am trying to post a notification without much success! I can do it ok for the keyboard without issue but now am trying a custom one as follows: In my rootview I have this .h -(void) allowEdits:(NSNotification *)notification; .m //this section is…
user7865437
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Adding NSNotification cause app crash

I have two classes one is base class and the other is subclass. In the base class i am adding a notification that will be fired when the app goes to the background. But some how the app crashes after executing the handleAppBackground method. I guess…
Madu
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How to send a string along with NSNotification?

I'm trying to write a plugin for phonegap/cordova that allows audio to resume when interrupted by a phone call. I'm using AVAudioSesionInterruptionNotification and it is working well. However, I need to be able to send a string to my event handler,…
dadThrowsBolts
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Is there any way to find out where iOS app is downloaded, however never launched?

Is there any way to find out where iOS app is downloaded, however never launched? I am trying following things for that - 1. Send a notification, and on Didreceivenotification handler try to figure out how many didnt click on the notification / iOS…
Snehal Patil
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Handle NSNotification while scrolling a inner UITableView

I need some UIViewControllers that receive a NSNotification from the app delegate. It's like a timer, but every UIViewController handle your way. My problem is: when I interact with user interface, the UIViewController doesn't receive the…
marceloquinta
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