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Questions tagged [nsnotificationcenter]

NSNotificationCenter allows to send and register for notifications in the Foundation framework, which is provided by Apple.

An NSNotificationCenter object (or simply, notification center) provides a mechanism for broadcasting information within a program. An NSNotificationCenter object is essentially a notification dispatch table. Notifications are differentiated according to their name and contain an object (the sender) as well as any specific data.

Objects register with a notification center to receive notifications (NSNotification objects) using the addObserver:selector:name:object: or addObserverForName:object:queue:usingBlock: methods. Each invocation of this method specifies a set of notifications. Therefore, objects may register as observers of different notification sets by calling these methods several times.

You can also post notifications with postNotification:, or create and post notifications with postNotificationName:object: and postNotificationName:object:userInfo:, where you may use custom names for your notifications.

References:

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NSnotification center not working iOS

Last week I asked this question: Refresh the entire iOS app @Jim advised me to use the notification center. I was not able to figure out how to work with notifications and I was told to ask another question, I tried for the full week to figure it…
user1396737
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"Delegates or NSNotifications" Adjudging performance of code?

In my application, I have to display image files as a list in tableview, present them in full size and as multiple thumbnails. Hence basically I developed three seperate classes to handle these three views. Now to perform any file operations, I can…
tech savvy
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how to post notification in Logos Tweak

I used the iOSOpenDev to create a Logos Tweak to hook the acknowledgeIncomingMessageWithId: of CTMessageCenter and I want to send notification by NSNotificationCenter to another app, but it doesn't work. I think that the NSNotificationCenter can…
Piosa
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UITextFieldTextDidEndEditingNotification not working properly in TableVIew

I have a tableView in which I use an instance of a custom TableViewCell. In each custom cell, there's a textfield and a label. Each time the text on the textField changes, I need to do some update in another textField present on the main UIView of…
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Why can't I rely on NSNotificationCenter using AVFoundation to loop video?

I loop my video played with AVFoundation video with the help of NSNotificationCenter and playerItemDidReachEnd: AVURLAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil]; self.playerItem = [AVPlayerItem playerItemWithAsset:asset]; …
headkit
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Updating a UILabel from another view using NSNotificationCenter

I'm updating a UILabel in another view using a method invoked using the NSNotification center. What I'm finding is that it's not working, the label remains unchanged until the view is reloaded at a later point (not using the method called by…
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send application delegate message to current view without notification center

I want to display application delegate message such as "Application became active" (This is called when -applicationDidBecomeActive:application is called) on Window. One way is to use notification center like below: AppDelegate.m NSNotification *n…
Feel Physics
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Is there a way to access the notifications shown in the notification center?

I have kind of to-do local notifications that are fired OK. So for example if 2 notifications have fired the badge number goes to 2. Now I like to handle these notifictaions also when the user just starts the app directly - not via the notifictaion…
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What's the meaning of this piece of code?

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(requestAddressUpdatedNotification:) name:MTAddressUpdatedNotification …
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What happens when a nsnotification is sent to an inactive viewcontroller?

In my applicationWillEnterForeground, I check and send a notification if data refresh is necessary: [[NSNotificationCenter defaultCenter] postNotificationName:@"refreshModelNotification" object:nil]; The only observer for that particular…
Steven
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No orientation-related notifications are being fired. Why?

I want to be notified when the orientation of the device changes. I've setup a test method that's suppose to receive the notification. I'm trying several different observers to achieve that, and none of them are working. Why isn't testMethod being…
zakdances
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How to move view up when a UIPickerView is displayed

I have a mainview with all of my textfields and buttons. For my textfields i am using the inputView to display UIPickerViews instead of the keyboards. I am wondering how I can main the view move up when a textfield is selected that way the picker…
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Creating my own NSNotificationCenter, storing objects?

I'm trying to create my own NSNotificationCenter just to get better at programming. I am running into an EXC_BAD_ACCESS that I can't quite work out. My method: - (void)addObserver:(id)observer forKey:(NSString *)theKey withSelector:(SEL)block { …
Zaid Daghestani
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NSNotificationCenter get notifications on NSMutableDictionary addObject

How can I get notifications with NSNotificationCenter when object is added to NSMutableDictionary? Also are there any notifications for immutable NSDictionary?
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Must I use a delegate to have information transfer back to the mainViewController?

I have a scoreboard app that has many UITextFields that holds the scores for each player of every round. When clicking on the text field, instead of just using the keyboard to input a score, I want to create another viewController (a popover or a…
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