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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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NSNotification delay from class A to class B

My NSNotification is delayed. In myVC, I have two buttons, buttonA and buttonB. Each one is linked to their respective pdfs, pdfA and pdfB. There is a button Push, which is pressed after A or B is pressed. Push brings the user to the RVC where…
user3325170
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postNotificationName exc bad access

I'm receiving a lot of crash log for postNotificationName: What I'm doing is that I register for notification on viewdidappear and removeObserver on viewdiddisappear. Most of them are crashing just after sendDelegateAnimationDidStop, what calls…
user774150
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reload tableView in last method run

I have method that get notification as I download one image. I can download a lot of objects and I want to update tableView then I have last notification of downloaded image. How the best way to accomplish it? -…
user3587674
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ALAssetLibrary Notification and enumerateAssetsUsingBlock

I'm building an iOS app that allows a user to take a picture and save it to a custom album, which populates a UICollectionView in the app with the photos from the album. I found plenty of examples on the web on how to do this, but I could NOT get…
Brian
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NSNotificationCenter to post a C structure and retrieve it back from the notification callback function

I have a complex C structure and it's hard to convert this structure to NSDictionary one by one. How do I post this C structure via NSNotificationCenter and retrieve it back from the NSNotificationCenter callback function? Any suggestion will be…
srjohnhuang
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Fetch request returns old data

I'm getting outdated results when executing a fetch request upon a NSManagedObjectContextObjectsDidChangeNotification. As an example, consider directories with documents that can be deleted logically with a boolean attribute (softDeleted). The…
hpique
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NSTableViewDelegate receiving multiple NSNotifications

I have a view-based NSTableView whose data is supplied by a subclass of NSArrayController. The array controller also receives NSNotifications (just 2) from other objects telling it to update. As long as the array controller is not acting as a…
Joel
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Child UITableViewController can't receive notification from Parent UITableViewController?

As the question states, I am sending a notification to a child TVC and that child TVC is unable to receive the notification and excute the selector handleNotification: (NSNotification *) paramNotif. I.e. I do not get the NSLog output from that…
Cescy
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Why using NSNotification argument

Here is the code in main.m [[NSNotificationCenter defaultCenter]addObserver:logger selector:@selector(zoneChange:) name:NSSystemTimeZoneDidChangeNotification object:nil]; here is the code in .h file -(void)zoneChange:(NSNotification *)note; Can…
user3090658
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How to document NSNotifications properly with headerdoc?

The documentation for UIApplication contains a section Notification where all related NSNotifications are listed. Unfortunately, the header files available in Xcode don't contain the corresponding comments. The HeaderDoc User Guide shows how the…
Etan
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Call method in other viewcontroller by notification when view appears

I have two ViewControllers. Let's call them aVC and bVC. In aVC, I show an alertView. If you press a Button on that alertView, a segue is performed to bVC. In bVC, something should happen when the view appears but only when triggered from that…
irie
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Dispatch table for NSNotifications cleared for no reason.

I am dispatching notification from my facade class which hides the complexity of the model from my viewcontrollers. Now, I have a simple tab barcontroller with a navigation controller on the first tab. So far so good, a very typical design. Now…
Earl Grey
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Class initialitation, notifications

I have classes: loginViewController, helloViewController, howAreYouViewController. I also have a class ActionsViewController. The first 3 classes are initialized when it is appropriative. I want to call some methods from ActionsViewController (but…
user3290318
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UIWebView/MPMoviePlayerController and the "Done" button

I am using the UIWebView to load both streaming audio and video. I have properly set up the UIWebView delegate and I am receiving webViewDidStartLoading and webViewFinishedLoading events perfectly. The webview launches a full screen window (likely a…
David Sowsy
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iOS is there a better alternative to notification-based code?

I'm in process of implementing "new game" functionality for one of my apps and ran into an issue where occasionally my code crashes because a notification is sent to a deallocated object. There are just a couple places where the notifications are…
Alex Stone
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