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In my application there is two viewControllers as FirstViewController and DetailViewController.
When tap on a table cell, it navigate to DetailViewController. In DetailViewController, I want to edit and reload the FirstViewController's table view
How can I use NSNotification for this problem?
Here's the method I want to implement NSNotification stuff
-(IBAction) save{
strSelectedText=theTextField.text;
[NSNotificationCenter defaultCenter];
NSNotification* notification = [NSNotification notificationWithName:@"MyNotification" object:self];
[[NSNotificationCenter defaultCenter] postNotification:notification];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector (objFirstViewController) name:@"MyNotification" object:nil];
[self.navigationController popViewControllerAnimated:YES];
}
932
A notification dispatch mechanism that enables the broadcast of information to registered observers. iOS 2.0+ iPadOS 2.0+ macOS 10.0+ Mac Catalyst 13.0+ tvOS 9.0+ watchOS 2.0+
Let's see how to use it - Based on the key NotificationCenter can observe. NotificationCenter. default — This is the notification variable you can create it globally inside your class if you having more notifications. addObserver(self, — This is for the class where we are going to observer notification.
First, register an observer for a notification with: addObserver(_:selector:name:object:) Then, post a notification with post(name:object:userInfo:) … … after which your selector is called. And don't forget to remove the observer with removeObserver()
-(void)viewDidLoad {
[NSNotificationCenter defaultCenter];
NSNotification* notification = [NSNotification notificationWithName:@"MyNotification" object:self];
[[NSNotificationCenter defaultCenter] postNotification:notification];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector (objFirstViewController) name:@"MyNotification" object:nil];
}
-(IBAction) save{
[[NSNotificationCenter defaultCenter] postNotificationName:MyNotification object:sender];
//this will go to where you implement your selector objFirstViewController.
}
-(void)objFirstViewController:(NSNotification *)notification {
}
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