NSNotification with delay

Question

How to post NSNotification with delay.

One solution that is in my mind :- post notification in performSelectorAfterDelay method. Is there any better solution for this.

Is NSNotificationQueue can help me to achieve this ?

see this link may be helps you http://stackoverflow.com/questions/17171352/calling-method-with-delay-in-main-thread — Anbu.Karthik, Feb 18 '16 at 06:46

ZeMoon · Accepted Answer · 2017-03-25T06:33:10.387

13

Make use of GCD's dispatch_after() method. In Objective-C, this would look like:

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    [[NSNotificationCenter defaultCenter] postNotification:someNotification];
});

Update: Swift 3

DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + .seconds(5)) { 
    NotificationCenter.default.post(someNotification)
}

edited Mar 25 '17 at 06:33

answered Feb 18 '16 at 06:45

ZeMoon

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Right said. We must use GCD in swift rather than performSelector. Thanks for advice. – pkc456 Feb 19 '16 at 06:30

score 0 · Answer 2 · answered Feb 18 '16 at 09:59

You can also use NSLocalNotification and set a fireDate. The main difference is that with NSLocalNotification, the user will see the notification when the app is in background ( like it is a RemoteNotification).

It could be useful if you notification is a Reminder or that kind of thing.

NSNotification with delay

2 Answers2