CODEWITHSUNDEEP
objective-cevent-listener
iphonedev7
iphonedev7

Reputation: 295

specific event listeners objective-c

I am developing an iPhone app (in Objective-C), and I am trying to make it so that there is some sort of 'action listener' that is constantly checking to see if the current date and time match that of the first object in a NSMutableArray filled with event objects (retrieved from the users calendar).

My problem is that I cannot figure out how to do so, while the rest of my code continues to run, because right now I have a for loop running to constantly check, which stops my code, and prevents the app from continuing to run. If anyone knows any sort of tutorials, or has an explanation, I would greatly appreciate it.

Thanks!

Upvotes: 0

Views: 468

Answers (3)

MechEthan
MechEthan

Reputation: 5703

You could use an NSTimer EDIT: see phix23's answer for a more reliable "fireDate" code for use with iOS.

Apple Documentation: NSTimer

Upvotes: 0

J2theC
J2theC

Reputation: 4452

get the time between the current time and the event time, and use dispatch_after

dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, timeDifference * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    //Your code
});

Upvotes: 0

Felix
Felix

Reputation: 35394

Setup a NSTimer to fire at the desired date. This NSTimer category here is useful for this purpose: https://github.com/adamjernst/NSTimer-AbsoluteFireDate

You can also try to create and schedule a UILocalNotification to get notified at a specific date.

Upvotes: 1

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