CODEWITHSUNDEEP
iospolling
Venu Gandhe
Venu Gandhe

Reputation: 77

IOS: Polling for every 2 sec

One feature of my application is to retrieve live data (JSON object) every 2 sec and display it (only while app is in foreground). I can't use push notification service because of server limitations. Could you please tell me effective way for polling in IOS?

Upvotes: 1

Views: 2560

Answers (2)

Daniel Martín
Daniel Martín

Reputation: 7845

Polling the network wastes battery, but one option may be a recurrent timer:

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self 
   selector:@selector(checkServer:) userInfo:nil repeats:YES];

Where you hit the network in your checkServer: function.

Upvotes: 6

pdrcabrod
pdrcabrod

Reputation: 1477

You can use a timer.

    poolingTimer = [NSTimer timerWithTimeInterval:pollingPeriod target:self selector:@selector(timerRanOut:) userInfo:nil repeats:YES];

And then in your timerRanOut method you can ask for the new json, parse it, and reload the views.

Upvotes: 1

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