Question

whats the best way to refresh data in a UITableView, lets say data is populated at start-up then this data changes, how could i refresh the data, every 30 seconds or give the option of the user to refresh the data.

i can populate data but unsure on how to update the data when it has been put in the UITableView.

Answer 1

Use timer NSTimer to update you UITabelView after each 30 second.

Use NSTimer

NSTimer* myTimer = [NSTimer scheduledTimerWithTimeInterval: 30.0 target: self
                                   selector: @selector(callAfterThirtySecond:) userInfo: nil repeats: YES];

After each 30.0 second , iOS will call the below function

Make isStopUdating as class member just like UITabelView instance : if you want to discontinue of updating table then set isStopUdating with YES,

-(void) callAfterThirtySecond:(NSTimer*) timer 
{

    if(isStopUdating)
    {
         [timer invalidate];
    } 
    [myTableView reloadData];

}