Better way to loop through array and reload data? - ios

Question

I'm trying to only display items that meet the criteria ( if location <= searchedDistance) but it seems like this is a very inefficient way to display this data. Does this function reload the entire tableview after each location is checked? If so, isn't this a horrible use of memory/time?
What's a better alternative?
var locations = [Int: Int]()
func searchSuccessful() {
var row: Int = 0
var section: Int = 0
for (index, location) in locations {
if location <= searchedDistance {
self.theTableView.beginUpdates()
let indexPath = NSIndexPath(forRow: row, inSection: section)
self.theTableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
self.theTableView.endUpdates()
}
}
}

Answer 1

Put the begin/end update outside of the loop.
self.theTableView.beginUpdates()
// Do all the changes in a single place, surrounded by begin/end updates
for (index, location) in locations {
if location <= searchedDistance {
let indexPath = NSIndexPath(forRow: row, inSection: section)
self.theTableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
}
}
self.theTableView.endUpdates()
Swift
self.tableView.beginUpdates()
let indexPath = NSIndexPath(forRow: row, inSection: section)
self.tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
self.tableView.endUpdates()
Obj-C
[self.tableView beginUpdates];
NSIndexPath * indexPath = [NSIndexPath indexPathForRow:row inSection:section];
[self.tableView reloadRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];