How to throttle search (based on typing speed) in iOS UISearchBar?

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Try this magic:

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
    // to limit network activity, reload half a second after last key press.
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(reload) object:nil];
    [self performSelector:@selector(reload) withObject:nil afterDelay:0.5];
}

Swift version:

 func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
    // to limit network activity, reload half a second after last key press.
      NSObject.cancelPreviousPerformRequestsWithTarget(self, selector: "reload", object: nil)
      self.performSelector("reload", withObject: nil, afterDelay: 0.5)
 }

Note this example calls a method called reload but you can make it call whatever method you like!

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