NSArray *elementsArray ... // Tha element will be picked by PickerController
// Allocate and Initialize

NNPickerController *picker = [[NNPickerController alloc] init];

// Picker's cancel button was clicked handler;
picker.cancelHandler = ^(NNPickerController *picker) {
    [picker dismissPickerController];
};

// Element was picked handler
picker.finishPickingHandler = ^(NNPickerController *picker, UITableView *tableView,NSIndexPath *indexPath){
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    self.elementLabel.text = elementsArray[indexPath.row];
    [picker dismissPickerController];
};

// Configuration for Picker Controller
[picker setNumberOfSection:^NSInteger{
    return 1;
} withNumberOfRow:^NSInteger(NSInteger section) {
    return elementsArray.count;
} withCellForRowAtIndexPath:^UITableViewCell *(UITableView *tableView, NSIndexPath *indexPath) {
    NSString *cellIdentifier = [NSString stringWithFormat:@"cell%@/%@", @(indexPath.row),@(indexPath.section)];
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell != nil) {
        return cell;
    }
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
    cell.textLabel.text = elementsArray[indexPath.row];
    if (indexPath.row == 0) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    return cell;
}];

// show picker controller
[picker showPickerControllerForViewController];