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This is an easy to use drop down implementation for iOS. You basically have to instantiate the trends table view and add it as a subview.

NSMutableArray *arr = [[NSMutableArray alloc] init];
for (int i=0; i<10; i++) {
    RDTrendObject *trendObject = [[RDTrendObject alloc] init];
    [trendObject setSelected:NO];
    [trendObject setName:[NSString stringWithFormat:@"index %d", i]];
    [arr addObject:trendObject];
}

trendTableView = [[RDTrendsTableView alloc] initWithTrends:arr];
[trendTableView setFrame:CGRectMake(0, 100, self.view.frame.size.width-40, 0)];
[trendTableView setCenter:CGPointMake(self.view.center.x, trendTableView.center.y)];
[self.view addSubview:trendTableView];

Also I have added a ORM called trend object to store your settings. Basically this needs to be set too.