Animate a Table View as Dropdown in iOS

m File:

-(void)viewDidLoad

{

CGRect rect = CGRectMake(lbl_txt.frame.origin.x, lbl_txt.frame.origin.y+40, lbl_txt.frame.size.width, 0);

    [tbl_Cities setFrame:rect];

}

-(IBAction)clicked_cities:(id)sender

{

CGRect rect = CGRectMake(lbl_Selected_City.frame.origin.x, lbl_Selected_City.frame.origin.y+40, lbl_Selected_City.frame.size.width, 250);

    [UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:0.5];

[tbl_Cities setFrame:rect];

[UIView commitAnimations];

}