Question

Programmaticaly how can we close or hide drop down list when clicked outside in iphone?

-(void)RecommendDropDownSelect
{
dropDown=[[DropDownView alloc]initWithArrayData:arr_RecommendName  cellHeight:30 heightTableView:100 paddingTop:-100 paddingLeft:10 paddingRight:20 refView:txt_Recommend animation:BLENDIN openAnimationDuration:0.5 closeAnimationDuration:0.5];
dropDown.delegate=self;
[scr_View addSubview:dropDown.view];
[dropDown openAnimation];


btn_RecommendDropDown.enabled=NO;
}

-(void)dropDownCellSelected:(NSInteger)returnIndex
{
btn_RecommendDropDown.enabled=YES;
txt_Recommend.text=[arr_RecommendName objectAtIndex:returnIndex];

}

Answer 1

Besides subclassing UIView and override touchesBegan, using UITapGestureRecognizer seems to be easier if you are using UIViewController

First, setup a tap gesture for your view:

UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideDropDown)];
[gestureRecognizer setCancelsTouchesInView:NO];
[self.view addGestureRecognizer:gestureRecognizer];

then implement the method for hiding the dropdown:

- (void)hideDropDown
{
    if ((dropDown != nil) && (dropDown.view != nil))
    {
        [drdropDown.view removeFromSuperview];
    }
}