# HMSegmentedControl react to tapping on currently selected segment

I'm using HMSegmentedControl, an open-source UISegmentedControl subclass. I'm trying to react to the user tapping on the currently selected segment. HMSegmentedControl only supports reacting to a segment CHANGE, with either UIControlEventValueChanged or a block that executes when the index is changed. I need to react to the currently selected segment in order to present a drop-down menu. Here is what I've done so far:

-(void)segmentedControlValueChanged:(HMSegmentedControl *)control {
CGFloat midX = self.view.frame.size.width / 2 - _filterView.frame.size.width / 2;
_filterView.frame = CGRectMake(midX, -_filterView.frame.size.height+64, _filterView.frame.size.width, _filterView.frame.size.height);
_filterView.hidden = YES;

_filterBackgroundView.alpha = 0.0f;
_filterBackgroundView.hidden = YES;
}

-(void)segmentedControlTouchUpInside:(UIGestureRecognizer *)gr {

if(!_filterView) {
_filterView = (HomeFilterView *)[[NSBundle mainBundle] loadNibNamed:@"HomeFilterView" owner:self options:nil].firstObject;
CGFloat midX = self.view.frame.size.width / 2 - _filterView.frame.size.width / 2;
_filterView.frame = CGRectMake(midX, -_filterView.frame.size.height+64, _filterView.frame.size.width, _filterView.frame.size.height);
_filterView.delegate = self;
[self.view insertSubview:_filterView belowSubview:self.segmentedControl];
}

if(!_filterBackgroundView) {

_filterBackgroundView = [[UIView alloc] initWithFrame:self.view.bounds];
_filterBackgroundView.backgroundColor = [UIColor blackColor];
_filterBackgroundView.alpha = 0.0f;
[self.view insertSubview:_filterBackgroundView belowSubview:_filterView];
}

_filterView.hidden = NO;
_filterBackgroundView.hidden = NO;

[UIView animateWithDuration:0.5f delay:0.0f usingSpringWithDamping:0.55f initialSpringVelocity:0.0f options:UIViewAnimationOptionCurveLinear animations:^{

CGFloat midX = self.view.frame.size.width / 2 - _filterView.frame.size.width / 2;
CGFloat y = self.segmentedControl.frame.size.height + self.segmentedControl.frame.origin.y;
_filterView.frame = CGRectMake(midX, y-70, _filterView.frame.size.width, _filterView.frame.size.height);

} completion:^(BOOL finished) {

}];

[UIView animateWithDuration:0.25f animations:^{

_filterBackgroundView.alpha = 0.5f;

} completion:^(BOOL finished) {

}];
}


I added a tap gesture recognizer to the segmented control. So, if a user selects the current segment, only segmentedControlTouchUpInside: will be fired. If a user selected a different segment, segmentedControlTouchUpInside: is fired, followed by segmentedControlValueChanged:. I'm relying on the segmentedControlValueChanged: method to be called after the gesture-recognizer method, and essentially "undo" the adding of the drop-down to the UI.

This is the only way I could figure out to handle the tapping of the current segment. It seems to accomplish what I'm going for in the UI, but can anyone think of a better way of doing this? Is this safe to do?

In touchesEnded:withEvent:, you need to modify this line so it wouldn't check if the tapped segment is the currently selected segment:
    if (segment < sectionsCount)