SearchTextField itemSelectionHandler is not working

I am using this cocoapod for iOS swift 3 i.e v(1.0.2). I have used this pod for my project and it works well when I use it in my self made modal, but when I try to use it in a normal view in my app, it does not seem to work at all. What is going on here?

This is the example of my self made modal using the autocomplete feature. On choosing from the list you can see that a couple of tags are added Code for the modal view :

breedSearchTextField = SearchTextField()
breedSearchTextField.itemSelectionHandler = { (item) in
            if !self.selectedBreeds.contains(item.title) {
                self.selectedBreeds.append(item.title)
                var tag = self.breedListView.addTag(item.title)
                tag.backgroundColor = UIColor(red: 235/255, green: 235/255, blue: 235/255, alpha: 1)
                tag.enableRemoveButton = true
                self.dialogView.frame.size = CGSize(width: self.frame.width-50, height: self.dialogView.frame.height+17.5)
            }
        }

I am trying to do the same for normal views. But nothing is happening. The item selection handler is not responding at all code for normal view :

breedSearchTextField = SearchTextField()
        breedSearchTextField.itemSelectionHandler = { (item) in
            print("The selected breed is \(item.title)")
            self.chosenBreed = item.title
        }