problems at nested hierarchy view using storyboard in Swift

Question

I'm beginner at Swift, so currently i organize most part of my app using storyboard.

I want to construct some view scrollable that contains textField and pickerView.

and each of them is stacked View, and then it is child view of view A. and view A is child view of scrollView.

help you to understand more, i'll attach my app structure.

Anyway, when i run my apps, it represent well i want to achieve, however, coudn't get any touch reaction.

keyboard isn't popup when i touch textField, pickerView scroll isn't working. I think it's because of nested view, but have no idea how to solve.

plz help! And also glad give some advice learn Swift. Thx in advance.

* edit 1) attach my code *

import UIKit

class ViewController: 
UIViewController, UIPickerViewDataSource, UIPickerViewDelegate
{
    @IBOutlet var outerView: UIView!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var statePicker: UIPickerView!

    @IBOutlet weak var innerView: UIView!
    @IBOutlet weak var nameInputer: UITextField!

    let states = ["Alaska", "Arkansas", "Alabama", "California", "Maine", "New York"]

    override func viewDidLoad() {
        super.viewDidLoad()

        var scrollViewHeight:CGFloat = 0.0
        for view in self.view.subviews as [UIView] {
            scrollViewHeight += view.frame.size.height;
        }

        scrollView.contentSize = CGSize(width: view.frame.width, height: scrollViewHeight)
        scrollView.contentInset = UIEdgeInsetsMake(20, 0, 20, 0)

        statePicker.dataSource = self
        statePicker.delegate = self

        statePicker.isExclusiveTouch = true
        scrollView.canCancelContentTouches = false

        innerView.sendSubview(toBack: outerView)

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return states.count
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return states[row]
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        statePicker.isHidden = true
    }
}

* EDIT 2 : attach my story board *