XCode、Swift：ButtonとPickerViewの選択に合わせて画像を表示したい

import UIKit


class ViewController: UIViewController,UIPickerViewDelegate,UIPickerViewDataSource {
    //Storyboardとの設定・紐付け

    @IBOutlet weak var ImageView: UIImageView!

    @IBOutlet var pickerview: UIPickerView!

    @IBOutlet var Button01: UIButton!
    @IBOutlet var Button02: UIButton!
    @IBOutlet var Button03: UIButton!

    //imageList(画像名の割当)
    let imageList = [["1","2","3"],["maru","shikaku"]]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    //UIPickerViewの列の数を返す
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return imageList.count
     }

    //UIPickerViewの行数、リストの数を返す
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
        return imageList[component].count
    }

    //UIPickerViewの画面での表示を指定する
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?{
        return imageList[component][row]
    }  

    //画像を表示するfunc
    func view_image(file_image: String){
        let  file_image2 = "\(imageList[pickerview.selectedRow(inComponent:0)]).png"
        ImageView.image = UIImage(named: "\(file_image)\(file_image2)")
    }

    //Buttonが押されたときのAction

    @IBAction func tapButton01(_ sender: Any){
        let file_image = "iruka-"
        view_image(file_image: file_image)
    }
    @IBAction func tapButton02(_ sender: Any){
        let file_image = "inu-"
        view_image(file_image: file_image)
    }

    @IBAction func tapButton03(_ sender: Any) {
        let file_image = "neko-"
        view_image(file_image: file_image)
    }

    //UIPickerViewが選択されたときの動作
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){

        view_image(file_image: file_image)
    }



    override func didReceiveMemoryWarning() {
        super.viewDidLoad()
    }


}