【Xcode/Swift】同じパーツなら一つのコードで管理すればいいじゃないか (Outlet Collection)

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var label: UILabel!
    @IBOutlet weak var firstButton: UIButton!
    @IBOutlet weak var secondButton: UIButton!
    @IBOutlet weak var thirdButton: UIButton!
    @IBOutlet weak var forthButton: UIButton!
    @IBOutlet weak var fifthButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupView()
    }
    
    private func setupView() {
        firstButton.layer.cornerRadius = 20.0
        secondButton.layer.cornerRadius = 20.0
        thirdButton.layer.cornerRadius = 20.0
        forthButton.layer.cornerRadius = 20.0
        fifthButton.layer.cornerRadius = 20.0
    }
    
    @IBAction func firstAction(_ sender: Any) {
        label.text = "こんにちは"
    }
    
    @IBAction func secondAction(_ sender: Any) {
        label.text = "Hello"
    }
    
    @IBAction func thirdAction(_ sender: Any) {
        label.text = "Bonjour"
    }
    
    @IBAction func forthAction(_ sender: Any) {
        label.text = "Hola"
    }
    
    @IBAction func fifthAction(_ sender: Any) {
        label.text = "你好"
    }
    
}

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var label: UILabel!
    @IBOutlet var button: [UIButton]!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupView()
    }
    
    private func setupView() {
        //ボタンを角丸にする
        button.forEach({ $0.layer.cornerRadius = 20.0 })
    }
    
    //ボタンが押された時のアクション
    @IBAction func buttonAction(_ sender: UIButton) {
        //タグを使ってどのボタンが押されたか判定を行う
        switch sender.tag {
        case 1:
            label.text = "こんにちは"
        case 2:
            label.text = "Hello"
        case 3:
            label.text = "Bonjour"
        case 4:
            label.text = "Hola"
        case 5:
            label.text = "你好"
        default:
            break
        }
    }
    
}