View와 Controller 분리

먼저 View파일을 생성해보자.
File -> New File -> Cocoa Touch Class

---

UIView를 상속받는 클래스로 생성해주자.

---

import UIKit

class CustomView: UIView {
   
   let testLabel: UILabel = {
       let label = UILabel()
       label.text = "View와 Controller 나누기"
       return label
   }()
   
   override init(frame: CGRect) {
       super.init(frame: frame)
       testLabel.translatesAutoresizingMaskIntoConstraints = false
	   self.addSubview(testLabel)
       testLabel.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
       testLabel.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
   }
   
   required init?(coder: NSCoder) {
       fatalError("init(coder:) has not been implemented")
   }
}

initializer를 작성해주고, 간단하게 UILabel을 추가해주었다.

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이제 ViewController로 이동해보자

import UIKit

class ViewController: UIViewController {

    var customView: CustomView!
    
    override func viewDidLoad() {
        super.viewDidLoad()

    }
    override func loadView() {
        super.loadView()
        customView = CustomView(frame: self.view.frame)
        self.view = customView
    }
}

만들어둔 CustomView를 받아오고 ViewController의 view를 교체해주면 끝!

추가 UIButton addTarget Controller 주기

view랑 controller를 분리해서 쓰다보니 UIButton addTarget 부분을 어떻게 해야할 지 모르겠어서 찾아봤다.

---

import UIKit

class CustomView: UIView {
   let testButton: UIButton = {
       let btn = UIButton()
       btn.setTitle("Click!", for: .normal)
       btn.backgroundColor = .systemBlue
       return btn
   }()
   
   override init(frame: CGRect) {
       super.init(frame: frame)
       testButton.translatesAutoresizingMaskIntoConstraints = false
       self.addSubview(testButton)
       testButton.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
       testButton.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
   }
   
   required init?(coder: NSCoder) {
       fatalError("init(coder:) has not been implemented")
   }
}

일단 CustomView에 UIButton을 추가해줬다.

---

import UIKit

class ViewController: UIViewController {

    var customView: CustomView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        customView.testButton.addTarget(self, action: #selector(buttonTapped) , for: .touchUpInside)
    }
    
    override func loadView() {
        super.loadView()
        customView = CustomView(frame: self.view.frame)
        self.view = customView
    }
    @objc
    func buttonTapped() {
        print("tapped!")
    }
}

다음 ViewController에서 customView에 접근해서 addTarget 해주면 된다.

끝!