UITextView에서 placeholder구현하기

import UIKit


final class SourceTextViewController: UIViewController  {
    private let placeholderText = "텍스트를 입력해주세요"
    private lazy var textView: UITextView = {
        let textView = UITextView()
        textView.text = placeholderText
        textView.textColor = .secondaryLabel
        textView.font = .systemFont(ofSize: 16, weight: .semibold)
        textView.returnKeyType = .done
        textView.delegate = self
        return textView
    }()

    

    override func viewDidLoad() {
        super.viewDidLoad()   
        
        view.backgroundColor = .systemBackground
        view.addSubview(textView)

        textView.snp.makeConstraints {
            $0.edges.equalToSuperview().inset(16)
        }
    }
}

extension SourceTextViewController: UITextViewDelegate {
    func textViewDidBeginEditing(_ textView: UITextView) {
        guard textView.textColor == .secondaryLabel else { return }//텍스트 컬러가 세컨더리라벨컬러가 아니면 리턴 그냥 라벨이면 맞으면 아래 라인..
        textView.text = nil
        textView.textColor = .label
    }
}