[UIKit, Combine] UITextField, UITextView text 입력 받기

class SomeViewController: UIViewController {

    private let someTextView = UITextView()
    private let someTextField = UITextField()
    
    private let viewModel = ViewModel()
	
    override func viewDidLoad() {
    	super.viewDidLoad()
    	bind()
    }
	
    private func bind() {
    	someTextView.textPublisher
            .receive(on: RunLoop.main)
            .assign(to: &viewModel.$textViewInput)

		someTextField.textPublisher
            .receive(on: RunLoop.main)
            .assign(to: &viewModel.$textFieldInput)
    }
}

class ViewModel {
	@Published var textViewInput = ""
	@Published var textFieldInput = ""
}

import Combine

extension UITextField {
    
    var textPublisher: AnyPublisher<String, Never> {
        NotificationCenter.default.publisher(
            for: UITextField.textDidChangeNotification,
            object: self
        )
        .compactMap { $0.object as? UITextField }
        .map { $0.text ?? "" }
        .eraseToAnyPublisher()
    }
}

extension UITextView {
 
    var textPublisher: AnyPublisher<String, Never> {
        NotificationCenter.default.publisher(
            for: UITextView.textDidChangeNotification, object: self
        )
        .compactMap{ $0.object as? UITextView}
        .map{ $0.text ?? "" }
        .eraseToAnyPublisher()
     }
}