RxSwift basic test (count 1씩 올리기)

 

with RxSwift

import UIKit
import Then
import RxSwift
import RxCocoa

class ViewController: UIViewController {

    private var count = BehaviorSubject(value: 0)
    private let bag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupBindings()
        
        setupLayout()
    }
    
    private func setupBindings() {
        
        btn.rx.tap
            .subscribe(onNext: { [weak self] _ in
                guard let self = self else { return }
                print("btn tapped!")
                do {
                    let value = try self.count.value()
                    self.count.on(.next(value + 1))
                } catch let error {
                    print(error.localizedDescription)
                }
            }).disposed(by: bag)
        
        count
            .subscribe(onNext: { [weak self] num in
                guard let self = self else { return }
                DispatchQueue.main.async {
                    self.countLabel.text = String(num)
                }
            })
            .disposed(by: bag)
    }
    
    private let btn = UIButton().then {
        $0.backgroundColor = .gray
        $0.setTitle("Tap Me", for: .normal)
    }

    private let countLabel = UILabel().then {
        $0.textColor = .gray
    }
}

 

Vanila Swift

import UIKit
import Then
import RxSwift
import RxCocoa

class ViewController: UIViewController {

    private var count = 0

    private let bag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupAddTargets()
        
        setupLayout()
    }
    
    private func setupLayout() {
        
        [countLabel, btn].forEach { self.view.addSubview($0)}
        
        countLabel.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.height.width.equalTo(40)
        }
        
        btn.snp.makeConstraints { make in
            make.top.equalTo(countLabel.snp.bottom).offset(100)
            make.width.lessThanOrEqualTo(view.snp.width).offset(-30)
            make.height.equalTo(40)
        }
    }
    
    private func setupAddTargets() {
        btn.addTarget(self, action: #selector(btnTapped), for: .touchUpInside)
    }
    
    @objc func btnTapped() {
        count += 1
        countLabel.text = String(count)
    }
    
    private let btn = UIButton().then {
        $0.backgroundColor = .gray
        $0.setTitle("Tap Me", for: .normal)
    }

    private let countLabel = UILabel().then {
        $0.textColor = .gray
    }
}