ToDo App

Stack: Swift, UIKit, Combine, Firebase

This tasks application made with Swift, using UIKit, Combine, and Firebase. Also I used some open sorce libraries: MBProgressHUD, Loaf, and FSCalendar. There are two main screens with Outgoing and Done tasks. User can move tasks from Done to Outgoing, delete and edit tasks. User doen't have to log in every time when launch the application.

Combine framework

Combine is Apple's shiny reactive framework that provides a declarative Swift API for processing values over time. For example I used it to observe the New Task Form: if form is not empty save button becomes active, and if user set a deadline for the task it appears at the form as well.

    private func observeForm() {
        NotificationCenter.default.publisher(for: UITextField.textDidChangeNotification)
            .map({
                ($0.object as? UITextField)?.text
        }).sink { [unowned self] (text) in
            self.taskString = text
        }.store(in: &subscribers)
        
        $taskString.sink { [unowned self] (text) in
            self.saveButton.isEnabled = text?.isEmpty == false
        }.store(in: &subscribers)
        
        $deadline.sink { (date) in
            self.deadlineLabel.text = date?.toString() ?? ""
        }.store(in: &subscribers)
    }

Also I used Combine on the Login screen to update error message and check if user succsessfully loged in and transfer to main screen of the application.

private func observeForm() {
        $errorString.sink { [unowned self] (errorMessage) in
            self.errorLabel.text = errorMessage
        }.store(in: &subscribers)
        
        $isLoginSuccessfull.sink { [unowned self] (isLogin) in
            if isLogin {
                self.delegate?.didLogin()
            }
        }.store(in: &subscribers)
    }

Animation

I created protocol called Animatable with implementation of animation functions for toasts and progress indicator. For toasts I use Loaf:

func showToast(state: Loaf.State, text: String, location: Loaf.Location = .top, duration: TimeInterval = 2.0) {
        DispatchQueue.main.async {
            Loaf(text,
                 state: state,
                 location: location,
                 presentingDirection: .vertical,
                 dismissingDirection: .vertical,
                 sender: self).show(.custom(duration))
        }
    }

For progress indicator - MBProgressHUD:

func showLoadingAnimation() {
        
        DispatchQueue.main.async {
            let hud = MBProgressHUD.showAdded(to: self.view, animated: true)
            hud.backgroundColor = UIColor.init(white: 0.5, alpha: 0.3)
        }
    }

bgoncharov/ToDoApp

ToDo App