Tasks iOs - Homescreen

Make a cool todo app like Google Tasks

Posted by Ky Nguyen on May 16, 2018

Do you want to find a todo list? Google Tasks is a good choice for you. Very easy to use, very cool to keep using.

I admire this app and want to make a good app like this. In this series, I will try to copy Google Tasks in iOS. Hope you keep reading.


I use some code collection from my personal codebase. You can download it at github

Init an empty project and added my mustHave folder

Design UI

Today, we design this screen

There are some parts we need do:

  • Create custom views for the state view (center part) and the function view (bottom part)
  • Design views and set auto layout
  • Add animation when select Add a new task

Create state view

App has states, and app needs state view. So if we design a good view, we can reuse in other apps. This is not a good design, just make it done for this project only.

  • Add new file StateView.swift
  • Paste these code into file

    import UIKit

    class tkStateView: knView {
        let imageView = knUIMaker.makeImageView(image: UIImage(named: "first_empty"), contentMode: .scaleAspectFill)
        let emptyBoldLabel = knUIMaker.makeLabel(text: "A fresh start",
                                                font: UIFont.boldSystemFont(ofSize: 16),
                                                color: .black, alignment: .center)
        let emptyActionLabel = knUIMaker.makeLabel(text: "Anything to add?",
                                                font: UIFont.systemFont(ofSize: 16),
                                                color: UIColor.color(r: 96, g: 99, b: 104),
                                                alignment: .center)
        override func setupView() {
            addSubviews(views: imageView, emptyBoldLabel, emptyActionLabel)
            addConstraints(withFormat: "V:|[v0]-44-[v1]-8-[v2]|", views: imageView, emptyBoldLabel, emptyActionLabel)
            imageView.square(edge: screenWidth / 2)
            imageView.horizontal(toView: self)
            emptyBoldLabel.horizontal(toView: self)
            emptyActionLabel.horizontal(toView: self)


I usually use alias to start the name of class/struct. In this project, it’s tk. With this alias, we can prevent some same names, like NotificationCenter…

Hope code is easy to understand. This view can automatically calculate the size. Its width is screen width / 2, equal to imageView. Its height is calculated by constraints V:|[v0]-44-[v1]-8-[v2]|.

Create function view

  • Add new file name FunctionView.swift and paste code below

    class tkFunctionView: knView {
        let addButton = knUIMaker.makeButton()
        let listOptionButton = knUIMaker.makeButton(image: UIImage(named: "dot_menu"))
        let accountOptionButton = knUIMaker.makeButton(image: UIImage(named: "dash_menu"))
        override func setupView() {
            let plusIcon = knUIMaker.makeImageView(image: UIImage(named: "add")!,
                                                contentMode: .scaleAspectFit)
            plusIcon.change(color: .white)
            let addLabel = knUIMaker.makeLabel(text: "Add a new task",
                                           font: .boldSystemFont(ofSize: 16),
                                           color: .white)
            let addView = knUIMaker.makeView()
            addView.addSubviews(views: plusIcon, addLabel)
            addView.addConstraints(withFormat: "H:|[v0]-16-[v1]|",
                               views: plusIcon, addLabel)
            plusIcon.centerY(toView: addView)
            addLabel.centerY(toView: addView)
            addButton.addSubviews(views: addView)
            addView.center(toView: addButton)
            addButton.backgroundColor = UIColor.color(r: 71, g: 136, b: 241)
            let line = knUIMaker.makeLine(color: .color(value: 234), height: 3)
            addSubviews(views: line, addButton, listOptionButton, accountOptionButton)
            line.horizontal(toView: self)
            line.centerY(toView: addButton)
            addButton.top(toView: self)
            addButton.centerX(toView: self)
            addButton.size(CGSize(width: screenWidth / 1.8, height: 60))
            listOptionButton.right(toView: self, space: -24)
            listOptionButton.verticalSpacing(toView: addButton)
            accountOptionButton.left(toView: self, space: 24)
            accountOptionButton.verticalSpacing(toView: addButton)


When you work in a project, I’m sure you don’t do like this. I have to try to design UI in the main view. When everything works great, I split them up to smaller view to be easier to reuse.

Implement homescreen UI

  • Open file ViewController.swift and change base class to knController. That’s just a UIViewController but I added some other extension for it.

  • Define some views

    let titleLabel = knUIMaker.makeLabel(text: "My Tasks",
                                            font: UIFont.systemFont(ofSize: 36),
                                            color: .black)
    let stateView = tkStateView()
    let functionView = tkFunctionView()

  • Override setupView method from base class

    override func setupView() {
        view.addSubviews(views: titleLabel, stateView, functionView)
        titleLabel.topLeft(toView: view, top: 68, left: 54)
        stateView.center(toView: view)
        functionView.horizontal(toView: view)
        functionView.bottom(toView: view)

  • Run and see.

I don’t like shadow, so I skip drop shadow for the line and the add button in tkFunctionView

Add CreateTaskView

  • Add new file name CreateTaskView.swift and paste code below

    class tkCreateTaskView: knView {
        let taskNameTextView = knUIMaker.makeTextView(placeholder: "New task",
                                                  font: .systemFont(ofSize: 18),
                                                  color: .black)
        let addButton = knUIMaker.makeButton(image: UIImage(named: "add_fill"))
        let saveButton = knUIMaker.makeButton(title: "Save",
                                          titleColor: .color(r: 68, g: 137, b: 242),
                                          font: .boldSystemFont(ofSize: 18))
        var officalBounds = CGRect.zero
        override func setupView() {
            taskNameTextView.showsVerticalScrollIndicator = false
            taskNameTextView.returnKeyType = .done
            taskNameTextView.autocorrectionType = .no

            addSubviews(views: taskNameTextView, addButton, saveButton)
            taskNameTextView.horizontal(toView: self, space: 24)
            taskNameTextView.top(toView: self, space: 16)
            addButton.bottomLeft(toView: self, bottom: -16, left: 24)
            addButton.square(edge: 44)
            saveButton.right(toView: self, space: -24)
            saveButton.centerY(toView: addButton)
            backgroundColor = .white
        override func layoutSubviews() {
            // (1)
            guard officalBounds != bounds else { return }
            officalBounds = bounds

        func makeRoundCorner() {
            let maskPath = UIBezierPath(roundedRect: bounds,
                                        byRoundingCorners: [.topRight, .topLeft],
                                        cornerRadii: CGSize(width: 20, height: 20))
            let shape = CAShapeLayer()
            shape.path = maskPath.cgPath
            layer.mask = shape

(1): method layoutSubviews is called multi times. We don’t need to do anything if bounds does not change.

Animate to show CreateTaskView

Official UI

  • Open ViewController class and add some code

    let newTaskView: tkCreateTaskView = {
        let view = tkCreateTaskView()
        view.frame.size = CGSize(width: screenWidth, height: 130)
        // (1)
        view.alpha = 0
        return view
    // (2)
    override var inputAccessoryView: UIView? { return newTaskView }
    override var canBecomeFirstResponder: Bool { return true }

(1): We will animate the view opacity in next step

(2): There are 2 ways to make the UI like this

  1. First, add newTaskView to view and set auto layout. Observe Keyboard Notification and animate the constraints.

  2. Second, set newTaskView as inputAccessoryView. Much easier. This is what I am doing

  • Add action to show newTaskView in setupView method

    override func setupView() {
        functionView.addButton.addTarget(self, action: #selector(showCreateTaskView))

    @objc func showCreateTaskView() {
        UIView.animate(withDuration: 0.35, animations: { [weak self] in
            self?.newTaskView.alpha = 1

  • Run and see.
  • Almost done. Just miss a black view overlay the main view. Get it done.

    @objc func showBlackView() {
        let blackButton = knUIMaker.makeButton()
        blackButton.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        blackButton.tag = 1001
        view.addSubviews(views: blackButton)
        blackButton.fill(toView: view)
        blackButton.addTarget(self, action: #selector(hideCreateTaskView))

    @objc func hideCreateTaskView() {
        let blackButton = view.viewWithTag(1001)
        UIView.animate(withDuration: 0.35, animations: { [weak self] in
            self?.newTaskView.alpha = 0
            blackButton?.alpha = 0

        run({ blackButton?.removeFromSuperview()
            }, after: 0.35)

    @objc func showCreateTaskView() {

  • OK, run again for final result


We’ve done the first part. You can download the source here.