Pre-work – Tip Calculator

Tip Calculator is a tip calculator application for iOS.

Submitted by: Jonathan Ballona Sanchez

Time spent: 7 hours spent in total

User Stories

The following required functionality is complete:

  • User can enter a bill amount, choose a tip percentage, and see the tip and total values.
  • User can select between tip percentages by tapping different values on the segmented control and the tip value is updated accordingly

The following optional features are implemented:

  • UI animations
  • Remembering the bill amount across app restarts (if <10mins)
  • Using locale-specific currency and currency thousands separators.
  • Making sure the keyboard is always visible and the bill amount is always the first responder. This way the user doesn’t have to tap anywhere to use this app. Just launch the app and start typing.

The following additional features are implemented:

  • List anything else that you can get done to improve the app functionality!
  • Change the theme of the app
  • The user can adjust the tip percentages on the segmented control and is updated accordingly
  • User can split the bill and see the tip and total each person needs to pay

Video Walkthrough

Here’s a walkthrough of implemented user stories:

Video Walkthrough

GIF created with LiceCap.


Describe any challenges encountered while building the app.


Copyright [2021] [Jonathan Ballona Sanchez]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.


View Github