Coding Challenge for iOS

Overview

Your goal is to build a simple iPad app for creating floor layouts using a 'drag and drop' interface and visual furniture elements. The app must be able to persist each floor layout created and also provide a way to browse all previously created floor layouts. A basic functional spec and some guidelines are provided below, but you are welcome to get as creative as you wish. This is a simple project, but organize, design, test and document your code as if it were going into production. Please then send us a link to the hosted repository (e.g. Github/Bitbucket).

Write your README as if it was for a production service, and include the following items:

An overview of how your code is organized and how the various components interact with each other. Include descriptions of the functionality of each model, view, controller etc.
Technical design decisions made by you (E.g. What made you choose a particular database, data structure, algorithm etc.)
Trade-offs you might have made, anything you left out, or what you might do differently if you were to spend additional time on the project
Any third-party libraries or code snippets you might have used.
Instructions & minimum requirements for bulding and running your code (E.g. iOS version etc.)

Functional Spec

A 'drag and drop' interface is required. The User must be able to pick from at least 3 different furniture elements and place the elements on a part of the screen representing the floor.
Any number of furniture elements can be placed on a floor in a single layout as long as the elements do not overlap.
Each furniture element in a layout should have a text field to give it a name.
Each layout should have a text field to give it a name.
'New' button to create a fresh (empty) layout. Pressing 'New' should discard the layout currently on the screen (unless it has been explicitly saved)
'Save' button to save the layout that is currently on the screen.
'Browse' button to present the user with a list of previosuly saved layouts. Clicking on the name of a previously saved layout should display it in the same area used for creating layouts.
Furniture elements placed on a layout can be moved around further, until the 'Save' button is pressed. Once a layout is saved, it cannot be edited.
The saved layouts must persist between app re-starts.
Only the landscape orientation needs to be supported.

Guidelines

We have provided some wireframes below to give you an idea of what we expect the app might look like.
Dont focus too much on creating a pixel-perfect UI. It should just be neat and easy to operate.
In the simplest case you could represent the different furniture elements by various shapes & colors.
How you choose to persist the floor layouts is pretty open-ended.

Wireframes

Creating a New Floor Layout: