Industrial Training




iOS Development with Swift 2 - Playground


In this chapter, we will introduce a new environment where we can write and execute a swift code. We will also cover the following aspects of the swift playground −


  • Variables
  • Dictionaries
  • Arrays
  • Loops
  • Classes & Objects

Note − We will look only through those basic concepts, which we will be using in this tutorial, if you want to learn swift deeply, you can check our Swift Tutorial.

Playground is a tool provided with Xcode for executing the swift code. We will start by creating a new playground.

Starting Swift Playground

To create a swift playground, click on Xcode icon, and choose the first option, get started with a swift playground.

started_with_playground

Give the name to your playground and select Platform as iOS. Let us name our playground as the Demo Playground. Click on Next.

name_platform

These are the only steps you need to follow to make a Playground. The following screenshot shows the Playground.

demo_playground
Sr.No Basic Concepts & Description
1

Variables
A variable is a memory / storage that our program can use to store and manipulate data. Each variable has a specific data type, which determines the size that a variable will occupy in memory.

2

Dictionaries
A dictionary is a collection that stores values in a key value pair, i.e. the data stored in a dictionary is stored in a method where each value is related to a key. Here, every key is unique and cannot appear twice in the same dictionary.

3

Arrays
Arrays are the data types that store the same type of data in an ordered list. The same value can appear at multiple indexes/Places in an array.

4

Loops (Control Flow)
Swift provides a variety of Control Flow Statements. Loops are generally used to iterate over a condition or statement multiple times, until a Condition / Programmer’s need from that loop is satisfied.

5

Classes and Objects
Classes are the general-purpose flexible constructs that are the building blocks of your program’s code.

Object is the term that is generally used to refer to instance of a class, so we can call it instance instead of objects.




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