/swift-extensions-lab-ios-0616

Primary LanguageSwift

#Extensions

##Objectives

  • Practice creating extensions on classes
  • Practice calling and printing values associated with extensions created

##Instructions

Open the workspace and create a new empty Swift file called Extensions. This is where you're going to create all of the extensions. Remember to run often but without the declaration of the objects and functions listed below you won't be able to run the tests. But you can always use the console to make sure your getting the correct output.

###String

  1. Create an extension function for the String class called whisper()
  • Returns a String in lowerscase to create a whispering effect
  1. Create a String extension function for the String class called shout()
  • Returns a String in upperscase to create a shouting effect
  1. Create a String extension computed property for the String class called pigLatin
  • Takes the first letter of a word and moves it to the end
  • Adds the letters "ay" to the end of the word
  • Should be able to handle sentances
  • If it's a single letter, it should return the character
  1. Create an Int extension computed property for the String class called points
  • Should calculate the amount of points a given string has
  • 1 point for consonants and 2 points for vowels
  • Ignores spaces and numbers, returns zero for empty strings

###Int 2. Create an extension function for the Int class called half()

  • Halves itself
  1. Create an extension function for the Int class called isDivisibleBy()
  • To find out if the recipient Int is divisible by the argument
  • Takes in an Int argument
  • Returns a bool
  1. Create an extension computed property for the Int class called squared
  • Squares itself
  1. Create an extension computed property for the Int class called halved
  • Halves itself by calling a function

##Using Your Extensions In ViewController.swift inside the function body of viewDidLoad():

  1. Create a String object with the value as your full name called fullName
  2. Create an Int object with the value 8675309 called phoneNumber
  3. Print the value of the extension computed properties on fullName and phoneNumber
  4. Call all of your String and Int functions on your name and print them to the console

###Emoji 1.Create a computed extension property on String called unicornLevel

  • Calculates one unicorn for each character in the recipient String
  • Use this totes adorbs unicorn emoji 🦄 directly in your code. For example:
let unicornPhrase = "My 🦄 is awesome"
print(unicornPhrase)

Console output: My 🦄 is awesome

2.You probably haven't interacted with UIView much or maybe not at all, but let's get our unicorn status to be displayed in the simulator. Don't worry too much about how it's doing it just yet. You'll get into that later on!

In the ViewController.swift:

  • You'll see that we've added something called an IBOutlet to the top called unicornLevelLabel. This represents the object we're going to display our text in.
  • unicornLevelLabel has a property text set the value of the property to your name object's unicornLevel property
  • Run the program and see your unicorn level displayed in the simulator!