Swift Basics - Enumerations

Enumerations
They can contain strings, characters, integers, or floating points.
To define an enumeration:
enum DaysOfWeek
{
  case Monday
  case Tuesday
  case Wednesday
}
OR
enum DaysOfWeek
{
  case Monday, Tuesday, Wednesday
 case Thursday, Friday, Saturday, Sunday
}

We can assign an enumeration value to a variable:
var today = DaysOfWeek.Saturday
We can use it with a switch case:
switch today
{
 case .Monday: print("Monday")
 case .Tuesday: print("Tuesday")
 default: print("Another day")
}

We can also populate enumerations with raw values

enum MyFavs: String
{
 case musicGenre = "Rock"
 case movie = "Shindler's List"
 case song = "Vindicated"
}
print("My fav song is : \(MyFavs.song.rawValue)")

We can assign numbers:
enum Months: Int 
{
 case January = 1
 case February= 2
}

print("The month January is month number \(Months.January.rawValue)")

We can assign more than one value to each case of an enumeration:
enum Food
{
 case Pizza(Double, Int, Int)
 case chickenRice(Double, Int)
}
var thisPizza = Food.Pizza(436.24, 1, 2)
switch thisPizza
{
  case .Pizza(let calories, let servings, let slices)
 print("Calories: \(calories)")


}

Comments

Post a Comment

Popular posts from this blog

Sharing on social media

Sharing on facebook import Social //create a sharing function for Facebook, in button clicked  if let vc = SLComposeViewController(forServiceType: SLServiceTypeFacebook)         {          shareOnFb(vc: vc)                   } //add function below func shareOnFb(vc: SLComposeViewController)     {         vc.setInitialText("Posted this from my swift app")         vc.add(thisImage)         let theurl = URL(string: "http://swiftcodingreferencebook.blogspot.sg")         vc.add(theurl)         present(vc, animated: true, completion: nil)           } Sharing on Instagram in info.plist Create a key of type array: LSApplicationQueriesSchemes Control+click and add a row Item 0 value: instagram add to class ViewController: UIViewController,...
Read more

Navigation controller

It creates a navigation bar for all the pages in the storyboard. It has a back button, a title and a few other custom buttons that you can add. You can customise its colour as well. Add a navigation controller 1. Add it from the object library. 2. Drag it to a place outside the main storyboard. Make it the first page. 1. Select the navigation controller page 2. Drag it to the left of the first scene. 3. Go to attributes inspector, scroll and hide others until you see 'Is initial view controller' and check against it. 4. Control, click and drag from navigation controller to first scene and choose 'root view controller'. 5. To set the title, click on the view controller scene and select its title bar (the one with the battery). At where the attributes inspector is, key in the title of the app. 6. To make it such that all views have the same colour in the title bar, click on 'navigation bar' under 'navigation controller' on the left hand side of...
Read more