CODEWITHSUNDEEP
iosswiftxcodesyntax
Wayne Filkins
Wayne Filkins

Reputation: 524

What are these little square symbols in Swift 3 code?

Sorry I have been away from programming for a while (since before Swift 3) and even back then I wasn't real good at it. Anyway I was playing around with SwiftyCam:

https://github.com/Awalz/SwiftyCam

And I notice these squares in the code. Anyone know what these things are? Never saw this before, and not sure if it's new with Swift 3 or if I just haven't come across them. Example:

func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFocusAtPoint point: CGPoint) {
   let focusView = UIImageView(image: #imageLiteral(resourceName: "focus"))
   focusView.center = point
   focusView.alpha = 0.0
   view.addSubview(focusView)
}

Okay well I can't even paste it. It's before the word "focus" and there are no quotations it's just (resourceName: ***insert square here***focus)

I hope this makes sense and sorry if it's a dumb question I just don't know how to look something like this up because you can't type squares int he docs or anything.

Upvotes: 0

Views: 306

Answers (1)

Sweeper
Sweeper

Reputation: 271175

The little squares are actually text. They just appear in Xcode as little squares with the name of the image after it. e.g.

enter image description here

As you can see in your pasted code, it's just this in text form:

#imageLiteral(resourceName: "focus")

The above is basically equivalent to:

UIImage(named: "focus")

Another one of these cool literals is #colorLiteral. e.g.

#colorLiteral(red: 0.4131736755, green: 0.7676505446, blue: 0.4273042679, alpha: 1)

These literals are just syntactic sugar that makes your code look prettier:

enter image description here

Upvotes: 3

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