niZmosis / SwiftSnippets

A collection of Swift snippets I've found useful when starting out

Swift Snippets

A collection of Swift snippets I've found useful when starting out with the language. These are things that tripped me up due to not reading the Swift Programming Language book enough.

Getting used to closures with UIView Animations

UIView.animateWithDuration(1.0, animations: {() -> Void in
  // Animations
})

Which can be simplified to

UIView.animateWithDuration(1.0, animations: {
  // Animations
})

Which after reading the docs more, if a closure is the last argument then you can just pass it after the call

UIView.animateWithDuration(1.0) {
  // Animations
}

Closures with return types are called like so

UIView.animateWithDuration(1.0, animations: {
  // Animations
}, completion: { success in
  // Completion
})

Lazy Loading

I like to lazy load things, keeps all the ivars in the same place, removing a bunch of code from init() methods. This is how to do it in Swift.

@lazy var awesomeView: UIView = {
  let view: UIView = UIView()
  view.backgroundColor = UIColor.redColor()
  // Any other initial configuration
  return view
}()

Then you'd just call self.addSubview(awesomeView) in your viewDidLoad().