Swift Lazy Property Initialization

What is a lazy stored property in Swift? How and when should you use it? A quick guide to get you started and some key points to remember. First a recap of the most common ways to declare and initialize stored properties in Swift: Direct Assignment The simplest form of initializer for constant and variable stored properties by direct assignment of an intial value: // constant let fontSize: CGFloat = 24.0 // variable var spacing: CGFloat = 16.0 // Optional var title: String? Note that optionals are initialized to nil by default. I like to collect constant magic numbers like fontSize into a struct, making them static: private struct ViewMetrics { static let fontSize: CGFloat = 24.0 ... } titleLabel.font = ViewMetrics.fontSize Using An Initializer if you do not assign an initial value to a stored property as part of its definition you must set it within an initializer. To quote from The Swift Programming Language guide: Classes and structures must set all of their stored properties to an appropriate initial value by the time an instance of that class or structure is created.

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