Getting Started with iOS 9 Development

Discover variables and constants in Swift using a playground to declare var for mutable values and let for constants, and observe mutating errors when modifying a let.

Learn how Swift sets are unindexed collections of like type values with no duplicates, created with set annotations and array initialization, and perform contains, insert, remove, intersection, and union.

Explore Swift loops: for, for-in, while, and repeat, including counted loops versus uncountable loops, arrays, indexing rules, and control statements like break and continue.

Learn basic function syntax in Swift, including parameter lists, return values, and how external and internal parameter names affect calls.

Explore Swift enumerations as a type definition using a stoplight with red, amber, or green cases. Learn how associated values and type inference extend enums beyond C-style unions.

Learn to define Swift enumerations with raw values, assigning red=1, amber=2, green=3, instantiate from rawValue, and use hashable types like 32-bit hex colors.

Discover how computed properties derive values at runtime by using getters and setters to calculate a circle’s area from its radius and update the radius when setting the area.

Define and use a lazy property to defer initialization until needed, illustrated with a fraction whose decimal is computed by a closure and becomes nil when the denominator is zero.

Define a root class and a sellable item subclass to illustrate inheritance in Swift. Learn name, product ID, count, price, total price, discount, and colon syntax.

Begin iOS development by building a simple first app with a label, text field, and hello message, and learn keyboard behavior and the simulator keyboard toggle.

Create a new Xcode project with a single view iOS app in Swift, and implement a model-view-controller flow using a model class for the user name.

The model-view-controller pattern separates data from presentation and puts business logic in the controller. The controller wires views to models via outlets and actions, using target-action to handle events.

Learn to display tabular data in an iOS app by wiring a table view controller to a simple model, configuring prototype cells, and using a reuse identifier.

Discover how a table view controller uses the data source and delegate methods to supply sections, rows, header titles, and index-path driven data mapping.

Learn to create, edit, and organize code snippets in the Xcode snippet library, drag and drop reusable boilerplate code, and manage deletion for efficient development.