Learn and Understand Building Modern iOS Apps

Explore integrated development environments and their essential tools, including code editor, compiler, simulator, and version control. See how Xcode drives iOS, watchOS, and tvOS development.

Explore configuring the iOS simulator and running your app with its features on a device. Compare the simulator and real device tradeoffs to decide when to test on each.

Master the fundamentals of user interface design, covering key terminology and concepts, Apple’s UI kit, and how to manage and display images across different devices.

Explore core design concepts like pixels, resolution, screen size, and dots per inch. Learn how the point system yields consistent sizes for iOS apps across devices.

Explore the Cornyn system for placing views, with origin at the top left, x to the right, y downward, and origin, size, and frame examples.

Explore how iOS views nest and relate, with blue super view and green sub view, understand origin and coordinate systems, and use the document outline to identify sibling views.

Learn to build responsive iOS layouts in storyboard by applying auto layout constraints, pinning four views to screen edges, and centering or full-screening elements like a map view.

Learn how Swift organizes data with fundamental data types—character, string, int, float, double, and bool—plus notes on precision, memory tradeoffs, and using a playground.

Learn how Swift uses string interpolation to insert variables into strings, avoiding type mismatches from adding strings and numbers, and how to handle common errors while injecting expressions.

Explore how to connect storyboard-based user interfaces with Swift code by using view controllers, optionals, outlets, and actions, and apply these concepts to build a Mad Libs app.

Explore accessing an optional name via a class property using optional chaining and optional binding. Compare unconditional unwrapping, which can crash, with implicitly unwrapped optionals for concise, safer code.

Connect Interface Builder elements to Swift code using outlets and actions in a storyboard-based iOS app. Create a text field outlet and a submit action to print to the console.

Explore how object-oriented UI components in a UI kit are defined by Apple, and navigate the Apple developer documentation to understand UI text field class definitions, properties, and methods.

Discover how the singleton design pattern ensures one object per class by using a shared instance and private initializer, illustrated with a chief executive officer analogy and Swift examples.

Explore type casting and down casting to treat objects as specific types, including any and any object, using is and optional binding with a movable protocol, toy car, and skateboard.

Explore how a UI table view manages data and cells with a reuse pool, index paths, and different styles, powered by data source and delegate protocols.

Learn to build a storyboard table view by wiring the view controller as data source and delegate, creating a prototype cell with a reuse identifier, and using index paths.

Learn to implement data persistence in iOS apps using the user defaults singleton, saving text with a key and loading it on restart to prepopulate the text field.

Learn to design an iOS app interface using storyboard, with a tab bar and navigation controller, a reminders list in a table view, and an add/edit reminder flow via segues.

Build the favorite reminder view controller and update its title and date labels in viewWillAppear by fetching the earliest reminder from the shared reminders service.