Stopwatch
Level 2, Seven Lessons
Lead students in thinking deeper about models, views, controllers, and users. Teach students how to connect interface elements to controller actions, and how to avoid pitfalls that prevent the interface from staying responsive.
The Finished App
Familiarize yourself with the project, and demonstrate the app students will build.
Lesson 1
Facilitate adding interface elements to the main view, and demonstrate Auto Layout constraints.
Lesson 2
Incorporate a model into the project, using optionals and computed properties. Introduce the NSDate and NSTimeInterval types.
Lesson 3
Demonstrate incorporating the model with the controller, and explain the use of default property values. Explain how interactive interface elements connect to controller actions, use Interface Builder to establish connections, and explore the @IBAction attribute.
Lesson 4
Introduce the Bool datatype with a computed property, and illustrate Run Loops by intentionally blocking interface responsiveness.
Lesson 5
Explain how to use an NSTimer to repeatedly execute methods, and the importance of keeping the app interface responsive.
Lesson 6
Lead students in exploring documentation, and challenge them with explicitly extracting time components from an NSTimeInterval.
Lesson 7
Discuss user experience and accessibility. Analyze the controller to discover code that belongs in a computed property of the model.
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