Join Scott Gardner for an in-depth discussion in this video Property observers and accessors, part of Swift 3 Essential Training: Beyond the Basics.
- [Instructor] Stored variable properties, that is,…not constants and not computed properties,…can have property observers defined that will be called…when the property is set after initialization.…I'm starting out with a Number class.…It has a static formatter property…with its numberStyle set to spellOut,…which means it can be used to return a string representation…of a numeric literal value.…And Number has an intValue property…and an initializer to set that value…when creating a new instance of Number.…I've also created an instance of Number…with an initial intValue of one.…
There are two kinds of property observers,…willSet and didSet.…WillSet is called right before…a newValue is set on a property.…I'll add a willSet property observer to the intValue…by writing curly braces after the declaration,…followed by willSet and curly braces…to enclose the willSet body of code.…A newValue constant is automatically created…and available in a willSet observer.…I'll just print it out.…You can optionally define your own name for the newValue…
- Adding source files, resources, links, and literals
- Adding pages to a playground
- Using overflow operators and bitwise operators
- Using ranges with strings
- Creating complex sequences
- Chaining higher-order functions
- Defining lazy properties
- Using failable initializers
- Mutating methods
- Working with singletons
- Nesting function types
- Creating error types and recursive enumerations
- Extending concrete types
- Referencing selectors and key paths
- Working with protocol-oriented programming
- Defining class-only protocols and optional protocols
- Using option sets, type checking, and casting operators
Skill Level Intermediate
Core Data for iOS and macOS Enterprise Developerswith Jon Bott1h 46m Intermediate
Distributing Your iOS App for Testing with TestFlightwith Ron Buencamino35m 10s Intermediate
iOS App Development: Test-Driven Developmentwith Harrison Ferrone2h 14m Intermediate
3. Strings and Characters
4. Sequences and Collections
5. Control Flow
6. Value and Reference Types
9. Access Control
Understand access control3m 47s
Next steps1m 2s
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