Join Scott Gardner for an in-depth discussion in this video External protocols, part 1, part of Swift 3 Essential Training: Beyond the Basics.
- [Narrator] Protocols can be extended…to provide a default implementation of one or more…of the protocol's requirements.…I'm starting out with a series of protocols…that separately define requirements for a car.…Vehicular requires a passenger capacity property.…Motorized requires a horsepower property.…Wheeled, a number of wheels property,…and drivable, a current speed property…and an accelerate to speed method.…I'll define as Sedan class that adopts all these protocols.…
I'm rewarded with four errors, one for each protocol…Sedan declared adoption of, but has not yet conformed to.…Instead of implementing all the requirements in Sedan,…I will instead define extensions on these protocols…to provide default implementations.…Starting with the Vehicular protocol,…I'll define an extension that returns…a default value of four for passenger capacity.…Extensions cannot contained stored values,…so I've defined this as a computed property.…
Next, I'll extend Motorized,…and return 100 for its required horsepower property.…
- 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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