Join Scott Gardner for an in-depth discussion in this video Understand protocols, part of Swift 3 Essential Training: Beyond the Basics.
- [Tutor] A protocol is simply a contract…that defines requirements…that the adopting type agrees to implement.…These requirements can include implementing…properties, methods, or subscripts.…When a type adopts a protocol…and implements the requirements,…it is said to conform to that protocol.…Protocols can also inherit from other protocols…and they can be extended to add functionality…to any type that adopts the protocol being extended.…Even if you don't have access to the types source code,…this is incredibly powerful.…
I'll cover extending protocols in the next chapter.…The syntax to define a protocol…is to write the protocol keyword,…followed by the name,…and then curly braces enclosing its body.…Protocol names should follow the same name…and convention as all other types in Swift,…beginning with a capital letter…and using camel casing.…The names themselves should be descriptive…of the requirements or the outcome…of conforming to those requirements.…Protocols define requirements…but do not actually implement them.…
- 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
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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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