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![protocol SequenceType {
typealias Generator : GeneratorType
func generate() -> Self.Generator
func underestimateCount() -> Int
func map<T>(@noescape transform:
(Self.Generator.Element) -> T) -> [T]
func filter(@noescape includeElement:
(Self.Generator.Element) -> Bool) -> [Self.Generator.Element]
}](https://image.slidesharecdn.com/protocolinswift-150623030821-lva1-app6891/75/Protocol-in-Swift-12-2048.jpg)
Uploaded byYusuke Kita
Protocol in Swift
This document discusses protocols in Swift. It defines a protocol as a blueprint of methods, properties, and requirements that can be adopted by classes, structures, and enumerations. Protocols like Equatable, Comparable, and CollectionType are built-in to Swift and provide common functionality. The document provides examples of built-in protocols and how protocol extensions allow adding functionality to existing protocols.
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Protocol in Swift
- 1.
- 2.
- 3. A protocol definesa blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality.
- 4. The protocol canthen be adopted by a class, structure, or enumeration to provide an actual implementation of those requirements.
- 5.
- 6. struct Int • Equatable •Comparable • IntegerArithmeticType, _IntegerArithmeticType • SignedIntegerType, _SignedIntegerType • IntegerType, _IntegerType
- 7. protocol Equatable { func==(lhs: Self, rhs: Self) -> Bool }
- 8. protocol Comparable :Equatable { func <(lhs: Self, rhs: Self) -> Bool func <=(lhs: Self, rhs: Self) -> Bool func >=(lhs: Self, rhs: Self) -> Bool func >(lhs: Self, rhs: Self) -> Bool }
- 9. protocol IntegerArithmeticType :_IntegerArithmeticType, Comparable { func +(lhs: Self, rhs: Self) -> Self func -(lhs: Self, rhs: Self) -> Self func *(lhs: Self, rhs: Self) -> Self func /(lhs: Self, rhs: Self) -> Self func %(lhs: Self, rhs: Self) -> Self func toIntMax() -> IntMax }
- 10. struct Array<T> • CollectionType •SequenceType • _CollectionDefaultsType • _CollectionGeneratorDefaultsType • MutableCollectionType • Sliceable, _Sliceable • _DestructorSafeContainer
- 11. protocol CollectionType :SequenceType, _CollectionDefaultsType, _CollectionGeneratorDefaultsType { subscript (position: Self.Index) -> Self.Generator.Element { get } var isEmpty: Bool { get } var count: Self.Index.Distance { get } }
- 12. protocol SequenceType { typealiasGenerator : GeneratorType func generate() -> Self.Generator func underestimateCount() -> Int func map<T>(@noescape transform: (Self.Generator.Element) -> T) -> [T] func filter(@noescape includeElement: (Self.Generator.Element) -> Bool) -> [Self.Generator.Element] }
- 13. protocol MutableCollectionType :CollectionType { subscript (position: Self.Index) -> Self.Generator.Element { get set } }
- 14. protocol Sliceable :_Sliceable { typealias SubSlice : _Sliceable subscript (bounds: Range<Self.Index>) -> Self.SubSlice { get } }
- 15. Take a lookinside Swift module for more detail
- 16. Apple introduced Swift 2in WWDC 2015
- 17.
- 18. Protocol extension This allowsyou to define behavior on protocols themselves, rather than in each type’s individual conformance or in a global function.
- 19. protocol CustomStringConvertible { vardescription: String { get } } extension CustomStringConvertible { var capitalizedDescription: String { return self.description.capitalizedString } var uppercaseDescription: String { return self.description.uppercaseString } var lowercaseDescription: String { return self.description.lowercaseString } }
- 20.
- 21.
- 22. Protocol extensions =magic(almost)
- 23.