Downloaded 17 times
![18
struct StoriesDisplayCollection {
var stories: Results<StoryEntity>
var count: Int {
return stories.count
}
func nameAtIndex(index: Int) -> String {
return stories[index].name
}
}](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-18-320.jpg)
![19
struct StoriesDisplayCollection {
var stories: Results<StoryEntity>
var count: Int {
return stories.count
}
func nameAtIndex(index: Int) -> String {
return stories[index].name
}
}
Stories](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-19-320.jpg)
![20
struct StoriesDisplayCollection {
var stories: Results<StoryEntity>
var count: Int {
return stories.count
}
func nameAtIndex(index: Int) -> String {
return stories[index].name
}
}](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-20-320.jpg)
![23
enum Content {
case result(Results<T>)
case list(List<T>)
case empty
subscript(index: Int) -> T {
switch self {
case let .result(model):
return model[index]
case let .list(list):
return list[index]
case .empty:
return T.templateEntity
}
}
}
Nested
Same T, Swift 3.1+](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-23-320.jpg)
![41
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-41-320.jpg)
![42
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")
Protocol](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-42-320.jpg)
![43
Swift 3.1+
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-43-320.jpg)
![44
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")
Generic Element](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-44-320.jpg)
![45
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")
Index == Int
subscript(position: Self.Index)
-> Self.Iterator.Element { get }](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-45-320.jpg)
![46
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")](https://image.slidesharecdn.com/swiftmagic-170523144541/85/Alexander-Zimin-Swift-46-320.jpg)
![18
struct StoriesDisplayCollection {
var stories: Results<StoryEntity>
var count: Int {
return stories.count
}
func nameAtIndex(index: Int) -> String {
return stories[index].name
}
}](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-18-2048.jpg)
![19
struct StoriesDisplayCollection {
var stories: Results<StoryEntity>
var count: Int {
return stories.count
}
func nameAtIndex(index: Int) -> String {
return stories[index].name
}
}
Stories](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-19-2048.jpg)
![20
struct StoriesDisplayCollection {
var stories: Results<StoryEntity>
var count: Int {
return stories.count
}
func nameAtIndex(index: Int) -> String {
return stories[index].name
}
}](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-20-2048.jpg)
![23
enum Content {
case result(Results<T>)
case list(List<T>)
case empty
subscript(index: Int) -> T {
switch self {
case let .result(model):
return model[index]
case let .list(list):
return list[index]
case .empty:
return T.templateEntity
}
}
}
Nested
Same T, Swift 3.1+](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-23-2048.jpg)
![41
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-41-2048.jpg)
![42
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")
Protocol](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-42-2048.jpg)
![43
Swift 3.1+
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-43-2048.jpg)
![44
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")
Generic Element](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-44-2048.jpg)
![45
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")
Index == Int
subscript(position: Self.Index)
-> Self.Iterator.Element { get }](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-45-2048.jpg)
![46
extension Collection where Index == Int {
var second: Iterator.Element? {
guard self.count > 1 else { return nil }
return self[1]
}
}
var array = ["A", "B", "C"]
print(array.second) // Optional("B")](https://image.slidesharecdn.com/swiftmagic-170523144541/75/Alexander-Zimin-Swift-46-2048.jpg)
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Александр Зимин (Alexander Zimin) — Магия Swift
The document discusses various features of Swift programming, including nested types, generics, and protocol-oriented programming. It emphasizes the advantages of Swift such as speed and efficiency, and introduces various examples of using UIColor and protocols for summable types and cell view models. Additionally, it highlights the importance of extending protocols and implementing default behaviors in protocol extensions.
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Similar to Александр Зимин (Alexander Zimin) — Магия Swift
Александр Зимин (Alexander Zimin) — Магия Swift
- 2. 2 • Nested Types •Generics • Protocols • Protocol-Oriented Programming • Mirror Type and Reflection
- 3.
- 4. 4 It’s fast 🚀It’s powerful 💪 It’s awesome 🏆 Why Swift?
- 5.
- 6.
- 7. 7 view.backgroundColor = UIColor(hexString: "6094EA") view.backgroundColor= UIColor(.strongGray) view.backgroundColor = UIColor.strongGray
- 8.
- 9. 9 extension UIColor { staticvar tableElementsSeparator: UIColor { return UIColor(.strongGray) } static var barsSeparator: UIColor { return UIColor(.red) } static var barsBackground: UIColor { return UIColor(.gray) } } Type Omission
- 10. 10 extension UIColor { staticvar tableElementsSeparator: UIColor { return UIColor(.strongGray) } static var barsSeparator: UIColor { return UIColor(.red) } static var barsBackground: UIColor { return UIColor(.gray) } static var toolBox: UIColor { return UIColor(.gray) } static var activeControl: UIColor {
- 11. 11 extension UIColor { staticvar tableElementsSeparator: UIColor { return UIColor(.strongGray) }s static var barsSeparator: UIColor { return UIColor(.red) }s static var barsBackground: UIColor { return UIColor(.gray) }s }s
- 12. 12 extension UIColor { structSeparator { static var tableElements: UIColor { return UIColor(.strongGray) }s static var bars: UIColor { return UIColor(.red) }s } }s Struct Enum
- 13. 13 extension UIColor { enumSeparator { static var tableElements: UIColor { return UIColor(.strongGray) }s static var bars: UIColor { return UIColor(.red) }s } }s
- 14.
- 15.
- 16.
- 17.
- 18. 18 struct StoriesDisplayCollection { varstories: Results<StoryEntity> var count: Int { return stories.count } func nameAtIndex(index: Int) -> String { return stories[index].name } }
- 19. 19 struct StoriesDisplayCollection { varstories: Results<StoryEntity> var count: Int { return stories.count } func nameAtIndex(index: Int) -> String { return stories[index].name } } Stories
- 20. 20 struct StoriesDisplayCollection { varstories: Results<StoryEntity> var count: Int { return stories.count } func nameAtIndex(index: Int) -> String { return stories[index].name } }
- 21. 21 struct StoriesDisplayCollection { varstories: Results/List<StoryEntity> } struct StoriesDisplayCollection { var stories: TemplateModelsCollection<StoryEntity> }
- 22.
- 23. 23 enum Content { caseresult(Results<T>) case list(List<T>) case empty subscript(index: Int) -> T { switch self { case let .result(model): return model[index] case let .list(list): return list[index] case .empty: return T.templateEntity } } } Nested Same T, Swift 3.1+
- 24. 24 struct TemplateModelsCollection<T: TemplateEntity> whereT: Object { init(dataCollection: Results<T>, templatesCount: Int = 5) { content = Content.result(dataCollection) values = List<T>() generateFakeData(templatesCount: templatesCount) } } Template One
- 25. 25 struct TemplateModelsCollection<T: TemplateEntity> whereT: Object { var count: Int { if isLoading && content.count == 0 { return values.count } else { return content.count } } } Template One
- 26.
- 27.
- 28. 28 protocol Summable { staticfunc +(lhs: Self, rhs: Self) -> Self } extension Int: Summable { } extension String: Summable { } public func +(lhs: Int, rhs: Int) -> Int public func +(lhs: String, rhs: String) -> String
- 29. 29 protocol Summator { associatedtypeValue func sum(a: Value, b: Value) -> Value }
- 30. 30 protocol Summator { associatedtypeValue func sum(a: Value, b: Value) -> Value } extension Summator where Value: Summable { func sum(a: Value, b: Value) -> Value { return a + b } }
- 31. 31 struct IntSummator: Summator{ typealias Value = Int } let summator = IntSummator() print(summator.sum(a: 5, b: 10)) // 15
- 32. 32 • We haveSelf/associatedtype for future type implementation • We can specify rules for associatedtype • We can extend protocols with logic • We can specify constraints for protocol extensions
- 33.
- 34.
- 35. 35 • Value Typeover Reference Type • No inheritance • No mutability • Advanced usage of protocols and its extensions
- 36.
- 37.
- 38.
- 39.
- 40.
- 41. 41 extension Collection whereIndex == Int { var second: Iterator.Element? { guard self.count > 1 else { return nil } return self[1] } } var array = ["A", "B", "C"] print(array.second) // Optional("B")
- 42. 42 extension Collection whereIndex == Int { var second: Iterator.Element? { guard self.count > 1 else { return nil } return self[1] } } var array = ["A", "B", "C"] print(array.second) // Optional("B") Protocol
- 43. 43 Swift 3.1+ extension Collectionwhere Index == Int { var second: Iterator.Element? { guard self.count > 1 else { return nil } return self[1] } } var array = ["A", "B", "C"] print(array.second) // Optional("B")
- 44. 44 extension Collection whereIndex == Int { var second: Iterator.Element? { guard self.count > 1 else { return nil } return self[1] } } var array = ["A", "B", "C"] print(array.second) // Optional("B") Generic Element
- 45. 45 extension Collection whereIndex == Int { var second: Iterator.Element? { guard self.count > 1 else { return nil } return self[1] } } var array = ["A", "B", "C"] print(array.second) // Optional("B") Index == Int subscript(position: Self.Index) -> Self.Iterator.Element { get }
- 46. 46 extension Collection whereIndex == Int { var second: Iterator.Element? { guard self.count > 1 else { return nil } return self[1] } } var array = ["A", "B", "C"] print(array.second) // Optional("B")
- 47. 47 • Follow Ifrom SOLID • Implement default behaviour in protocol extensions • Implement generic based behaviour • Combine multiply protocols or “inherit” them The interface-segregation principle (ISP) states that no client should be forced to depend on methods it does not use.
- 48.
- 49. 49 protocol CellViewModel { associatedtypeCellType: UIView func setup(cell: CellType) } Generic Generic
- 50. 50 protocol CellViewModel: CellViewAnyModel{ associatedtype CellType: UIView func setup(cell: CellType) } Non generic
- 51. 51 protocol CellViewAnyModel { staticvar cellAnyType: UIView.Type { get } func setupAny(cell: UIView) } associatedtype CellType: UIView func setup(cell: CellType)
- 52. 52 extension CellViewModel { staticvar cellAnyType: UIView.Type { return CellType.self } func setupAny(cell: UIView) { setup(cell: cell as! CellType) } } !!!
- 53. 53 • https://github.com/JohnSundell/SwiftTips • https://developer.apple.com/swift/blog/ •https://swift.org/blog/ • https://swiftnews.curated.co • https://www.raizlabs.com/dev/2016/12/swift-method- dispatch/ • https://github.com/ole/whats-new-in-swift-4
- 54. 54 • https://github.com/JohnSundell/SwiftTips • https://developer.apple.com/swift/blog/ •https://swift.org/blog/ • https://swiftnews.curated.co • https://www.raizlabs.com/dev/2016/12/swift-method- dispatch/ • https://github.com/ole/whats-new-in-swift-4
- 55.