Delegate
func namePickerView(_ namePickerView: NamePickerView, didSelectName name: String)
func namePickerViewShouldReload(_ namePickerView: NamePickerView) -> Bool
Constans
enum Math {
static let e = 2.718281828459045235360287
static let root2 = 1.41421356237309504880168872
}
let hypotenuse = side * Math.root2
struct Configs {
struct App {
static let githubUrl = "https://github.com/"
static let bundleIdentifier = "com.public.SwiftHub"
}
}
Control Flow
for _ in 0..<3 {
print("Hello three times")
}
for (index, person) in attendeeList.enumerated() {
print("\(person) is at position #\(index)")
}
for index in stride(from: 0, to: items.count, by: 2) {
print(index)
}
for index in (0...3).reversed() {
print(index)
}
for item in collection where item.hasProperty {
// ...
}
Lazy
lazy var locationManager = makeLocationManager()
private func makeLocationManager() -> CLLocationManager {
let manager = CLLocationManager()
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.delegate = self
manager.requestAlwaysAuthorization()
return manager
}
RxSwift
private var viewSubject = BehaviorSubject<Bool>(value: false)
public var viewStatus: Observable<Bool> {
return viewSubject.asObservable()
}
Enum
public enum HTTPStatus: Int {
case ok = 200
case badRequest = 400
case notAuthorized = 401
case paymentRequired = 402
case forbidden = 403
case notFound = 404
case internalServerError = 500
}
Func
- 刷新视图的方法名要以 refresh 为首
- 更新数据的方法名要以 update 为首
- 调整视图的方法名要以 adjust 为首
- 配置 configure
- initialSetup
- updateUIFromModel
Struct
Stanford
struct PlayingCard {
/// Suit of the card
var suit: Suit
/// Rank of the card
var rank: Rank
/// Represents a Suit in a playing card
enum Suit: String {
case spades = "♠️"
case hearts = "♥️"
case clubs = "♣️"
case diamonds = "♦️"
/// Array containing all possible suits
static var all: [Suit] = [.spades, .hearts, .clubs, .diamonds]
}
/// Represents the Rank in a playing card
enum Rank {
case ace
case face(String) // ugly design
case numeric(Int)
/// The order of each Rank
var order: Int {
switch self {
case .ace: return 1
case .numeric(let pips): return pips
case .face(let kind) where kind == "J": return 11
case .face(let kind) where kind == "Q": return 12
case .face(let kind) where kind == "K": return 13
default: return 0 // ugly design
}
}
/// Array containing all possible suits
static var all: [Rank] {
// Ace
var allRanks: [Rank] = [.ace]
// 2...10
for pips in 2...10 {
allRanks.append(.numeric(pips))
}
// Jack, Queen, King
allRanks += [.face("J"), .face("Q"), .face("K")]
return allRanks
}
}
}
// Make `PlayingCard` confrom to `CustomStringConvertible`
extension PlayingCard: CustomStringConvertible {
/// String representation of a `PlayingCard`
var description: String {
return "\(rank)\(suit)"
}
}
// Make `PlayingCard.Suit` confrom to `CustomStringConvertible`
extension PlayingCard.Suit: CustomStringConvertible {
/// String representation of a `PlayingCard.Suit`
var description: String {
return rawValue
}
}
// Make `PlayingCard.Rank` confrom to `CustomStringConvertible`
extension PlayingCard.Rank: CustomStringConvertible {
/// String representation of a `PlayingCard.Rank`
var description: String {
switch self {
case .ace: return "A"
case .numeric(let pips): return String(pips)
case .face(let kind): return kind
}
}
}
关键字
- @discardableResult
View层级
- container
- content
Stop Using Booleans
enum BoolEnum {
/// Bool have only we values, so declared on and off cases here.
case on
case off
/// isOn and isOff varaibles for getting is on and off
var isOn: Bool {
self == .on
}
var isOff: Bool {
self == .off
}
/// switchType method we can use to switch current value into another value
mutating func switchType() {
switch self {
case .on:
self = .off
case .off:
self = .on
}
}
/// currentValue will give what is the current value.
var currentValue : Bool {
switch self {
case .on:
return true
case .off:
return false
}
}
}
/// Variable Declartion
var isDataLoading : BoolEnum = .on
/// check is data loading on
if isDataLoading.isOn {
print("Loading is on")
}
/// check is data loading off
if isDataLoading.isOff {
print("Loading is off")
}
/// Switch varaible state
isDataLoading.switchType()
/// Get current value of varaible
isDataLoading.currentValue
String
isEmpty vs. count == 0 O(1) vs O(N) 使用 isEmpty
