From 8cce995887e8552fd42cb1e2cfb5dcf092716bff Mon Sep 17 00:00:00 2001 From: AceVest Date: Mon, 13 Mar 2017 23:54:04 +0800 Subject: [PATCH] ... --- .../Methods.xcplaygroundpage/Contents.swift | 179 ++++++++++++++++++ .../Contents.swift | 84 +++++++- .../AcePlay.playground/contents.xcplayground | 1 + .../UserInterfaceState.xcuserstate | Bin 21297 -> 22111 bytes 4 files changed, 262 insertions(+), 2 deletions(-) create mode 100644 learn/AcePlay/AcePlay.playground/Pages/Methods.xcplaygroundpage/Contents.swift diff --git a/learn/AcePlay/AcePlay.playground/Pages/Methods.xcplaygroundpage/Contents.swift b/learn/AcePlay/AcePlay.playground/Pages/Methods.xcplaygroundpage/Contents.swift new file mode 100644 index 0000000..745b406 --- /dev/null +++ b/learn/AcePlay/AcePlay.playground/Pages/Methods.xcplaygroundpage/Contents.swift @@ -0,0 +1,179 @@ +//: [Previous](@previous) + +import Foundation + +var str = "Hello, playground" + +//: [Next](@next) + +class Counter { + var count = 0 + + func increment() { + count += 1 + } + + func increment(by amount: Int) { + count += amount + } + + func reset() { + count = 0 + } +} + +var counter = Counter() + +counter.increment() +print(counter.count) +counter.increment(by: 100) +print(counter.count) +counter.reset() +print(counter.count) + +struct Point { + var x = 0.0, y = 0.0 + // 结构体和枚举是值类型。默认情况下，值类型的属性不能在它的实例方法中被修改，如果要修改将关键字mutating 放到方法的func关键字之前 + mutating func move(x deltaX: Double, y deltaY: Double) { + self.x += deltaX + self.y += deltaY + } + + // 可变方法能够赋给隐含属性self一个全新的实例 + mutating func moveTo(x deltaX: Double, y deltaY: Double) { + self = Point(x: deltaX, y: deltaY) + } + var description: String { + get { + return "Point(\(x), \(y))" + } + } +} + + +var point = Point() +print(point.description) +point.move(x: 1, y: 7) +print(point.description) +point.move(x: 8, y: 4) +print(point.description) +point.moveTo(x: 9, y: 9) +print(point.description) + + +// 枚举的可变方法可以把self设置为同一枚举类型中不同的成员 +enum TriStateSwitch: String { + case Off + case Low + case High + + mutating func next() { + switch self { + case .Off: + self = .Low + case .Low: + self = .High + case .High: + self = .Off + } + } + + var description: String { + return "Current State: \(self.rawValue)" + } +} + +var ovenLight = TriStateSwitch.High +print(ovenLight.description) +ovenLight.next() +print(ovenLight.description) +ovenLight.next() +print(ovenLight.description) +ovenLight.next() +print(ovenLight.description) + +// 类型方法 +class SomeClass { + // static & class 加在func前都是定义类型方法的关键字 + // 不同的是static的不能被子类重写该方法 + // 而class则可以 + static func descV1() -> String { + return "BaseDescV1" + } + class func descV2() -> String { + return "BaseDescV2" + } +} + +class SomeDerivedClass: SomeClass { + /* + 取消注释会编译错误 + override static func descV1() -> String { + return "BaseDescV1" + } + */ + override class func descV2() -> String { + return "DerivedDescV2" + } +} + +print(SomeClass.descV1()) +print(SomeClass.descV2()) +print(SomeDerivedClass.descV1()) +print(SomeDerivedClass.descV2()) + + +class LevelTracker { + static var highestUnlockedLevel = 1 + var currentLevel = 1 + + static func unlock(_ level: Int) { + if level > highestUnlockedLevel { + highestUnlockedLevel = level + } + } + + static func isUnlocked(_ level: Int) -> Bool { + return level <= highestUnlockedLevel + } + + @discardableResult // 可以忽略返回值，不会产生警告 + func advance(to level: Int) -> Bool { + if LevelTracker.isUnlocked(level) { + currentLevel = level + return true + } else { + return false + } + } +} + +class Player { + var tracker = LevelTracker() + let playerName: String + + init(name: String) { + self.playerName = name + } + + func complete(level: Int) { + LevelTracker.unlock(level) + tracker.advance(to: level) + } +} + + +var player = Player(name: "Ace") +player.complete(level: 1) +player.complete(level: 2) +if player.tracker.advance(to: 3) { + print("player is now on level 3") +} else { + print("level 3 has not yet been unlocked") +} +player.complete(level: 3) +if player.tracker.advance(to: 3) { + print("- player is now on level 3") +} else { + print("- level 3 has not yet been unlocked") +} diff --git a/learn/AcePlay/AcePlay.playground/Pages/Properties.xcplaygroundpage/Contents.swift b/learn/AcePlay/AcePlay.playground/Pages/Properties.xcplaygroundpage/Contents.swift index d343e4d..be3145e 100644 --- a/learn/AcePlay/AcePlay.playground/Pages/Properties.xcplaygroundpage/Contents.swift +++ b/learn/AcePlay/AcePlay.playground/Pages/Properties.xcplaygroundpage/Contents.swift @@ -51,7 +51,6 @@ print("the DataImporter instance for the importer property has not yet been crea dataManager.importer - printLine("Computed Properties") struct Point { @@ -67,6 +66,7 @@ struct Rect { var origin = Point() var size = Size() + // 必须使用 var 关键字定义计算属性，包括只读计算属性，因为它们的值不是固定的 var center: Point { get { var p = Point() @@ -81,7 +81,7 @@ struct Rect { } /* - //set 有更简洁的写法，set重命名参数的话默认参数名为newValue + //set 有更简洁的写法，set重命名参数的话默认参数名为newValue set { origin.x = newValue.x - size.width/2 @@ -119,3 +119,83 @@ class Cuboid { let fourByFiveByTwo = Cuboid(width:4.0, height:5.0, depth:2.0) print(fourByFiveByTwo.volume) + + +// 属性观察器 +class StepCounter +{ + var totalSteps: Int = 0 { + // 默认的分别是newValue & oldValue + willSet(newValue) { + print("About to set totalSteps to \(newValue)") + } + + didSet { + if totalSteps > oldValue { + print("Added \(totalSteps-oldValue) steps") + } + } + } + + var serialNumber: String = "0000-00000-0000000-000" { + // 不想用newValue & oldValue 可以命名为别的方法 + willSet(newSerialNumber) { + print("New serial number \(newSerialNumber)") + } + + didSet(oldSerialNumber) { + print("Old serial number \(oldSerialNumber)") + } + } +} + + +let stepCounter = StepCounter() + +stepCounter.totalSteps = 100 +stepCounter.totalSteps = 300 +stepCounter.totalSteps = 657 +stepCounter.totalSteps = 257 +stepCounter.serialNumber = "0010-23873-83F123A-ECA" +stepCounter.serialNumber = "10A0-8376C-247232E-EST" + + +// 类型属性 +struct SomeStructure { + static var storedType = "Structure" + static var computedType: Int { + return 1; + } +} + +enum SomeEnumeration { + static var v: String = "ComputedEnumeration" + static var storedType = "Enumeration" + static var computedType: String { + get { + return "get" + v + } + + set(v) { + self.v = v + } + } +} + +class SomeClass { + static var storedType = "Class" + static var computedType: String { + return "ComputedClass" + } +} + +print(SomeStructure.storedType) +print(SomeEnumeration.storedType) +print(SomeClass.storedType) + +print(SomeStructure.computedType) +print(SomeEnumeration.computedType) +SomeEnumeration.computedType = "ComputedEnumerationV2" +print(SomeEnumeration.computedType) +print(SomeClass.computedType) + diff --git a/learn/AcePlay/AcePlay.playground/contents.xcplayground b/learn/AcePlay/AcePlay.playground/contents.xcplayground index a6a057a..52e276f 100644 --- a/learn/AcePlay/AcePlay.playground/contents.xcplayground +++ b/learn/AcePlay/AcePlay.playground/contents.xcplayground @@ -9,5 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