From e4f6866cbcc185abe9a298d56975ca9b26465d53 Mon Sep 17 00:00:00 2001 From: AceVest Date: Thu, 16 Mar 2017 23:46:35 +0800 Subject: [PATCH] Swift - Initialization --- .../Contents.swift | 160 ++++++++++++++++++ .../UserInterfaceState.xcuserstate | Bin 23829 -> 23809 bytes 2 files changed, 160 insertions(+) diff --git a/learn/AcePlay/AcePlay.playground/Pages/Initialization.xcplaygroundpage/Contents.swift b/learn/AcePlay/AcePlay.playground/Pages/Initialization.xcplaygroundpage/Contents.swift index a7ddf9f..cae7fb1 100644 --- a/learn/AcePlay/AcePlay.playground/Pages/Initialization.xcplaygroundpage/Contents.swift +++ b/learn/AcePlay/AcePlay.playground/Pages/Initialization.xcplaygroundpage/Contents.swift @@ -173,4 +173,164 @@ print("CenterRect: \(centerRect.description)") // 类的继承和构造过程 +// 每一个类都必须拥有至少一个指定构造器 +// 应当只在必要的时候为类提供便利构造器 +// 指定构造器语法 +// init(parameters) { +// statements +// } + +// 便利构造器语法 +// convenience init(parameters) { +// statements +// } + + +// 构造器之间的代理规则 +// 1. 指定构造器必须调用其直接父类的的指定构造器 +// 2. 便利构造器必须调用同类中定义的其它构造器 +// 3. 便利构造器必须最终导致一个指定构造器被调用 + + +// 换种说法 +// 1. 指定构造器必须总是向上代理 +// 2. 便利构造器必须总是横向代理 + + + +// +// 两段式构造安全检查 +// +// 需要注意`初始化` 和 `赋新值`之间的细微差别 +// 1. 指定构造器必须保证它所在类引入的所有属性都必须先`初始化`完成 +// 2. 指定构造器必须先向上代理调用父类构造器，然后再为继承的属性`赋新值` +// 3. 便利构造器必须先代理调用同一类中的其它构造器，然后再为任意属性赋新值 +// 4. 构造器在第一阶段构造完成之前，不能调用任何实例方法，不能读取任何实例属性的值，不能引用self作为一个值 + + +// +// 阶段 1 +// +// 某个指定构造器或便利构造器被调用。 +// 完成新实例内存的分配，但此时内存还没有被初始化。 +// 指定构造器确保其所在类引入的所有存储型属性都已赋初值。存储型属性所属的内存完成初始化。 +// 指定构造器将调用父类的构造器，完成父类属性的初始化。 +// 这个调用父类构造器的过程沿着构造器链一直往上执行，直到到达构造器链的最顶部。 +// 当到达了构造器链最顶部，且已确保所有实例包含的存储型属性都已经赋值，这个实例的内存被认为已经完全初始化。此时阶段 1 完成。 + +// +// 阶段 2 +// +// 从顶部构造器链一直往下，每个构造器链中类的指定构造器都有机会进一步定制实例。构造器此时可以访问self、修改它的属性并调用实例方法等等。 +// 最终，任意构造器链中的便利构造器可以有机会定制实例和使用self + + + +// Swift 中的子类默认情况下不会继承父类的构造器 +// 父类的构造器仅会在安全和适当的情况下被继承 +// 在编写一个和父类中指定构造器相匹配的子类构造器时，实际上是在重写父类的这个指定构造器。因此必须在定义子类构造器时带上override修饰符 +// 如果编写了一个和父类便利构造器相匹配的子类构造器，由于子类不能直接调用父类的便利构造器，因此并不算子类重写父类构造器。所以不需要加override前缀 + + + +// Vehicle 只为存储属性提供默认值，而不自定义构造器 +// 因此它会自动获得一个默认构造器 +class Vehicle { + var numberOfWheels = 0 + var description: String { + return "\(numberOfWheels) wheel(s)" + } +} + +let someVehicle = Vehicle() +print("SomeVehicle: \(someVehicle.description)") + +class Bicycle: Vehicle { + override init() { // 重写默认构造器 + + super.init() // 调用父类默认构造器 + + numberOfWheels = 2 // 赋新值 + } +} + +let someBicycle = Bicycle() +print("SomeBicycel: \(someBicycle.description)") + + + + + +// 构造器的自动继承 +// 规则1: 如果子类没有定义任何`指定构造器`，它将自动继承所有父类的指定构造器。 +// 规则2: 如果子类提供了所有父类指定构造器的实现——无论是通过规则1继承过来的，还是提供了自定义实现——它将自动继承所有父类的`便利构造器` +// 注意: +// 1. 即使你在子类中添加了更多的便利构造器，这两条规则仍然适用。 +// 2. 对于规则2，子类可以将父类的指定构造器实现为便利构造器。 + + + +class Food { + var name: String + + // 指定构造器 + init(name: String) { + self.name = name + } + + // 便利构造器 + convenience init() { + self.init(name: "[Unnamed]") + } +} + + +let namedMeat = Food(name: "Bacon") + + +class RecipeIngredient: Food { // 食谱 材料 <==> 食材 + var quantity: Int + + init(name: String, quantity: Int) { + self.quantity = quantity + + super.init(name: name) + } + + // 重写父类的指定构造器，可以改写成便利构造器 + override convenience init(name: String) { + + // 便利构造器只允许调用本类的构造器 + self.init(name: name, quantity: 1) + } + + + // 由于RecipeIngredient类实现了父类Food的所有指定构造器 + // 因此它自动继承了父类Food的所有便利构造器 + // 在这个例子中是继承了 + // convenience init() { + // self.init(name: "[Unnamed]") + // } + // 只不过继承的这个便利构造器代理的不是Food，而是RecipeIngredient这个类 + // 因此self指的不是Food而是RecipeIngredient + + var description: String { + return "RecipeIngredient: \(self.name) x \(self.quantity)" + } +} + +// 因此有三种方式创建RecipeIngredient的实例 + +// 1. 调用将父类指定构造器重写为便利构造器的构造器 +let oneBacon = RecipeIngredient(name: "Bacon") +print("OneBacon: \(oneBacon.description)") + +// 2. 调用新写的指定构造器 +let sixEggs = RecipeIngredient(name: "Egg", quantity: 6) +print("SixEggs: \(sixEggs.description)") + +// 3. 调用继承自父类的便利构造器 +// 需要注意的是此时的构造器代理的不是父类而是当前类 +let oneMysterItem = RecipeIngredient() +print("OneMysterItem: \(oneMysterItem.description)") diff --git 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