From 5686e0d1c02043d8cb382f21be6675d92d05c8a3 Mon Sep 17 00:00:00 2001 From: jiulinxiri Date: Mon, 10 Jan 2022 00:02:26 +0800 Subject: [PATCH] =?UTF-8?q?=E5=B1=9E=E6=80=A7?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- 10 属性 inout.playground/Contents.swift | 86 ++++++++- .../Resources/README.md | 178 ++++++++++++++++++ .../UserInterfaceState.xcuserstate | Bin 14675 -> 15615 bytes 3 files changed, 262 insertions(+), 2 deletions(-) diff --git a/10 属性 inout.playground/Contents.swift b/10 属性 inout.playground/Contents.swift index dc81a8a..a7afccc 100644 --- a/10 属性 inout.playground/Contents.swift +++ b/10 属性 inout.playground/Contents.swift @@ -6,8 +6,8 @@ struct Circle { var radius: Double // 计算属性 var diameter: Double { - set { - radius = newValue / 2 + set(newDiameter) { + radius = newDiameter / 2 } get { radius * 2 @@ -18,3 +18,85 @@ struct Circle { var circle = Circle(radius: 5) print(circle.radius) print(circle.diameter) + +struct Point { + var x: Int + var y: Int + // 初始化器设置初始值 + init() { + x = 10 + y = 20 + } +} + +var p = Point() + + +struct Point3D { + var x: Int + var y: Int + var z: Int +} + +var p3d = Point3D(x: 10, y: 20, z: 30) + +struct PointA { + var x: Int = 10 + var y: Int = 20 +} + +var pa = PointA() + +class Car { + init() { + print("Car init!") + } + + func run() { + print("Car is running!") + } +} + +class Person { + lazy var car = Car() + init() { + print("Person init!") + } + + func goOut() { + car.run() + } +} + +let ps = Person() +print("-----------") +ps.goOut() + +struct PointB { + var x = 0 + var y = 0 + lazy var z = 0 +} +let pb = PointB() +//print(pb.z) + + + +struct CircleA { + var radius: Double { + willSet { + print("willSet", newValue) + } + didSet { + print("didSet", oldValue, radius) + } + } + init() { + self.radius = 10 + print("Circle init!") + } +} + +var circleA = CircleA() +circleA.radius = 10.5 +print(circleA.radius) diff --git a/10 属性 inout.playground/Resources/README.md b/10 属性 inout.playground/Resources/README.md index 9f56c87..976d005 100644 --- a/10 属性 inout.playground/Resources/README.md +++ b/10 属性 inout.playground/Resources/README.md @@ -30,3 +30,181 @@ struct Circle { 3. 结构体、类可以定义存储属性 4. 枚举 `不可以` 定义存储属性 +Swift 中存储属性的规定 + +* 在创建结构体或类的实例时，必须为所有的存储属性设置一个合适的初始值。 + + * 可以在初始化器里为存储属性设置一个初始值 + * 可以分配一个默认的属性值作为属性定义的一部分 + + ```swift + struct Point { + var x: Int + var y: Int + // 初始化器设置初始值 + init() { + x = 10 + y = 20 + } + } + + var p = Point() + + struct Point3D { + var x: Int + var y: Int + var z: Int + } + // 初始化器设置初始值 + var p3d = Point3D(x: 10, y: 20, z: 30) + + // 分配一个默认的属性值 + struct PointA { + var x: Int = 10 + var y: Int = 20 + } + + var p = PointA() + ``` + + + +#### 计算属性（Computed Property） + +1. 本质是方法（函数） +2. 不占实例的内存 +3. 结构体、枚举、类都可以定义计算属性 + +Swift 中计算属性的规定 + +* set 传入的新默认值叫做 `newValue` , 也可以自定义。 + + ```swift + struct Circle { + // 存储属性 + var radius: Double + // 计算属性 + var diameter: Double { + set(newDiameter) { + radius = newDiameter / 2 + } + get { + radius * 2 + } + } + } + ``` + +* 只读属性：只有 `get`，没有 `set` + + ```swift + struct Circle { + // 存储属性 + var radius: Double + // 计算属性 + var diameter: Double { + get { + radius * 2 + } + } + } + ``` + +* 定义计算属性只能用 `var`, 不能用 `let` + +##### 枚举 rawValue 的原理 + +枚举原始值 `rawValue` 的本质是: 只读计算属性 + +#### 延迟存储属性 (Lazy Stored Property) + +使用 `lazy` 可以定义一个延迟存储属性，在第一次用到属性的时候才会进行初始化。 + +* `lazy` 属性必须是 `var` , 不能是 `let` + * `let` 必须在示例的初始化方法完成之前就拥有值 +* 如果多条线程同时第一次访问 `lazy` 属性 + * 无法保证属性只能被初始化 1 次的，是线程不安全的 + +```swift +class Car { + init() { + print("Car init!") + } + + func run() { + print("Car is running!") + } +} + +class Person { + lazy var car = Car() + init() { + print("Person init!") + } + + func goOut() { + car.run() + } +} + +let ps = Person() +print("-----------") +ps.goOut() +``` + +输出的结果 + +> Person init! +> +> \------------ +> +> Car init! +> Car is running! + +##### 延迟存储属性注意点 + +当结构体包含一个延迟存储属性时，只有 `var` 才能访问延迟存储属性 + +* 因为延迟属性初始化时需要改变结构体内存 + + jiulinxiri_20220109234238 + + + +#### 属性观察器(Property Observer) + +属性观察器类似于 OC 的 KVO，可以为非 `lazy` 的 `var` 存储属性设置观察器。 + +```swift +struct CircleA { + var radius: Double { + willSet { + print("willSet", newValue) + } + didSet { + print("didSet", oldValue, radius) + } + } + init() { + self.radius = 10 + print("Circle init!") + } +} + +// Circle init! +var circleA = CircleA() +// willSet 10.5 +// didSet 10.0 10.5 +circleA.radius = 10.5 +// 10.5 +print(circleA.radius) +``` + +> willSet、didSet 以及 set 方法是不能共存的，因此计算属性不能设置属性观察器 + +* `willSet` 会传递新值，默认叫 newValue +* `didSet` 会传递旧值，默认叫 oldValue +* 在初始化器中设置属性值不会触发 `willSet` 和 `didSet` + * 在属性定义时设置初始值不会触发 `willSet` 和 `didSet` + +#### 全局变量/局部变量 \ No newline at end of file diff --git a/10 属性 inout.playground/playground.xcworkspace/xcuserdata/jiulinxiri.xcuserdatad/UserInterfaceState.xcuserstate b/10 属性 inout.playground/playground.xcworkspace/xcuserdata/jiulinxiri.xcuserdatad/UserInterfaceState.xcuserstate index 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