From 5934fb2aea3bc3060354dd43bc8048f47a1ccca7 Mon Sep 17 00:00:00 2001
From: jiulinxiri <jiulinxiri@hotmail.com>
Date: Fri, 7 Jan 2022 22:16:23 +0800
Subject: [PATCH] =?UTF-8?q?=E9=97=AD=E5=8C=85=E5=B1=9E=E6=80=A7?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 08 类.playground/Resources/README.md         |   8 ++
 09 闭包.playground/Contents.swift           | 121 ++++++++++++++++++
 09 闭包.playground/contents.xcplayground    |   4 +
 .../contents.xcworkspacedata                  |   7 +
 .../UserInterfaceState.xcuserstate            | Bin 0 -> 11922 bytes
 10 属性 inout.playground/Contents.swift     |  20 +++
 .../Resources/README.md                       |  32 +++++
 .../contents.xcplayground                     |   4 +
 .../contents.xcworkspacedata                  |   7 +
 .../UserInterfaceState.xcuserstate            | Bin 0 -> 14675 bytes
 10 files changed, 203 insertions(+)
 create mode 100644 09 闭包.playground/Contents.swift
 create mode 100644 09 闭包.playground/contents.xcplayground
 create mode 100644 09 闭包.playground/playground.xcworkspace/contents.xcworkspacedata
 create mode 100644 09 闭包.playground/playground.xcworkspace/xcuserdata/jiulinxiri.xcuserdatad/UserInterfaceState.xcuserstate
 create mode 100644 10 属性 inout.playground/Contents.swift
 create mode 100644 10 属性 inout.playground/Resources/README.md
 create mode 100644 10 属性 inout.playground/contents.xcplayground
 create mode 100644 10 属性 inout.playground/playground.xcworkspace/contents.xcworkspacedata
 create mode 100644 10 属性 inout.playground/playground.xcworkspace/xcuserdata/jiulinxiri.xcuserdatad/UserInterfaceState.xcuserstate

diff --git a/08 类.playground/Resources/README.md b/08 类.playground/Resources/README.md
index 1ceb02c..91a660b 100644
--- a/08 类.playground/Resources/README.md	
+++ b/08 类.playground/Resources/README.md	
@@ -142,3 +142,11 @@ var p = Point()  class_getInstanceSize(type(of: p)) // 40
 class_getInstanceSize(Point.self) // 40
 ```
 
+#### 对象中的方法
+
+方法占用对象的内存吗？
+
+* 不占用
+* 方法的本质是函数
+* 方法以及函数都放在代码段
+
diff --git a/09 闭包.playground/Contents.swift b/09 闭包.playground/Contents.swift
new file mode 100644
index 0000000..2d081d0
--- /dev/null
+++ b/09 闭包.playground/Contents.swift	
@@ -0,0 +1,121 @@
+import UIKit
+
+var greeting = "Hello, playground"
+
+/*:
+  swift 中可以通过 func 定义一个函数，也可以通过闭包表达式创建一个函数。
+  
+  闭包表达式（Closure Expression）
+  - 闭包表达式的格式
+    {
+        (参数列表) -> 返回值类型 in
+        函数体代码
+    ｝
+ 
+  - 闭包表达式的简写
+  
+  尾随闭包: 尾随闭包是一个被书写在函数调用括号外面（后面）的闭包表达式
+  - 如果将一个很长的闭包表达式作为函数的最后一个实参，使用尾随闭包可以增强函数的可读性
+  - 如果闭包表达式是函数的唯一实参，而且使用了尾随闭包的语法，那就不需要在函数名后边写圆括号
+ 
+
+ 闭包(Closure)
+ - 一个函数和它所捕获的变量\常量环境组合起来，称为闭包
+   - 一般指定义在函数内部的函数
+   - 一般它捕获的是外层函数的局部变量\常量
+ 
+ - 可以把闭包想象成是一个类的实例对象
+   - 内存在堆空间
+   - 捕获的局部变量\常量就是对象的成员（存储属性）
+   - 组成闭包的函数就是类内部定义的方法
+    
+     class Closure {
+         var num = 0
+         func plus(_ i: Int) -> Int {  num += i
+            return num
+         }
+     }
+     var cs1 = Closure()
+     var cs2 = Closure()
+     cs1.plus(1) // 1
+     cs2.plus(2) // 2
+     cs1.plus(3) // 4
+     cs2.plus(4) // 6
+     cs1.plus(5) // 9
+     cs2.plus(6) // 12
+
+    
+ */
+
+// 闭包表达式
+var fn = {
+    (v1: Int, v2: Int) -> Int in
+    return v1 + v2
+}
+
+print(fn(10, 20))
+
+// 尾随闭包
+// 闭包表达式作为函数的最后一个实参
+func exec(v1: Int, v2: Int, fn:(Int, Int) -> Int) {
+    print(fn(v1, v2))
+}
+
+exec(v1: 10, v2: 20) {
+    $0 + $1
+}
+
+// 闭包表达式是函数的唯一实参
+func exec1(fn:(Int, Int) -> Int) {
+    print(fn(1, 2))
+}
+
+exec1(fn: {$0 + $1})
+exec1() {$0 + $1}
+exec1{$0 + $1}
+
+// 闭包
+typealias Fn = (Int) -> Int
+func getFn() -> Fn {
+    var num = 0
+    func plus(_ i: Int) -> Int {  num += i
+        return num
+    }
+    return plus
+} // 返回的plus和num形成了闭包
+
+var fn1 = getFn() // 分配堆空间
+var fn2 = getFn() // 分配另外的堆空间
+fn1(1) // 1
+fn2(2) // 2
+fn1(3) // 4
+fn2(4) // 6
+fn1(5) // 9
+fn2(6) // 12
+
+// 自动闭包
+/*:
+ @autoclosure 会自动将 20 封装成闭包 { 20 }
+ @autoclosure 只支持 () -> T 格式的参数
+ @autoclosure 并非只支持最后1个参数
+ 空合并运算符 ?? 使用了 @autoclosure 技术
+ 有@autoclosure、无@autoclosure，构成了函数重载
+ */
+// 如果第1个数大于0，返回第一个数。否则返回第2个数
+func getFirstPositive(_ v1: Int, _ v2: Int) -> Int {
+    return v1 > 0 ? v1 : v2
+}
+getFirstPositive(10, 20) // 10
+getFirstPositive(-2, 20) // 20
+getFirstPositive(0, -4) // -4
+
+// 改成函数类型的参数，可以让v2延迟加载
+func getFirstPositive(_ v1: Int, _ v2: () -> Int) -> Int? {
+    return v1 > 0 ? v1 : v2()
+}
+getFirstPositive(-4) { 20 }
+
+func getFirstPositive(_ v1: Int, _ v2: @autoclosure () -> Int) -> Int? {  return v1 > 0 ? v1 : v2()
+}
+getFirstPositive(-4, 20)
+
diff --git a/09 闭包.playground/contents.xcplayground b/09 闭包.playground/contents.xcplayground
new file mode 100644
index 0000000..cf026f2
--- /dev/null
+++ b/09 闭包.playground/contents.xcplayground	
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' buildActiveScheme='true' importAppTypes='true'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/09 闭包.playground/playground.xcworkspace/contents.xcworkspacedata b/09 闭包.playground/playground.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..ca3329e
--- /dev/null
+++ b/09 闭包.playground/playground.xcworkspace/contents.xcworkspacedata	
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:">
+   </FileRef>
+</Workspace>
diff --git a/09 闭包.playground/playground.xcworkspace/xcuserdata/jiulinxiri.xcuserdatad/UserInterfaceState.xcuserstate b/09 闭包.playground/playground.xcworkspace/xcuserdata/jiulinxiri.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
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diff --git a/10 属性 inout.playground/Contents.swift b/10 属性 inout.playground/Contents.swift
new file mode 100644
index 0000000..dc81a8a
--- /dev/null
+++ b/10 属性 inout.playground/Contents.swift	
@@ -0,0 +1,20 @@
+import UIKit
+
+
+struct Circle {
+    // 存储属性
+    var radius: Double
+    // 计算属性
+    var diameter: Double {
+        set {
+            radius = newValue / 2
+        }
+        get {
+            radius * 2
+        }
+    }
+}
+
+var circle = Circle(radius: 5)
+print(circle.radius)
+print(circle.diameter)
diff --git a/10 属性 inout.playground/Resources/README.md b/10 属性 inout.playground/Resources/README.md
new file mode 100644
index 0000000..9f56c87
--- /dev/null
+++ b/10 属性 inout.playground/Resources/README.md	
@@ -0,0 +1,32 @@
+### 属性
+
+Swift 中实例相关的属性分为两大类
+
+* 存储属性
+* 计算属性
+
+```swift
+struct Circle {
+  // 存储属性
+  var radius: Double 
+  // 计算属性
+  var diameter: Double { 
+    set {
+    	radius = newValue / 2 
+    }
+    get {
+    	radius * 2 
+    }
+  } 
+}
+```
+
+
+
+#### 存储属性（Stored Property）
+
+1. 类似于成员变量
+2. 存储在实例的内存中
+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
+
diff --git a/10 属性 inout.playground/contents.xcplayground b/10 属性 inout.playground/contents.xcplayground
new file mode 100644
index 0000000..cf026f2
--- /dev/null
+++ b/10 属性 inout.playground/contents.xcplayground	
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' buildActiveScheme='true' importAppTypes='true'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/10 属性 inout.playground/playground.xcworkspace/contents.xcworkspacedata b/10 属性 inout.playground/playground.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..ca3329e
--- /dev/null
+++ b/10 属性 inout.playground/playground.xcworkspace/contents.xcworkspacedata	
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:">
+   </FileRef>
+</Workspace>
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
new file mode 100644
index 0000000000000000000000000000000000000000..2e9ca926dac0df41c97ea191a0dc78dc7d923630
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