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HaRi
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fix: 2017.7.12 今日更新: 1.Swift 语法补充; 2.Swift4.0 KVO, KVC;
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‎README.md‎

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@@ -42,14 +42,15 @@ Swift基础知识大全; Swift学习从简单到复杂; 不断地完善与更新
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- 协议
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- 扩展
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- 泛型
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- Swift语法补充
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- Swift4.0KVC和KVO
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### 今日更新
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- 协议补充
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- 扩展
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- 泛型
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- Swift语法补充
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- Swift4.0KVC和KVO
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## 更新中...
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基础语法补充: Swift 语法补充
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接下来开始解读 Swift项目之UIKit和Foundation相关框架!
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## Star

‎Swift4.0KVC和KVO/main.swift‎

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@@ -0,0 +1,67 @@
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//
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// main.swift
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// Swift4.0KVC和KVO
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//
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// Created by 韩俊强 on 2017/7/12.
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// Copyright © 2017年 HaRi. All rights reserved.
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//
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import Foundation
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/*
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Swift4语法 需要在xcode9 iOS11运行
14+
*/
15+
16+
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/*
18+
struct 也支持 KVC
19+
*/
20+
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/*
22+
struct ValueType {
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var name:String
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}
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var object = ValueType(name: "小韩哥")
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let name = \ValueType.name
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//set
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object[keyPath: name] = "Swift4"
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//get
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let valueOfName = object[keyPath:name]
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*/
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/*
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KVO: 目前依然只有 NSObject 才支持KVO
38+
*/
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//注意:被观察的属性需要用dynamic修饰，否则也无法观察到。
40+
//一个好消息是不需要在对象被回收时手动 remove observer。但是这也带来了另外一个容易被忽略的事情：观察的闭包没有被强引用，需要我们自己添加引用，否则当前函数离开后这个观察闭包就会被回收了。
41+
/*
42+
class OCClass: NSObject {
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dynamic var name:String
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init(name : String) {
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self.name = name
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}
47+
}
48+
49+
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func TestKVO() {
51+
var swiftClass : OCClass!
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var ob: NSKeyValueOperator!
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swiftClass = OCClass(name: "OC")
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ob = swiftClass.observe(\.name){
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(ob, changed) in
57+
let
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new = ob.name
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print(new)
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}
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swiftClass.name = "Swift4"
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}
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TestKVO()
64+
*/
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‎Swift基础语法大全.xcodeproj/project.pbxproj‎

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@@ -75,6 +77,24 @@
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@@ -399,6 +419,10 @@
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@@ -493,6 +517,20 @@
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@@ -765,6 +803,22 @@
765803
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767805
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816+
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819+
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820+
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768822
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769823
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770824
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@@ -1014,6 +1068,8 @@
10141068
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10151069
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10161070
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1071+
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10171073
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10191075
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@@ -1059,6 +1115,8 @@
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10601116
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10631121
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10641122
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@@ -1189,6 +1247,40 @@
11891247
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11901248
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1250+
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1262+
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1264+
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11941286
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@@ -1809,6 +1901,16 @@
18091901
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18101902
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18111903
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1904+
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1909+
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18121914
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@@ -2036,6 +2138,8 @@
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20412145
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@@ -2065,6 +2169,22 @@
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@@ -2402,6 +2522,42 @@
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2540+
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2541+
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2543+
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2549+
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2550+
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2552+
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31533309
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@@ -3384,6 +3556,7 @@
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‎Swift语法补充/main.swift‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,36 @@
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//
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// main.swift
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// Swift语法补充
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//
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// Created by 韩俊强 on 2017/7/12.
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// Copyright © 2017年 HaRi. All rights reserved.
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//
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import Foundation
10+
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/*
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断言: 当程序发生异常时, 如果希望找到出错位置并打印一个消息, 就可以使用断言, 即通过一个全局的函数 assert
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assert 接受一个闭包作为其第一个参数, 第二个参数是一个字符串; 假如第一个闭包返回的是一个false, 那么这个字符串就会被打印到中控制台上, assert格式如下:
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*/
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//assert(()-> Bool, "Message")
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// 如示例, 我们希望某个函数不为空, 如果为空则会使程序崩溃, 这时就可以使用assert, 当这个函数为空的时候, 会把后面的字符串打印到中控台, 这样就知道哪里出现问题了:
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//assert(someFunction() != nil, "someFunction 返回了空值! ")
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/*
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precondition: 它和 assert 的格式类型, 也是动态的, 它会造成程序的提前终止并抛出错误信息; 前面讲过, Swift 数组的下标操作可能造成越界, 使用扩展的方式向其中怎敢爱一个方法来判断下标是否越界:
24+
*/
25+
extension Array {
26+
func ifOutBounds(index:Int){
27+
precondition((0..<endIndex).contains(index), "数组越界")
28+
print("继续执行")
29+
}
30+
}
31+
[1,2,3].ifOutBounds(index: 2) // index == 3 会被提前终止
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//最后要注意: precondition 在一般代码中并不多见, 因为它是动态的, 只会在程序运行时进行检查; 适用于那些无法在编译器确定的风险情况;
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