https://github.com/dulingkang/wwdcnote
WWDC note every year.
https://github.com/dulingkang/wwdcnote
Last synced: about 1 year ago
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WWDC note every year.
- Host: GitHub
- URL: https://github.com/dulingkang/wwdcnote
- Owner: dulingkang
- License: mit
- Created: 2015-12-19T04:51:18.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2015-12-19T06:52:50.000Z (over 10 years ago)
- Last Synced: 2025-02-03T21:59:05.961Z (over 1 year ago)
- Language: Swift
- Size: 11.7 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# WWDCNote
WWDC note every year.
> 新特性：基本类型、类型匹配、可检查性、协议扩展、错误处理
---
## 基本类型
###枚举
```
enum Animals {
case Dog, Cat, Troll, Dragon
}
let a = Animals.Dragon
```
- 在枚举中加入类型:
```
enum Either {
case First(T1)
case Second(T2)
}
```
- 递归枚举
递归枚举中需要加入indirect修饰：
```
enum Tree {
case Leaf(T)
indirect case Node(Tree, Tree)
}
```
### do 用法
```
do {
let a = Animals.Troll
print(a)
}
```
repeat ... while:
```
repeat {
let a = Animals.Dog
print(a)
} while(false)
```
### Option Sets
```
var viewAnimationOptions: UIViewAnimationOptions = [.Repeat, .CurveEaseIn, .TransitionCurlUp]
viewAnimationOptions = []
if viewAnimationOptions.contains(.TransitionCurlUp) {
}
```
- 定义一个Option Set
```
struct MyFontStyle: OptionSetType {
let rawValue: Int
static let Bold = MyFontStyle(rawValue: 1)
static let Italic = MyFontStyle(rawValue: 2)
static let Underline = MyFontStyle(rawValue: 4)
static let Strikethrogh = MyFontStyle(rawValue: 8)
}
var myFont: MyFontStyle = []
myFont = [.Underline]
myFont = [.Bold, .Italic]
if myFont.contains(.Strikethrogh) {
print("yes")
}
```
### 函数和方法
- 所有函数的定义都是一样的，调用时，第一个label隐藏，以后的Label会显示：
```
class Widget {
func save(name: String, encrypt: Bool) {
}
}
let widget = Widget()
widget.save("go", encrypt: true)
```
- 如果如果想让第一个函数Label显示出来，可以这样：
```
func save(name name: String, encrypt: Bool) {}
widget.save(name: "go", encrypt: false)
```
- 如果想让哪一个参数隐藏，可以在label前面加_和一个空格：
```
func save(name name: String, _ encrypt: Bool) {}
widget.save(name: "go", false)
```
### 警告给出提示
- 在结构体中定义的函数中，如果更改了结构体中的变量，需要用mutating修饰函数：
```
struct MyCoordinates {
var points: [CGPoint]
mutating func updatePoint() {
points[20].x = 20
}
}
```
- var和let的提示，不变的变量用let，使用中会给变量赋值的用var
## 类型匹配
用guard来确保存在：
```
func process(json: AnyObject) -> Either {
guard let name = json["name"] as? String,
let year = json["year"] as? Int else {
return .Second("bad input")
}
print(name, year)
}
```
- 用switch类型匹配
```
switch bar() {
case .MyEnumCase(let value):where value != 42:
doThing(value)
default: break
}
```
可以这样写：
```
if case .MyEnumCase(let value) = bar() where value != 42 { doThing(value)
}
```
- for ... in
未完待续。。。
## 可检查性
## 协议扩展
## 错误处理