函数
func
1 func sayHelloSwift()
2 {
3 print(“Hello, Swift！”)
4 }
1 func sum(number1：Int, number2：Int)->Int
2 {
3 return number1 + number2
4 }
num1:Int,String ->Int
return ((number1 < number2)？number1：number2)
Bool
Int
String
返回元组
1 func getUserInfo(userId：String) -> (userName：String,
userLevel：Int, photoPath：String)
2 {
3 let userName = “John”
4 let userLevel = 3
5 let photoPath =
“http：//www.coolketang.com/userPhoto/323sfa4.png”
6
7 return (userName, userLevel, photoPath)
8 }
内置函数
abs
min
max
filter
1 for i in (1……10).filter({0 * 3})
2 {
3 print(i)
4 }
reduce
1 let result = (1……4).reduce(0, combine：{1})
2 print(result) //输出结果：10
1 let result = (1……4).reduce(0, combine：*)
2 print(result) //输出结果：24
枚举 enum
1 enum UserLevel
2 {
3 case 总经理
4 case 区域经理
5 case 主管
6 case 业务员
7 }
enum
1 let userLevel = UserLevel.业务员
2 switch userLevel
3 {
4 case UserLevel.总经理：
5 print(“总经理登录系统后，进入系统配置页面。”)
6 case UserLevel.区域经理：
7 print(“区域经理登录系统后，进入区域报表页面。”)
8 case UserLevel.主管：
9 print(“主管登录系统后，进入业务员任务签发页面。”)
10 case UserLevel.业务员：
11 print(“业务员登录系统后，进入报备客户页面。”)
12 default：
13 print(“无法进入客户报备页面，请重新登录！”)
14 }
enum
1 enum Gender：UInt8
2 {
3 case Male = 1
4 case Female = 2
5 case Unknow = 3
6 }
结构 struct
1 struct Animal {
2 let zooName：String = “Beijing Zoo”
3 var name：String
5 func say()
6 {
7 print(“Hi, I’m (name).”)
8 }
9 }
类 class
1 class Car
2 {
3 var brand：String
4 var speed：Int
5 init()
6 {
7 self.brand = ””
8 self.speed = 0
9 }
10 init(brand：String, speed：Int)
11 {
12 self.brand = brand
13 self.speed = speed
14 }
}
初始化
1 let car = Car()
2 car.brand = “Audi”
3 car.speed = 80
属性同时设置：
class A{
4 var level：Int
5 {
6 get
7 {
8 return self.damage / 10
9 }
10 set(newLevel)
11 {
12 self.damage = newLevel * 10
13 }
14 }
}
类方法：class func xx(n1:Int,n2:Int)->Int
1 class MathTool
2 {
3 class func sum(number1：Int, number2：Int) -> Int
4 {
5 return number1 + number2
6 }
7 class func multiply(number1：Int, number2：Int) -> Int
8 {
9 return number1 * number2
10 }
11 }
析构函数
deinit
{
print(“Delete the fileManager.”)
}
继承：class Dog：Animal
重载：override func say()
父类初始化；super.init(name:name)
延迟加载：lazy
5 class User
6 {
7 var name：String = “John”
8 lazy var avarta：Avarta = Avarta()
9 }
类型判断：if ix is Int
类型转换：xx as Int
任何类型数组：var sa=Any
1 var anythings = Any
2 anythings.append(8)
3 anythings.append(3.1415)
4 anythings.append(“hello”)
5 anythings.append((3.0, 5.0))
结构扩展： extends Cat
接口类：protocol
protocol Walking
{
var damage:Int{get set}
func walk()
}
空值：nil
var password：String？
print(password？.characters.count)
属性的willSet didSet
1 class Hero
2 {
3 var damage：Int = 10
4 var level：Int = 1
5 {
6 willSet
7 {
8 print(“即将为level设置新值：(newValue)。”)
9 }
10 didSet
11 {
12 if level>oldValue
13 {
14 print(“你的英雄升级了！”)
15 }
16 else
17 {
18 print(“挑战失败，英雄未能升级。”)
19 }
20 }
21 }
22 }