Swift学习笔记

Swift学习笔记

1. 输出：

   print()

2. 变量

   var a = 1

3. 常量

   let c = 2

4. 数据类型

   var str = "Hello "
   var s:String = "World"
   var i:Int = 10
   var words:String = "Hello World"
   print(str)

5. 字符串连接

   var str = "Hello "
   str = str + "World"
   var i = 100
   str = "\(str),abc,\(i)"
   print(str)

6. 数组

   var arr = ["Hello", "World", 100, 0.10]
   var arr1 = []

7. 字典

   var user = ["uid":1, "username":"admin", "password":"123456"]
   user["email"] = "admin@admin.com"
   print(user)
   print(user["email"])

8. 循环

9. 流程控制

10. 函数

    func sayHello(name:String){
    	print("Hello \(name)")
    }
    sayHello("admin")
    func getNums()->(Int, Int){
    	return(100, 200)
    }
    let (a, b) = getNums()
    print(a)
    var fun = sayHello
    fun("admin")

11. 面向对象

    class Hi{
        func sayHi(){
            print("Hello admin")
        }
    }
    class Hello:Hi{
        var _name:String
        init(name:String) {
            self._name = name
        }
        override func sayHi() {
            print("Hello \(self._name)")
        }
    }
    var hi = Hi()
    hi.sayHi()
    var hello = Hello(name: "admin")
    hello.sayHi()