直接上代码，不BB。。用 playground编写！
import UIKit
//
var str = "Hello, playground"
//开发语言，面向对象
/*1.let 常量,这个不要点，我不知道是哪里来的，；不要结束符号，我不知道是那种语言
/
let string = "hello"
var a = 10
/
1.var 只是告诉编译器这个是一个变量，具体是什么类型还是要告诉编译器的
*/
var Scenes,scripts,sounds:String
let swfitone,swifttow:String
swfitone = "Something Just Like This , this is sing"
swifttow = "The is New swift String "
Scenes = "Test switf string practice Unity scenes"
scripts = "This is test unity Scripts Ptactice"
sounds = "I Don,t Understand This Varlable"
/*
这个是一个常量赋值过了，就不能修改了。！
swfitone = "time show paly"
if type Don,t Agree，Don,t JiSuan ,Swift No Support
如果类型不一致，不能直接计算，swfit 不支持自动类型转换
*/
var Myname,speed:NSInteger
speed = 10
//墙砖类型，跟oc是一样的。
var Myprice = Double(speed);
var stringtest = "YinShiShengm"
var StringtestTo:String = "XianShishengM";
//打印与C# 一致
print(Myprice)
//-----The Above Let Vat Statement Over -----
let Error = (404," Net Work Not Found")
//var DataSouer:String
print(Error.0)
let (code,status) = Error
print("code = (code)status = (status)")
//var Mystring:String?="8888"
//print(Mystring)
var Mystring :String? = "9999"
if var testChapao = Mystring{
print("如果有值就赋值，没有值就不赋值");
testChapao = Mystring!;
print(testChapao)
}else{
print("str是nil")//str不赋初始值时
}
/*
1.字符串方法
2.拼接,追加
*/
var stringT = "stringTest1"
var stringT2 = "stringTest2"
//相加
var stringcomporer = stringT+stringtest
//追加C字符
stringT.append(Character("G"))
//追加字符串
stringT.append("Srroy")
print("string == (stringT)")
//追加
var string5 = "(stringT)china"
print("string5 = (string5)")
//强转
var string6 = "100"
var string7 = "300"
//跟OC是一样的
var string8 = Int(string6)
var floatValue = Float(string7)
var string9 = String(floatValue!)
/*
1.在swfit里 所有的变量，用？修饰，并且没有初值，都是nil
2.? opitional 可选值，要么为nil
3.！拆包，如果要拿出变量的可选值，就必须拆包
4.在swfit中，如果声明一个变量，不用？或！修饰的话，他是没有值的，使用时会崩溃的
*/
//这样就定义了一个可选的int型
var Monye:Int? = 100
if Monye == nil {
print("没有值")
}else{
print("有值")
}
//如果要拿出来变量的值就必须拆包。
print(Monye!)
var Sugestring:String? = "88"
print(Sugestring!)
//如果是这样，就一定会有值！可以不用拿直接打印的
var discount:Float! = 3.5
print(discount)
var IntZh = Int(string5)
//Obcjet.isEmpty
if string5.isEmpty {
print("字符串为空")
}else{
print("字符串不为空")
}
if string7 == string5 {
print("字符串相等")
}else{
print("字符串不等")
}
string7.hasPrefix("string")
string7.hasSuffix("str")
//print(JsonData!)
//var jsonstr2 = String(JsonData!, String.Encoding.utf8)
//var jsonStr2 = String(data: JsonData!, String.Encoding.utf8)
//var Jsonsrt2 = String(Data:JsonData!,encoding:NSUTF8StringEncoding)
var Jsonstr = "stringDataholle"
var JsonData:Data? = Jsonstr.data(using: String.Encoding.utf8)
//这个为什么一定要拆包，我擦！
var sss:String! = String.init(data: JsonData!, encoding: String.Encoding.utf8)
var stringjsonself = sss
print(stringjsonself!)
//循环，向下转换，判断，switch
var view:UIView = UIImageView (frame: CGRect.init(x: 0, y: 0, width: 100, height: 100))
//as 还真的不知道怎么用，是什么意思
var imageview:UIImageView = view as! UIImageView
//这个是不能够 基本数据类型的
var obj:AnyObject = imageview
//这个才能弄基本数据类型
var objc:Any = "stringName"
print(objc)
//
//数组操作
//var arr1 = ["A","B","C","D",1,2]
//隐士转化基本上不行了，这是其他方法的实例化
var arrint:[Int] = [1,2,3,4]
var arrlintl:Array
var arrstring:Array
//arrstring.append("wudi")
//arrstring.append("TL")
arrstring.append("ssss")
arrstring.append("shenwukong")
arrstring.append(contentsOf: ["hehe","wukongz"])
for itmess in arrstring {
print(itmess)
}
//[]其实这个代表一个数组
var arrFloar:[Float] = Float
//，你可以像C#一样的
var Arrfloat:Array
//初始化方法，都是一样的，这个每个都是结构体了，
var arrstring1:[String] = Array.init(repeating: "wudi", count: 3)
let index:Int = arrstring1.startIndex
let count:Int = arrstring1.count
print("count = (count)")
arrstring1[0] = "Tlzuishai"
//移除全部元素
arrstring1.removeAll()
//判断是否为空
if arrstring.isEmpty {
print("empty")
}else{
print("No empty")
}
if arrstring1 == arrstring {
print("数组相等")
}else{
print("数组不相等")
}
//枚举
enum DeviceType{
case Iphone4
case iphone4s
case iphone5
case iphone5s
case iphone6
case iphone6s
case iphone7
case iphone7pules
}
var type = DeviceType.iphone7
if type == DeviceType.iphone7 {
print("是iphone 7")
}else{
print("不是iphone 7 ")
}
//字典，遍历
var arrdic:[String] = ["china","USA","Japan","ShangHai"]
//遍历时可以获取下标和值
for (indexs,vale2) in arrdic.enumerated() {
print("index==(indexs),values ==(vale2)")
}
//
var stringfor = "i lover MySelf"
//变量字符串
for temo in stringfor.characters {
print("forChai=(temo)")
}
//var dic:[Dictionary] = ["page":"1","money":"100",1:1]
var dic:[Int:Int] = [1:2,3:4]
var dic1:Dictionary
//实例化,要不前面给他 要不后面给他 实例化
var dic2 = Dictionary
var dic3:Dictionary
dic3.updateValue("Tl", forKey: 1.0)
print(dic3)
//他没有第一个0元素的
dic3[1] = nil
print(dic3)
dic3.removeValue(forKey: 1.0)
var Dic4:Dictionary
//获取每个key,获取字典的每个数值
var keys = Array(Dic4.keys)
for i in keys {
print("K = (i)")
}
var valuse = Array(Dic4.values)
for v in valuse {
print("valus = (v)")
}
for tmp in Dic4 {
print("key = (tmp.0)valus = (tmp.1)")
}
for (keys,valus2) in Dic4 {
print("key = (keys) valus2 = (valus2)")
}
//方法的声明
func test(){
print("这个跟C#一样")
}
test()
//函数名，参数,返回值
func Sum(a:Int,B:Int)->Int{
return a+B
}
var maxnumber = Sum(a: 10, B: 2)
print("maxnumber==(maxnumber)")
//返回多个数据类型
func Nax(a:Int,b:Int,c:Int)->(Int){
return a+b+c
}
func Min (a:Int,B:Int,C:Int)->(Int){
return a-B-C
}
func getMaxandMin(q:Int,W:Int,C:Int)->(Int,Int){
var CurrenMax = q
var CurrentMin = W
CurrenMax = Nax(a: W, b: q, c: C)
CurrentMin = Min(a: q, B: W, C: C)
return (CurrenMax,CurrentMin)
}
var (max1,min1) = getMaxandMin(q: 10, W: 1, C: 1)
print("max1 = (max1)")
print("min1 = (min1)")
//inout 在内部修改传过来的值
func getLnout (y:Int){
}
//下划线的使用,元祖 是一个类型
let point = (x:100,y:100,Z:100)
let (_,y,Z) = point
print("y = (y)")
print("z = (Z)")
var Ts:String? = "ssssss"
if var _ = Ts {
print("来了")
}else{
print("没有")
}