Swfit初学3

/*-------我是帅气的分割线--------*/

/*-------   元组  -------*/

//let status: (Int,String) = (404,"Not Found")
//println("statusCode = (status.0)  statusMessage = (status.1)")   //  通过位置访问元组里面的元素

let status: (statusCode: Int,statusMessage: String) = (statusCode: 404,statusMessage: "Not Found") // 根据"姓名"即名称进行访问
println("statusCode = (status.statusCode) statusMessage = (status.statusMessage) ")


//元组分解
let (statusCode,statusMessage) = (404,"Not Found")
println("statusCode = (statusCode) statusMessage = (statusMessage)")



/*-------我是帅气的分割线--------*/

/*------------控制语句-------------*/

let firstSex = sexDic["公牛"]
let isGD = firstSex == "公"

if isGD {               //Swift判断只 接受BOOL值
    println("我是公牛")
}else{
    println("我是母牛")
}


/*-------我是帅气的分割线--------*/

//可选变量

let countStr = "33333"
//let countStr = "3333das3"  //为空
let count: Int? = countStr.toInt()    //toInt()方法返回一个Int类型的可选变量

//法1
if count{
    let realCount = count!  // ! 强制解析 (拆包)
    println("realCount = (realCount)")
}else{
    println("realCount = nil")
}

//法2    --------->>>> 先判断count是否有值,如果有值则把值给realCount,如果没有值则进入else分支
if let realCount = count{
    println("realCount = (realCount)")
}else{
    println("realCount = nil")
}




/*-------我是帅气的分割线--------*/

let point = (x:2,y:2)

switch(point){

case(0,0):
    println("point 是原点")
    
case(let x,0) where x == 2:             //条件语句
    println("point x= (x) y=0 在X轴上")
case(0,let y):
    
    println("point x= 0 y= (y)在Y轴上")
case(let x,let y):
    
    println("point 在其他区域")
}


switch(point) {
case(let x,let y) where x == y:
    println("该点在x=y这条线上")
case(let x,let y) where x == -y:
    println("该点在x=-y这条线上")
case(let x,let y):
    println("该点在x=y这条线上")
}


let number = 12
switch(number){
case 0...9:      //0...9是范围
    println("number 是一个一位数")
case 10...9:
    println("number 是一个二位数")
case 100...999:
    println("number 是一个二位数")
    fallthrough                 //相当于C语言中不加Break效果
default:
    println("number 既不是也不是")
}


/*-------我是帅气的分割线--------*/


let tempString = "yoipllkjgad"

tempName:for letter in tempString{

    switch(letter){
    case "a","e","i","o","u":
        
        println("letter 是一个元音字母")
        break tempName;   //------------------>>>>跳出for循环加一个标签
    default:
        println("letter 是一个辅音字母")
    }
}