swift 类和结构体

struct SForm{
    var iXX:Int = 99
    var strHello:String = "dsf"
    func testFunc(iXX:Int)->Int{
        return iXX+1
    }
}

class CTset{
    var iAge:Int = 9
    var strName:String = "xx"
    func testFunction(iAge:Int)->Int{
        return iAge+1
    }
    func testFunctionName(strName:String)->String{
        return "oo"+strName
    }
}

var structObj = SForm()
structObj.iXX = 988
let iRes = structObj.testFunc(4)

let clsObj = CTset()
clsObj.iAge = 987
let iRe:Int = clsObj.testFunction(32)
let iStr:String = clsObj.testFunctionName("sdf")

var objFirst = SForm(iXX:983, strHello:"hel")
objFirst.iXX = 87

let objSecond = SForm(iXX:94, strHello:"hwxel")
//objSecond.iXX = 876 error

var objFirst = SForm(iXX:983, strHello:"hel")
var objSecond = objFirst
objSecond.iXX = 5775
println("objFirst: \(objFirst.iXX)  objSecond:\(objSecond.iXX)")
输出：objFirst: 983  objSecond:5775

let clsObj = CTset()
clsObj.iAge = 987
var clsObjEx:CTset = clsObj
clsObjEx.iAge = 874
println("\(clsObj.iAge)  \(clsObjEx.iAge)")
输出：clsObj: 874 clsObjEx: 874

let clsObj = CTset()
clsObj.iAge = 987
var clsObjEx:CTset = clsObj
clsObjEx.iAge = 874
if clsObj === clsObjEx {
    println("obj same")
}

var dicFirst:Dictionary = ["key1":"value1", "key2":"value2"]
var dicSecond:Dictionary = dicFirst
dicSecond["key1"] = "value1Update"
dicSecond的值被更新，而dicFirst的值依然保持不变。dicFirst和dicSecond是两个独立的字典。它的key和value在赋值时候发生了拷贝，因为都是String类型。

class CTset{
    var iAge:Int = 9
    var strName:String = "xx"
    func testFunction(iAge:Int)->Int{
        return iAge+1
    }
    func testFunctionName(strName:String)->String{
        return "oo"+strName
    }
}

var clsObjFirst = CTset()
clsObjFirst.iAge = 443
var dicFirst:Dictionary = ["key1":clsObjFirst]
var dicSecond:Dictionary = dicFirst两个字典dicFirst 和 dicSecond分别为不同的字典，但它的值 clsObjFirst的地址却是同一个。因为它是类类型，是引用传递。

var arrayFirst = [1, 33]
var arraySecond = arrayFirst
arraySecond[0] = 89
//arrayFirst[0]和arraySecond[0] 都会被修改成 89 因为数组长度没变化，所以没发生拷贝

var arrayFirst = [1, 33]
var arraySecond = arrayFirst
arrayFirst.append(222)//长度变化，arrayFirst拷贝，独立另外一个数组
arrayFirst[0] = 99
println("first:\(arrayFirst)\nsecond:\(arraySecond)")
输出：
first:[99, 33, 222]
second:[1, 33]