比我说得好比我说得好比我说得好，重要的说三遍
http://blog.csdn.net/hello_hwc/article/details/50102329
下面是自己的理解
1、类赋值
class SomeClass {
var name : String?
var age = 25
}
var oneClass = SomeClass()
oneClass.name = "牛大胆"
print(oneClass.age)
print(oneClass.name!)
var twoClass = oneClass
twoClass.name = "狗指导"
print("\(twoClass.name!)+\(oneClass.name!)")
//对象比较用===
if twoClass === oneClass {
print("两个相等")
}
image.png
可以看出类的赋值var twoClass = oneClass是浅copy，拷贝了指针。
2、结构体赋值
struct SomeStruct {
var anyClass = SomeClass()
var company : String?
var salary = 10000
}
var oneStruct = SomeStruct()
oneStruct.company = "百得康"
var twoStruct = oneStruct
twoStruct.company = "双乾"
print("\(oneStruct.company!) -- \(twoStruct.company!)")
image.png
可以看出结构体的赋值var twoStruct = oneStruct是深copy，拷贝了value。
3、基本类型String和NSMutableArray举例
var companyName : String?
companyName = "双乾"
var companyName2 = companyName
companyName2 = "百得康"
print("\(companyName!)--\(companyName2!)")
var nameArray : NSMutableArray?
nameArray = ["双乾","百得康"]
var nameArray2 = nameArray
nameArray2!.add("联康")
print("\(nameArray!)--\(nameArray2!)")
print("%p--%p",nameArray!,nameArray2!)
image.png
