Use struct to create a structure. Structures support many of the same behaviors as classes,including methods and initializers. One of the most important differences between structures and classes is that structures are always copied when they are passed around in your code,but classes are passed by reference.
上面这句话是官方文档的
我们可以看到结构的一些形式和类是基本相似的
但是他们有一个很大的区别就是，结构体是值引用，类的是址引用，可能这么说不太直观
我写了个例子，我们可以看一下
struct Hello {
var firstName:String
var secondName:String
func sayHello() -> Void {
print("Hello \(firstName) \(secondName)")
}
}
var hello = Hello(firstName: "Liu",secondName: "Mingchuan")
var hello_1 = hello
hello.sayHello()
hello.secondName = "Ryoma"
hello.sayHello()
hello_1.sayHello()
class Hello2 {
var firstName:String = ""
var secondName:String = ""
func sayHello() -> Void {
print("Hello \(firstName) \(secondName)")
}
}
var hello2 = Hello2()
var hello2_1=hello2
hello2.firstName = "Liu"
hello2.secondName = "Mingchuan"
hello2.sayHello()
hello2.secondName = "Ryoma"
hello2.sayHello()
输出
Hello Liu Mingchuan
Hello Liu Ryoma
Hello Liu Mingchuan
Hello Liu Mingchuan
Hello Liu Ryoma
Hello Liu Ryoma
