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
我们就可以看到结构体的hello改变属性之后,hello_1的属性并没有改变
而类的就不同了,当hello2的属性变调之后,hello2_1的属性也变了
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。