Swift对象拷贝

Swift对象拷贝

方法一:实现NSCopying协议

class Resume: NSObject, NSCopying {
    var name: String
    var sex: String?
    var age: String?
    var timeArea: String?
    var company: String?
    
    //必须要有一个required的初始化方法
    required init(name: String) {
        self.name = name
    }
    
    func copy(with zone: NSZone? = nil) -> Any {
        let obj = type(of: self).init(name: name)
        obj.sex = sex
        obj.age = age
        obj.timeArea = timeArea
        obj.company = company
        return obj
    }
}

使用:
let ben = Resume.init(name: "本初")
var shu = ben.copy() as! Resume

方法二:实现自定义拷贝协议

protocol Copyable {
    func copied() -> Self
}

class Book: Copyable {
    var name: String
    var author: String?
    var publish: String?
    
    //必须要有一个required的初始化方法
    required init(name: String) {
        self.name = name
    }
    
    func copied() -> Self {
        let obj = type(of: self).init(name: name)
        obj.name = name
        obj.author = author
        obj.publish = publish
        return obj
    }
}

使用:
let sanguo = Book.init(name: "three of kingdom")
let book = sanguo.copied()