如何在Objective-C中复制对象

Question

我需要深度复制具有自己对象的自定义对象。我一直在阅读，对于如何继承NSCopying和如何使用NSCopyObject感到有些困惑。

Answer 1

苹果文档说copyWithZone：方法的子类版本应首先将消息发送给super，以合并其实现，除非该子类直接来自NSObject。添加到现有答案@interface YourClass : NSObject <NSCopying>&nbsp;{&nbsp; &nbsp;SomeOtherObject *obj;}// In the implementation-(id)copyWithZone:(NSZone *)zone{&nbsp; YourClass *another = [super copyWithZone:zone];&nbsp; another.obj = [obj copyWithZone: zone];&nbsp; return another;}