NSArray实现深拷贝

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我为我自定义的类，实现NSCopying协议，实现了深拷贝。

但是，我想对NSArray实现深拷贝！也就是说，我想把深拷贝和浅拷贝的理解（一）-Object-C

中的NSArray实现深拷贝！

难题来了，难道我要重写NSArray类，让其实现NSCopying协议嘛？！

也许，还有更好的办法吧！

当我学会了归档（archive）文件（二）

用NSData进行归档后，

我发现，可以用NSData提供的内存缓冲区，为NSArray实现深拷贝！

直接贴代码：

NSMutableArray *objArray=[NSMutableArray arrayWithObjects:

card1,

card2,

nil];

NSMutableArray *objArray2;

// NSData *data=[NSKeyedArchiver archivedDataWithRootObject:objArray];

// objArray2=[NSKeyedUnarchiver unarchiveObjectWithData:data];

objArray2=[NSKeyedUnarchiver unarchiveObjectWithData:[NSKeyedArchiverarchivedDataWithRootObject:objArray]];

// 输出objArray

NSLog(@"objArray: ");

for (AddressCard *theCard in objArray) {

[theCard print];

}

2012-12-09 22:07:11.536 DemoVideo[608:1b803] objArray:

2012-12-09 22:07:11.536 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.536 DemoVideo[608:1b803] name=Tom

2012-12-09 22:07:11.536 DemoVideo[608:1b803] email=Tom@yahoo.cn

2012-12-09 22:07:11.537 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.537 DemoVideo[608:1b803] name=LiLei

2012-12-09 22:07:11.537 DemoVideo[608:1b803] email=LiLei@yahoo.cn

2012-12-09 22:07:11.537 DemoVideo[608:1b803] =====================

// 输出objArray2

NSLog(@"objArray2: ");

for (AddressCard *theCard in objArray2) {

[theCard print];

}

2012-12-09 22:07:11.538 DemoVideo[608:1b803] objArray2:

2012-12-09 22:07:11.538 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.538 DemoVideo[608:1b803] name=Tom

2012-12-09 22:07:11.538 DemoVideo[608:1b803] email=Tom@yahoo.cn

2012-12-09 22:07:11.538 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.539 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.540 DemoVideo[608:1b803] name=LiLei

2012-12-09 22:07:11.540 DemoVideo[608:1b803] email=LiLei@yahoo.cn

2012-12-09 22:07:11.540 DemoVideo[608:1b803] =====================

// 修改了objArray中的第一个元素

AddressCard *tempCard=[objArray objectAtIndex:0];

tempCard.name=@"CarBoon";

tempCard.email=@"CarBoon@yahoo.cn";

// 输出objArray

NSLog(@"objArray: ");

for (AddressCard *theCard in objArray) {

[theCard print];

}

2012-12-09 22:07:11.541 DemoVideo[608:1b803] objArray:

2012-12-09 22:07:11.541 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.541 DemoVideo[608:1b803] name=CarBoon

2012-12-09 22:07:11.541 DemoVideo[608:1b803] email=CarBoon@yahoo.cn

2012-12-09 22:07:11.541 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.542 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.542 DemoVideo[608:1b803] name=LiLei

2012-12-09 22:07:11.543 DemoVideo[608:1b803] email=LiLei@yahoo.cn

2012-12-09 22:07:11.543 DemoVideo[608:1b803] =====================

// 输出objArray2

NSLog(@"objArray2: ");

for (AddressCard *theCard in objArray2) {

[theCard print];

}

2012-12-09 22:07:11.544 DemoVideo[608:1b803] objArray2:

2012-12-09 22:07:11.544 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.544 DemoVideo[608:1b803] name=Tom

2012-12-09 22:07:11.545 DemoVideo[608:1b803] email=Tom@yahoo.cn

2012-12-09 22:07:11.545 DemoVideo[608:1b803] =====================

2012-12-09 22:07:11.545 DemoVideo[608:1b803] name=LiLei

2012-12-09 22:07:11.546 DemoVideo[608:1b803] email=LiLei@yahoo.cn

2012-12-09 22:07:11.546 DemoVideo[608:1b803] =====================

因为在归档/反归档过程中产生的是全新副本！并且在内存中完成！

以后，要生成一个对象的深拷贝时，如果该对象不支持NSCopying协议时，可以用这种方法来实现深拷贝！

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