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iOS集合类深拷贝

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iOS集合类默认是浅拷贝，那如何深拷贝呢？

1.集合类的浅拷贝:

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NSMutableArray *newNames =  [[NSMutableArray alloc] initWithArray:names];

2.集合类的深拷贝:

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NSMutableArray *newNames =  [[NSMutableArray alloc] initWithArray:names copyItems:YES];

3.特殊场景下的集合类真正的深拷贝:

如果对于集合类中含有集合类的情况呢？ 要实现真正的深拷贝,可以通过序列化(archive)和反序列化(unarchive)该集合类。

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NSArray* trueDeepCopyArray = [NSKeyedUnarchiver unarchiveObjectWithData:
                                      [NSKeyedArchiver archivedDataWithRootObject:names]];

但是，这种代价相比较而言比较高，慎用!

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