不完全深拷贝要实现完全深拷贝

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需求：默认状态下深拷贝指的是不完全深拷贝, 如要实现完全深拷贝, 则要重写copyWithZone: 方法, 自行实现完全深拷贝的
实现：大体思路如下, 在copyWithZone: 里对象赋值上不直接赋值而是通过copy方法即可实现

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// Person.m
- (id)copyWithZone:(NSZone *)zone
{
    Person *cpyPerson = [[Person allocWithZone:zone] init];
    cpyPerson.name = self.name;
    cpyPerson.age = self.age;
    return cpyPerson;
}
// NSArray
- (id)copy
{
    NSArray *cpyArray = [[NSArray alloc] initWithArray:self copyItems:YES];
    return cpyArray;
}
// main.m
Person *p1 = [[Person alloc] init];
Person *p2 = [[Person alloc] init];
NSArray *array = @[p1, p2];
NSArray *cpyArray = [array copy];
NSLog(@"%@ - %@", array, cpyArray);
// 输出结果
(
    "",
    ""
) - (
    "",
    ""
)