iOS Copy

//遵守Copying, MutableCopying协议
@interface Person : NSObject <NSCopying， NSMutableCopying>
@property (nonatomic, copy) NSString *name;
@end

@implementation Person
//实现方法
- (id)copyWithZone:(NSZone *)zone
{
    Person *p = [[[self class] allocWithZone:zone] init];
    
    p.name = self.name;
    
    return p;
}

- (id)mutableCopyWithZone:(NSZone *)zone
{
    Person *p = [[[self class] allocWithZone:zone] init];
    
    p.name = self.name;
    
    return p;
}
@end