一、对系统自带类的copy与mutableCopy

总结：

对NSString

对NSMutableString

对NSArray

对NSMutableArray

对NSDictionary

对NSMutableDictionary

对NSSet

对NSMutableSet

二、自定义类的copy与mutableCopy

// Person.h

typedef NS_ENUM(NSInteger,PersonSex) {
    PersonSexMan,
    PersonSexWomen
};

@interface Person : NSObject<NSCopying,NSMutableCopying>
@property (nonatomic,copy,readonly) NSString *name;
@property (nonatomic,assign) NSInteger age;
@property (nonatomic,assign)  PersonSex sex;


- (instancetype)initWithName:(NSString *)name age:(NSInteger)age sex:(PersonSex)sex;
+ (instancetype)personWithName:(NSString *)name age:(NSInteger)age sex:(PersonSex)sex;

// Person.m

@implementation Person
- (instancetype)initWithName:(NSString *)name age:(NSInteger)age sex:(PersonSex)sex{
    if (self = [super init]) {
        _name = [name copy];
        _age = age;
        _sex = sex;
    }
    return self;
}

+ (instancetype)personWithName:(NSString *)name age:(NSInteger)age sex:(PersonSex)sex{
    return [[self alloc]initWithName:name age:age sex:sex];
}`
- (id)copyWithZone:(NSZone *)zone{
    Person *person = [[[self class] allocWithZone:zone] initWithName:_name age:_age sex:_sex];
    return person;
}
- (id)mutableCopyWithZone:(NSZone *)zone{
    Person *person = [[[self class] allocWithZone:zone] initWithName:_name age:_age sex:_sex];
    return person;
}
@end

对person进行copy和mutableCopy

        Person *person = [[Person alloc] initWithName:@"hao" age:23 sex:PersonSexMan];
        Person *personCopy = [person copy];
        Person *personMutableCopy = [person mutableCopy];
        
        NSLog(@"person: %p",person);
        NSLog(@"personCopy: %p",personCopy);
        NSLog(@"personMutableCopy: %p",personMutableCopy);

输出：

person: 0103200050
personCopy: 0x103200140
personMutableCopy: 0x103200200

copy与mutableCopy都进行了深拷贝。