类的copy和deepcopy
- (instancetype)initWithName:(NSString *)name
age:(NSUInteger)age
sex:(CYLSex)sex {
if(self = [super init]) {
_name = [name copy];
_age = age;
_sex = sex;
_friends = [[NSMutableSet alloc] init];
}
return self;
}
- (void)setName:(NSString *)name {
_name = [name copy];
}
- (id)copyWithZone:(NSZone *)zone {
CYLUser *copy = [[[self class] allocWithZone:zone]
initWithName:_name
age:_age
sex:_sex];
copy->_friends = [_friends mutableCopy];
return copy;
}
- (id)deepCopy {
CYLUser *copy = [[[self class] allocWithZone:zone]
initWithName:_name
age:_age
sex:_sex];
copy->_friends = [[NSMutableSet alloc] initWithSet:_friends
copyItems:YES];
return copy;
}