iphone 深拷贝，NSCopying

来源：互联网发布：手机淘宝修改评价内容编辑：程序博客网时间：2024/05/21 20:07

直接写代码：

头文件：

Member类，实现了深拷贝。

VIPMember类，是Member的子类，继承了Member的深拷贝协议。但VIP需要实现copyWithZone函数来实现拷贝。

@interface Member : NSObject<NSCopying>{    NSString *_name;}@property(nonatomic, retain)NSString *name;@end@interface VIPMember : Member {    NSString *_vipPhone;}@property (nonatomic, retain)NSString *vipPhone;@end

实现文件：

@implementation Member@synthesize name=_name;- (NSString*)description{    return [NSString stringWithFormat:@"<Member>{name:%@}", self.name];}- (void)dealloc{    [_name release];}- (id)copyWithZone:(NSZone *)zone{    Member * member = [[self class] allocWithZone:zone];    member.name = _name;    return member;}@end@implementation VIPMember@synthesize vipPhone=_vipPhone;- (NSString*)description{    NSString * str = [NSString stringWithFormat:@"<VIPMember>{member:%@,vipPhone:%@}",[super description], self.vipPhone];    return str;}- (void)dealloc{    [_vipPhone release];    [super dealloc];}- (id)copyWithZone:(NSZone *)zone{    VIPMember * vipMember = [super copyWithZone:zone];    vipMember.vipPhone = _vipPhone;    return vipMember;}@end

调用的方法：

    VIPMember * member1 = [[VIPMember alloc] init];    member1.name = @"wang";    member1.vipPhone = @"13422223333";    VIPMember * member2 = [member1 copy];    member2.name = @"zhang";    member2.vipPhone = @"13200009999";    NSLog(@"member1:%d, member2:%d", [member1 retainCount], [member2 retainCount]);    NSLog(@"member1:%@", member1);    NSLog(@"member2:%@", member2);

输出的日志：

member1:1, member2:1

member1:<VIPMember>{member:<Member>{name:wang},vipPhone:13422223333}

member2:<VIPMember>{member:<Member>{name:zhang},vipPhone:13200009999}