iOS中利用KeyChain保存用户信息的方法示例
程序员文章站
2023-12-22 08:14:40
前言
说到保存用户名和密码,以前有用过本地的数据库来保存,也接触过用userdefault来保存,后来在一个项目中发现了一个新的方法——用keychain来保存。下面话不...
前言
说到保存用户名和密码,以前有用过本地的数据库来保存,也接触过用userdefault来保存,后来在一个项目中发现了一个新的方法——用keychain来保存。下面话不多说了,直接通过示例代码来介绍吧。
方法示例
一、新建一个lykeychaintool类,导入系统security框架 ,lykeychaintool.h文件实现如下:
// // lykeychaintool.h // keychaintest // // created by liyu on 2017/6/2. // copyright © 2017年 liyu. all rights reserved. // #import <foundation/foundation.h> #import <security/security.h> @interface lykeychaintool : nsobject /** * 储存字符串到钥匙串 * @param svalue 对应的value * @param skey 对应的key */ + (void)savekeychainvalue:(nsstring *)svalue key:(nsstring *)skey; /** * 从钥匙串获取字符串 * @param skey 对应的key * @return 返回储存的value */ + (nsstring *)readkeychainvalue:(nsstring *)skey; /** * 从钥匙串删除字符串 * @param skey 对应的key */ + (void)deletekeychainvalue:(nsstring *)skey; @end
二、lykeychaintool.m文件实现如下:
// // lykeychaintool.m // keychaintest // // created by liyu on 2017/6/2. // copyright © 2017年 liyu. all rights reserved. // #import "lykeychaintool.h" @implementation lykeychaintool + (nsmutabledictionary *)getkeychainquery:(nsstring *)service { return [nsmutabledictionary dictionarywithobjectsandkeys: (__bridge_transfer id)ksecclassgenericpassword, (__bridge_transfer id)ksecclass,service, (__bridge_transfer id)ksecattrservice,service, (__bridge_transfer id)ksecattraccount, (__bridge_transfer id)ksecattraccessibleafterfirstunlock, (__bridge_transfer id)ksecattraccessible, nil]; } + (void)savekeychainvalue:(nsstring *)svalue key:(nsstring *)skey { nsmutabledictionary * keychainquery = [self getkeychainquery:skey]; secitemdelete((__bridge_retained cfdictionaryref)keychainquery); [keychainquery setobject:[nskeyedarchiver archiveddatawithrootobject:svalue] forkey:(__bridge_transfer id)ksecvaluedata]; secitemadd((__bridge_retained cfdictionaryref)keychainquery, null); } + (nsstring *)readkeychainvalue:(nsstring *)skey { nsstring *ret = nil; nsmutabledictionary *keychainquery = [self getkeychainquery:skey]; [keychainquery setobject:(id)kcfbooleantrue forkey:(__bridge_transfer id)ksecreturndata]; [keychainquery setobject:(__bridge_transfer id)ksecmatchlimitone forkey:(__bridge_transfer id)ksecmatchlimit]; cfdataref keydata = null; if (secitemcopymatching((__bridge cfdictionaryref)keychainquery, (cftyperef *)&keydata) == noerr) { @try { ret = (nsstring *)[nskeyedunarchiver unarchiveobjectwithdata:(__bridge nsdata *)keydata]; } @catch (nsexception *e) { nslog(@"unarchive of %@ failed: %@", skey, e); } @finally { } } if (keydata) cfrelease(keydata); return ret; } + (void)deletekeychainvalue:(nsstring *)skey { nsmutabledictionary *keychainquery = [self getkeychainquery:skey]; secitemdelete((__bridge cfdictionaryref)keychainquery); } @end
三、viewcontroller 调用
// // viewcontroller.m // keychaintest // // created by liyu on 2017/6/2. // copyright © 2017年 liyu. all rights reserved. // #import "viewcontroller.h" #import "lykeychaintool.h" @interface viewcontroller () @property (weak, nonatomic) iboutlet uitextfield *usernametextfield; @property (weak, nonatomic) iboutlet uitextfield *passwordtextfield; @end @implementation viewcontroller - (void)viewdidload { [super viewdidload]; } - (ibaction)savebtn:(id)sender { [lykeychaintool savekeychainvalue:self.usernametextfield.text key:@"username"]; [lykeychaintool savekeychainvalue:self.passwordtextfield.text key:@"password"]; } - (ibaction)readebtn:(id)sender { self.usernametextfield.text = [nsstring stringwithformat:@"读取到用户名:%@",[lykeychaintool readkeychainvalue:@"username"]]; self.passwordtextfield.text = [nsstring stringwithformat:@"读取到用户密码:%@",[lykeychaintool readkeychainvalue:@"password"]]; } - (ibaction)deletebtn:(id)sender { [lykeychaintool deletekeychainvalue:@"username"]; [lykeychaintool deletekeychainvalue:@"password"]; } - (void)didreceivememorywarning { [super didreceivememorywarning]; } @end
四、效果如下图:
总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对的支持。