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：
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//// 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：
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//// 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
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//// 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，谢谢大家对服务器之家的支持。
原文链接：http://www.jianshu.com/p/85e122a2bf22
