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 * ios/104048.html">ios/211915.html">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
