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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
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