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前言
說到保存用戶名和密碼，以前有用過本地的數據庫來保存，也接觸過用userdefault來保存，后來在一個項目中發現了一個新的方法——用Keychain來保存。下面話不多說了，直接通過示例代碼來介紹吧。
方法示例
一、新建一個LYKeychainTool類，導入系統Security框架 ，LYKeychainTool.h文件實現如下：
// // 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 /** * 儲存字符串到鑰匙串 * @param sValue 對應的Value * @param sKey 對應的Key */ + (void)saveKeychainValue:(NSString *)sValue key:(NSString *)sKey; /** * 從鑰匙串獲取字符串 * @param sKey 對應的Key * @return 返回儲存的Value */ + (NSString *)readKeychainValue:(NSString *)sKey; /** * 從鑰匙串刪除字符串 * @param sKey 對應的Key */ + (void)deleteKeychainValue:(NSString *)sKey; @end
二、LYKeychainTool.m文件實現如下：
//
// 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 調用
//
// 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:@"讀取到用戶名:%@",[LYKeychainTool readKeychainValue:@"userName"]];
self.passwordTextField.text = [NSString stringWithFormat:@"讀取到用戶密碼:%@",[LYKeychainTool readKeychainValue:@"password"]];
}
- (IBAction)deleteBtn:(id)sender {
[LYKeychainTool deleteKeychainValue:@"userName"];
[LYKeychainTool deleteKeychainValue:@"password"];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
四、效果如下圖：
總結
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