iOS--KeyChina 簡單使用

標籤：

今天瞭解一下KeyChina,之前儲存的使用者資訊都放在NSUserDefaults,這樣很不安全,現在寫的話我會放在KeyChina中,因為他儲存的資訊還是比較安全的,Keychain的資訊是存在於每個應用（app）的沙箱之外的，所以keychain裡儲存的資訊不會因App被刪除而丟失，在使用者重新安裝App後依然有效，資料還在。(就是將一些敏感資訊,儲存起來);

接下來我們來簡單的整合一下吧,儲存使用者的帳號和密碼,還有其他用處,這裡並沒有介紹:

整合之前先說一下,KeyChina現在不支援ARC,所以需要我們手動的配置工程,在代碼中會有體現,

首先匯入系統的架構:

然後我們建立一個類:KeyChina;

.m:

#import <Foundation/Foundation.h>#import <Security/Security.h>@interface KeyChina : NSObject/** *  用KeyChaina去儲存使用者名稱和密碼 */+(void)save:(NSString *)service data:(id)data;/** *  從KeyChina取出使用者名稱和密碼 */+(id)load:(NSString *)service;/** *  從KeyChina中刪除使用者名稱和密碼 */+ (void)delete:(NSString *)service;@end

.h實現:

#import "KeyChina.h"@implementation KeyChina/** *  該類需要工作在mrc模式下,如果項目是arc,按照下面進行操作 *  選中工程->TARGETS->相應的target然後選中右側的“Build Phases”，向下就找到“Compile Sources”了。然後在相應的檔案後面添加:-fno-objc-arc參數 */+(NSMutableDictionary *)getKeychinaQuery:(NSString *)service{        return [NSMutableDictionary dictionaryWithObjectsAndKeys:(id)kSecClassGenericPassword, (id)kSecClass, service, (id)kSecAttrService, service, (id)kSecAttrAccount, (id)kSecAttrAccessibleAfterFirstUnlock, (id)kSecAttrAccessible, nil];    }#pragma mark -- 寫入+(void)save:(NSString *)service data:(id)data{        //Get search dictionary    NSMutableDictionary *keyChinaQuery = [self getKeychinaQuery:service];    //Delete old item before add new item    SecItemDelete((CFDictionaryRef)keyChinaQuery);    //Add new object to search dictionary(Attention:the data format)    [keyChinaQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];    //Add item to keychain with the search dictionary    SecItemAdd((CFDictionaryRef)keyChinaQuery, NULL);}#pragma mark -- 讀取+ (id)load:(NSString *)service{        id ret = nil;    NSMutableDictionary *keychinaQuery = [self getKeychinaQuery:service];    //Configure the search setting    //Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue    [keychinaQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];    [keychinaQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];        CFDataRef keyData = NULL;    if (SecItemCopyMatching((CFDictionaryRef)keychinaQuery, (CFTypeRef *)&keyData) == noErr) {        @try {            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(NSData *)keyData];        } @catch (NSException *e) {            NSLog(@"Unarchive of %@ failed: %@", service, e);        } @finally {        }    }    if (keyData)        CFRelease(keyData);        return ret;    }#pragma mark -- 刪除+(void)delete:(NSString *)service{    NSMutableDictionary *keychinaQuery = [self getKeychinaQuery:service];    SecItemDelete((CFDictionaryRef)keychinaQuery);}@end

在需要的地方調用:

#import "ViewController.h"#import "KeyChina.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    NSString * const KEY_USERNAME_PASSWORD = @"com.company.app.usernamepassword";    NSString * const KEY_USERNAME = @"com.company.app.username";    NSString * const KEY_PASSWORD = @"com.company.app.password";        NSMutableDictionary *userNamePasswordKVPairs = [NSMutableDictionary dictionary];    [userNamePasswordKVPairs setObject:@"userName" forKey:KEY_USERNAME];    [userNamePasswordKVPairs setObject:@"password" forKey:KEY_PASSWORD];    // A、將使用者名稱和密碼寫入keychain   [KeyChina save:KEY_USERNAME_PASSWORD data:userNamePasswordKVPairs];    // B、從keychain中讀取使用者名稱和密碼    NSMutableDictionary *readUsernamePassword = (NSMutableDictionary *)[KeyChina load:KEY_USERNAME_PASSWORD];    NSString *userName = [readUsernamePassword objectForKey:KEY_USERNAME];    NSString *password = [readUsernamePassword objectForKey:KEY_PASSWORD];    NSLog(@"username = %@", userName);    NSLog(@"password = %@", password);        // C、將使用者名稱和密碼從keychain中刪除    [KeyChina delete:KEY_USERNAME_PASSWORD];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.    }@end

OK了!!!

 

iOS--KeyChina 簡單使用