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ios登錄成功怎麽存儲用戶信息

KeyChain是蘋果提供的壹種安全的保存用戶名、密碼、證書的方式,將敏感信息保存在keychain中後,這些信息不會隨著app的卸載而丟失,除非開發人員在app中手動刪除敏感信息,否則,這些信息將會壹直保存在keychain中。

在使用keychain時,我們首先要將security.framework引入到工程中。由於使用時不支持arc,所以我們在arc環境中需要針對相關文件啟用mrc模式。

首先,我們構造壹個工具類,通過這個類來操作keychain。

#import

#import

@interface KeyChain : NSObject

// save username and password to keychain

+ (void)save:(NSString *)service data:(id)data;

// take out username and passwore from keychain

+ (id)load:(NSString *)service;

// delete username and password from keychain

+ (void)delete:(NSString *)service;

@end

在實現文件中,我們這樣寫:

#import "KeyChain.h"

@implementation KeyChain

/**

*該類需要工作在mrc模式下,acr的項目按照如下步驟操作

*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。然後在相應的文件後面添加:-fno-objc-arc參數

*

**/

+ (NSMutableDictionary *)getKeychainQuery:(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 *keychainQuery = [self getKeychainQuery:service];

//Delete old item before add new item

SecItemDelete((CFDictionaryRef)keychainQuery);

//Add new object to search dictionary(Attention:the data format)

[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];

//Add item to keychain with the search dictionary

SecItemAdd((CFDictionaryRef)keychainQuery, NULL);

}

#pragma mark 讀取

+ (id)load:(NSString *)service {

id ret = nil;

NSMutableDictionary *keychainQuery = [self getKeychainQuery: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

[keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];

[keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];

CFDataRef keyData = NULL;

if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (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 *keychainQuery = [self getKeychainQuery:service];

SecItemDelete((CFDictionaryRef)keychainQuery);

}

@end

修改工程的相關放在在代碼註釋中已經寫清楚了。

下邊是使用這個類

首先,我們定義幾個字符串類型的標識符

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";

之後,我們創建壹個字典,並將用戶名和密碼放入字典中

NSMutableDictionary *userNamePasswordKVPairs = [NSMutableDictionary dictionary];

[userNamePasswordKVPairs setObject:@"userName" forKey:KEY_USERNAME];

[userNamePasswordKVPairs setObject:@"password" forKey:KEY_PASSWORD];

下邊引用工具類的各個方法,分別進行用戶名和密碼的添加、讀取、刪除操作

// A、將用戶名和密碼寫入keychain

[KeyChain save:KEY_USERNAME_PASSWORD data:userNamePasswordKVPairs];

// B、從keychain中讀取用戶名和密碼

NSMutableDictionary *readUsernamePassword = (NSMutableDictionary *)[KeyChain load:KEY_USERNAME_PASSWORD];

NSString *userName = [readUsernamePassword objectForKey:KEY_USERNAME];

NSString *password = [readUsernamePassword objectForKey:KEY_PASSWORD];

NSLog(@"username = %@", userName);

NSLog(@"password = %@", password);

// C、將用戶名和密碼從keychain中刪除

[KeyChain delete:KEY_USERNAME_PASSWORD];

keychain的用法還有很多,我們在這裏只是簡單的將用戶名和密碼保存在keychain,而不是數據庫或nsuserdefaults中,以增加安全性。