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SSKeyChains對apple平安框架API停止了復雜封裝，支持對存儲在鑰匙串中密碼、賬戶停止訪問，包括讀取、刪除和設置；

在工程中參加SSKeyChain

在工程中參加Security.framework框架。把SSKeychain.h和SSKeychain.m加到項目文件夾。

SSKeyChain所需文件 點擊下載

運用SSKeyChain

經過以下類辦法來運用SSKeyChain（請檢查SSKeyChain.h）：

+ (NSArray *)allAccounts;
+ (NSArray *)accountsForService:(NSString *)serviceName;
+ (NSString *)passwordForService:(NSString *)serviceName account:(NSString *)account;
+ (BOOL)deletePasswordForService:(NSString *)serviceName account:(NSString *)account;
+ (BOOL)setPassword:(NSString *)password forService:(NSString *)serviceName account:(NSString *)account;

==Demo

#import "SSKeychain.h"  
static NSString *kSSToolkitTestsServiceName = @"SSToolkitTestService";  
static NSString *kSSToolkitTestsAccountName = @"SSToolkitTestAccount";  
static NSString *kSSToolkitTestsPassword = @"SSToolkitTestPassword";  
@interface SSKeychainTests : SenTestCase  
- (BOOL)_accounts:(NSArray *)accounts containsAccountWithName:(NSString *)name;  
@end  

@implementation SSKeychainTests  
- (void)testAll {  
 //留意：setPassword    就是詳細要存儲的值
    // Getting & Setings Passwords  
    //設置密碼和賬戶名    
    [SSKeychain setPassword:@"123" forService:kSSToolkitTestsServiceName account:kSSToolkitTestsAccountName];  
    //獲取密碼  
    NSString *password = [SSKeychain passwordForService:kSSToolkitTestsServiceName account:kSSToolkitTestsAccountName];  
    NSLog(@"%@",password);  
    STAssertEqualObjects(password, @"123", @"Password reads and writes");  
    NSLog(@"============");  
    // Getting Accounts  
    //獲取一切賬號  
    NSArray *accounts = [SSKeychain allAccounts];  
    STAssertTrue([self _accounts:accounts containsAccountWithName:kSSToolkitTestsAccountName], @"All accounts");  
    NSLog(@"==11==%@",accounts);  
    //獲取以後服務下的賬號名  
    accounts = [SSKeychain accountsForService:kSSToolkitTestsServiceName];  
    NSLog(@"==22==%@",accounts);  
    STAssertTrue([self _accounts:accounts containsAccountWithName:kSSToolkitTestsAccountName], @"Account for service");  
    // Deleting Passwords  
    //刪除以後賬戶的密碼  
    [SSKeychain deletePasswordForService:kSSToolkitTestsServiceName account:kSSToolkitTestsAccountName];  
    //獲取以後賬號的密碼  
    password = [SSKeychain passwordForService:kSSToolkitTestsServiceName account:kSSToolkitTestsAccountName];  
    STAssertNil(password, @"Password deletes");  
}  
- (BOOL)_accounts:(NSArray *)accounts containsAccountWithName:(NSString *)name {  
    for (NSDictionary *dictionary in accounts) {  
        if ([[dictionary objectForKey:@"acct"] isEqualToString:name]) {  
            return YES;  
        }  
    }  
    return NO;  
}  

假如你保管密碼失敗，會有這樣的提示：

NSError *error = nil;  
NSString *password = [SSKeychain passwordForService:@"MyService" account:@"samsoffes" error:&error];  
  
if ([error code] == SSKeychainErrorNotFound) {  
    NSLog(@"Password not found");  
}  

留意: setPassword和passwordForSevice辦法中的services 和 accounts 參數應該是分歧的。

另外附上一篇寫得更詳細的e文：http://useyourloaf.com/blog/2010/3/29/simple-iphone-keychain-Access.html

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