iOS 使用Keychain 保存用户名和密码到本地

之前曾把一些简单的数据保存在了plist,文件，及NsuserDefault里面，

但是如果要保存密码之类的，保存在本地就很不安全了；

但是利用 Keychain 我们可以很安全的把用户密码等信息保存在本地

1：使用苹果官方封装好的Keychain操作类

2：使用开源的keychain操作

#import <XCTest/XCTest.h>

#import "SSKeychain.h"

static NSString *const kSSKeychainServiceName = @"SSToolkitTestService";

static NSString *const kSSKeychainAccountName = @"SSToolkitTestAccount";

static NSString *const kSSKeychainPassword = @"SSToolkitTestPassword";

static NSString *const kSSKeychainLabel = @"SSToolkitLabel";

@interface SSKeychainTests : XCTestCase

@end

@implementation SSKeychainTests

- (void)testNewItem {

    // New item

    SSKeychainQuery *query = [[SSKeychainQuery alloc] init];

    query.password = kSSKeychainPassword;

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    query.label = kSSKeychainLabel;

    NSError *error;

    XCTAssertTrue([query save:&error], @"Unable to save item: %@", error);

    // Look up

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    query.password = nil;

    XCTAssertTrue([query fetch:&error], @"Unable to fetch keychain item: %@", error);

    XCTAssertEqualObjects(query.password, kSSKeychainPassword, @"Passwords were not equal");

    // Search for all accounts

    query = [[SSKeychainQuery alloc] init];

    NSArray *accounts = [query fetchAll:&error];

    XCTAssertNotNil(accounts, @"Unable to fetch accounts: %@", error);

    XCTAssertTrue([self _accounts:accounts containsAccountWithName:kSSKeychainAccountName], @"Matching account was not returned");

    // Check accounts for service

    query.service = kSSKeychainServiceName;

    accounts = [query fetchAll:&error];

    XCTAssertNotNil(accounts, @"Unable to fetch accounts: %@", error);

    XCTAssertTrue([self _accounts:accounts containsAccountWithName:kSSKeychainAccountName], @"Matching account was not returned");

    // Delete

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    XCTAssertTrue([query deleteItem:&error], @"Unable to delete password: %@", error);

}

- (void)testPasswordObject {

    SSKeychainQuery *query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    NSDictionary *dictionary = @{@"number": @, @"string": @"Hello World"};

    query.passwordObject = dictionary;

    NSError *error;

    XCTAssertTrue([query save:&error], @"Unable to save item: %@", error);

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    query.passwordObject = nil;

    XCTAssertTrue([query fetch:&error], @"Unable to fetch keychain item: %@", error);

    XCTAssertEqualObjects(query.passwordObject, dictionary, @"Passwords were not equal");

}

- (void)testMissingInformation {

    SSKeychainQuery *query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    NSError *error;

    XCTAssertFalse([query save:&error], @"Function should return NO as not all needed information is provided: %@", error);

    query = [[SSKeychainQuery alloc] init];

    query.password = kSSKeychainPassword;

    query.account = kSSKeychainAccountName;

    XCTAssertFalse([query save:&error], @"Function should return NO as not all needed information is provided: %@", error);

    query = [[SSKeychainQuery alloc] init];

    query.password = kSSKeychainPassword;

    query.service = kSSKeychainServiceName;

    XCTAssertFalse([query save:&error], @"Function save should return NO if not all needed information is provided: %@", error);

}

- (void)testDeleteWithMissingInformation {

    SSKeychainQuery *query = [[SSKeychainQuery alloc] init];

    query.account = kSSKeychainAccountName;

    NSError *error;

    XCTAssertFalse([query deleteItem:&error], @"Function deleteItem should return NO if not all needed information is provided: %@", error);

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    XCTAssertFalse([query deleteItem:&error], @"Function deleteItem should return NO if not all needed information is provided: %@", error);

    // check if fetch handels missing information correctly

    query = [[SSKeychainQuery alloc] init];

    query.account = kSSKeychainAccountName;

    XCTAssertFalse([query fetch:&error], @"Function fetch should return NO if not all needed information is provided: %@", error);

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    XCTAssertFalse([query fetch:&error], @"Function fetch should return NO if not all needed information is provided: %@", error);

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    XCTAssertFalse([query fetch:NULL], @"Function fetch should return NO if not all needed information is provided and error is NULL");

}

- (void)testSynchronizable {

    SSKeychainQuery *query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    query.password = kSSKeychainPassword;

    query.synchronizationMode = SSKeychainQuerySynchronizationModeYes;

    NSError *error;

    XCTAssertTrue([query save:&error], @"Unable to save item: %@", error);

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    query.password = nil;

    query.synchronizationMode = SSKeychainQuerySynchronizationModeNo;

    XCTAssertFalse([query fetch:&error], @"Fetch should fail when trying to fetch an unsynced password that was saved as synced: %@", error);

    XCTAssertFalse([query fetch:NULL], @"Fetch should fail when trying to fetch an unsynced password that was saved as synced. error == NULL");

    XCTAssertNotEqualObjects(query.password, kSSKeychainPassword, @"Passwords should not be equal when trying to fetch an unsynced password that was saved as synced.");

    query = [[SSKeychainQuery alloc] init];

    query.service = kSSKeychainServiceName;

    query.account = kSSKeychainAccountName;

    query.password = nil;

    query.synchronizationMode = SSKeychainQuerySynchronizationModeAny;

    XCTAssertTrue([query fetch:&error], @"Unable to fetch keychain item: %@", error);

    XCTAssertEqualObjects(query.password, kSSKeychainPassword, @"Passwords were not equal");

}

// Test Class Methods of SSKeychain

- (void)testSSKeychain {

    NSError *error = nil;

    // create a new keychain item

    XCTAssertTrue([SSKeychain setPassword:kSSKeychainPassword forService:kSSKeychainServiceName account:kSSKeychainAccountName error:&error], @"Unable to save item: %@", error);

    // check password

    XCTAssertEqualObjects([SSKeychain passwordForService:kSSKeychainServiceName account:kSSKeychainAccountName], kSSKeychainPassword, @"Passwords were not equal");

    // check all accounts

    XCTAssertTrue([self _accounts:[SSKeychain allAccounts] containsAccountWithName:kSSKeychainAccountName], @"Matching account was not returned");

    // check account

    XCTAssertTrue([self _accounts:[SSKeychain accountsForService:kSSKeychainServiceName] containsAccountWithName:kSSKeychainAccountName], @"Matching account was not returned");

    // delete password

    XCTAssertTrue([SSKeychain deletePasswordForService:kSSKeychainServiceName account:kSSKeychainAccountName error:&error], @"Unable to delete password: %@", error);

    // set password and delete it without error function

    XCTAssertTrue([SSKeychain setPassword:kSSKeychainPassword forService:kSSKeychainServiceName account:kSSKeychainAccountName], @"Unable to save item");

    XCTAssertTrue([SSKeychain deletePasswordForService:kSSKeychainServiceName account:kSSKeychainAccountName], @"Unable to delete password");

#if __IPHONE_4_0 && TARGET_OS_IPHONE

    [SSKeychain setAccessibilityType:kSecAttrAccessibleWhenUnlockedThisDeviceOnly];

    XCTAssertTrue([SSKeychain accessibilityType] == kSecAttrAccessibleWhenUnlockedThisDeviceOnly, @"Unable to verify accessibilityType");

#endif

}

#pragma mark - Private

- (BOOL)_accounts:(NSArray *)accounts containsAccountWithName:(NSString *)name {

    for (NSDictionary *dictionary in accounts) {

        if ([[dictionary objectForKey:@"acct"] isEqualToString:name]) {

            return YES;

        }

    }

    return NO;

}

@end

UICKeyChainStore

#import <XCTest/XCTest.h>

#import "UICKeyChainStore.h"

@interface UICKeyChainStoreTests : XCTestCase {

    NSString *kStubKey;

    NSString *kStubString;

    NSString *kStubService;

}

@end

@implementation UICKeyChainStoreTests

- (void)setUp

{

    [super setUp];

    kStubKey = @"password";

    kStubString = @"password1234";

    kStubService = @"com.kishikawakatsumi";

    [UICKeyChainStore setDefaultService:kStubService];

    [UICKeyChainStore removeAllItems];

}

- (void)tearDown

{

    [super tearDown];

}

- (void)testSetDefaultService

{

    NSString *serviceName = @"com.kishikawakatsumi.UICKeyChainStore";

    [UICKeyChainStore setDefaultService:serviceName];

    XCTAssertEqualObjects(serviceName, [UICKeyChainStore defaultService], @"specitfy default service name");

}

- (void)testInitializers

{

    UICKeyChainStore *store = nil;

    store = [UICKeyChainStore keyChainStore];

    XCTAssertEqualObjects(store.service, [UICKeyChainStore defaultService], @"instantiate default store");

    store = [[UICKeyChainStore alloc] init];

    XCTAssertEqualObjects(store.service, [UICKeyChainStore defaultService], @"instantiate default store");

    NSString *serviceName = @"com.kishikawakatsumi.UICKeyChainStore";

    store = [UICKeyChainStore keyChainStoreWithService:serviceName];

    XCTAssertEqualObjects(store.service, serviceName, @"instantiate custom service named store");

}

- (void)testSetData

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    NSData *usernameData = [username dataUsingEncoding:NSUTF8StringEncoding];

    NSData *passwordData = [password dataUsingEncoding:NSUTF8StringEncoding];

    [UICKeyChainStore setData:[username dataUsingEncoding:NSUTF8StringEncoding] forKey:usernameKey];

    [UICKeyChainStore setData:[password dataUsingEncoding:NSUTF8StringEncoding] forKey:passwordKey];

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:usernameKey], usernameData, @"stored username");

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:passwordKey], passwordData, @"stored password");

    [UICKeyChainStore removeItemForKey:usernameKey service:[UICKeyChainStore defaultService]];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"removed username");

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:passwordKey], passwordData, @"left password");

    [UICKeyChainStore removeItemForKey:passwordKey service:[UICKeyChainStore defaultService]];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"removed username");

    XCTAssertNil([UICKeyChainStore dataForKey:passwordKey], @"removed password");

}

- (void)testSetDataWithNoError

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    NSData *usernameData = [username dataUsingEncoding:NSUTF8StringEncoding];

    NSData *passwordData = [password dataUsingEncoding:NSUTF8StringEncoding];

    NSError *error;

    [UICKeyChainStore setData:[username dataUsingEncoding:NSUTF8StringEncoding] forKey:usernameKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:usernameKey error:&error], usernameData, @"stored username");

    XCTAssertNil(error, @"no error");

    [UICKeyChainStore setData:[password dataUsingEncoding:NSUTF8StringEncoding] forKey:passwordKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:passwordKey error:&error], passwordData, @"stored password");

    XCTAssertNil(error, @"no error");

    [UICKeyChainStore removeItemForKey:usernameKey service:[UICKeyChainStore defaultService] error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey error:&error], @"removed username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:passwordKey error:&error], passwordData, @"left password");

    XCTAssertNil(error, @"no error");

    [UICKeyChainStore removeItemForKey:passwordKey service:[UICKeyChainStore defaultService] error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey error:&error], @"removed username");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore dataForKey:passwordKey error:&error], @"removed password");

    XCTAssertNil(error, @"no error");

}

- (void)testSetNilData

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    NSData *usernameData = [username dataUsingEncoding:NSUTF8StringEncoding];

    NSData *passwordData = [password dataUsingEncoding:NSUTF8StringEncoding];

    [UICKeyChainStore setData:nil forKey:usernameKey];

    [UICKeyChainStore setData:nil forKey:passwordKey];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"no username");

    XCTAssertNil([UICKeyChainStore dataForKey:passwordKey], @"no password");

    [UICKeyChainStore setData:[username dataUsingEncoding:NSUTF8StringEncoding] forKey:usernameKey];

    [UICKeyChainStore setData:[password dataUsingEncoding:NSUTF8StringEncoding] forKey:passwordKey];

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:usernameKey], usernameData, @"stored username");

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:passwordKey], passwordData, @"stored password");

    [UICKeyChainStore setData:nil forKey:usernameKey];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"removed username");

    XCTAssertEqualObjects([UICKeyChainStore dataForKey:passwordKey], passwordData, @"left password");

    [UICKeyChainStore setData:nil forKey:passwordKey];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"removed username");

    XCTAssertNil([UICKeyChainStore dataForKey:passwordKey], @"removed password");

    [UICKeyChainStore removeItemForKey:usernameKey];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"removed username");

    XCTAssertNil([UICKeyChainStore dataForKey:passwordKey], @"removed password");

    [UICKeyChainStore removeItemForKey:passwordKey];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"removed username");

    XCTAssertNil([UICKeyChainStore dataForKey:passwordKey], @"removed password");

}

- (void)testSetUsernameAndPassword

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    UICKeyChainStore *store = [UICKeyChainStore keyChainStore];

    [store removeAllItems];

    [UICKeyChainStore setString:username forKey:usernameKey];

    [UICKeyChainStore setString:password forKey:passwordKey];

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:usernameKey], username, @"stored username");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey], password, @"stored password");

    XCTAssertEqualObjects([store stringForKey:usernameKey], username, @"stored username");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"stored password");

    [UICKeyChainStore removeItemForKey:usernameKey];

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey], @"removed username");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey], password, @"left password");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"left password");

    [UICKeyChainStore removeItemForKey:passwordKey];

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey], @"removed username");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey], @"removed password");

    XCTAssertNil([store stringForKey:usernameKey], @"removed username");

    XCTAssertNil([store stringForKey:passwordKey], @"removed password");

}

- (void)testSetUsernameAndPasswordWithNoError

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    NSError *error;

    UICKeyChainStore *store = [UICKeyChainStore keyChainStore];

    [store removeAllItemsWithError:&error];

    XCTAssertNil(error, @"no error");

    [UICKeyChainStore setString:username forKey:usernameKey error:&error];

    XCTAssertNil(error, @"no error");

    [UICKeyChainStore setString:password forKey:passwordKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:usernameKey error:&error], username, @"stored username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey error:&error], password, @"stored password");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:usernameKey error:&error], username, @"stored username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:passwordKey error:&error], password, @"stored password");

    XCTAssertNil(error, @"no error");

    [UICKeyChainStore removeItemForKey:usernameKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey error:&error], @"removed username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey error:&error], password, @"left password");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:passwordKey error:&error], password, @"left password");

    XCTAssertNil(error, @"no error");

    [UICKeyChainStore removeItemForKey:passwordKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey error:&error], @"removed username");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey error:&error], @"removed password");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([store stringForKey:usernameKey error:&error], @"removed username");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([store stringForKey:passwordKey error:&error], @"removed password");

    XCTAssertNil(error, @"no error");

}

- (void)testSetNilUsernameAndNilPassword

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    UICKeyChainStore *store = [UICKeyChainStore keyChainStore];

    [store removeAllItems];

    [UICKeyChainStore setString:nil forKey:usernameKey];

    [UICKeyChainStore setString:nil forKey:passwordKey];

    XCTAssertNil([UICKeyChainStore dataForKey:usernameKey], @"no username");

    XCTAssertNil([UICKeyChainStore dataForKey:passwordKey], @"no password");

    [UICKeyChainStore setString:username forKey:usernameKey];

    [UICKeyChainStore setString:password forKey:passwordKey];

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:usernameKey], username, @"stored username");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey], password, @"stored password");

    XCTAssertEqualObjects([store stringForKey:usernameKey], username, @"stored username");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"stored password");

    [UICKeyChainStore setString:nil forKey:usernameKey];

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey], @"removed username");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey], password, @"left password");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"left password");

    [UICKeyChainStore setString:nil forKey:passwordKey];

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey], @"removed username");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey], @"removed password");

    XCTAssertNil([store stringForKey:usernameKey], @"removed username");

    XCTAssertNil([store stringForKey:passwordKey], @"removed password");

}

- (void)testSynchronize1

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    NSString *serviceName = @"com.example.UICKeyChainStore";

    [UICKeyChainStore removeAllItemsForService:serviceName];

    UICKeyChainStore *store = [UICKeyChainStore keyChainStoreWithService:serviceName];

    [store removeAllItems];

    [store setString:username forKey:usernameKey];

    [store setString:password forKey:passwordKey];

    XCTAssertEqualObjects([store stringForKey:usernameKey], username, @"stored username");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"stored password");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey service:serviceName], @"not synchronized yet");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName], @"not synchronized yet");

    [store synchronize];

    XCTAssertEqualObjects([store stringForKey:usernameKey], username, @"stored username");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"stored password");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:usernameKey service:serviceName], username, @"stored username");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey service:serviceName], password, @"stored password");

    [store removeItemForKey:usernameKey];

    XCTAssertNil([store stringForKey:usernameKey], @"removed username");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"left password");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey service:serviceName], @"removed username");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey service:serviceName], password, @"left password");

    [store removeItemForKey:passwordKey];

    XCTAssertNil([store stringForKey:passwordKey], @"removed password");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName], @"removed password");

}

- (void)testSynchronize2

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    NSString *serviceName = @"com.example.UICKeyChainStore";

    [UICKeyChainStore removeAllItemsForService:serviceName];

    UICKeyChainStore *store = [UICKeyChainStore keyChainStoreWithService:serviceName];

    [store removeAllItems];

    [store setString:username forKey:usernameKey];

    [store setString:password forKey:passwordKey];

    XCTAssertEqualObjects([store stringForKey:usernameKey], username, @"stored username");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"stored password");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey service:serviceName], @"not synchronized yet");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName], @"not synchronized yet");

    [store removeItemForKey:usernameKey];

    XCTAssertNil([store stringForKey:usernameKey], @"removed username");

    XCTAssertEqualObjects([store stringForKey:passwordKey], password, @"left password");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey service:serviceName], @"not synchronized yet");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName], @"not synchronized yet");

    [store removeItemForKey:passwordKey];

    XCTAssertNil([store stringForKey:passwordKey], @"removed password");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName], @"not synchronized yet");

    [store synchronize];

    XCTAssertNil([store stringForKey:usernameKey], @"removed username");

    XCTAssertNil([store stringForKey:passwordKey], @"removed password");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey service:serviceName], @"removed username");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName], @"removed password");

}

- (void)testSynchronizeWithNoError

{

    NSString *usernameKey = @"username";

    NSString *passwordKey = @"password";

    NSString *username = @"kishikawakatsumi";

    NSString *password = @"password1234";

    NSString *serviceName = @"com.example.UICKeyChainStore";

    NSError *error;

    [UICKeyChainStore removeAllItemsForService:serviceName error:&error];

    XCTAssertNil(error, @"no error");

    UICKeyChainStore *store = [UICKeyChainStore keyChainStoreWithService:serviceName];

    [store removeAllItemsWithError:&error];

    XCTAssertNil(error, @"no error");

    [store setString:username forKey:usernameKey error:&error];

    XCTAssertNil(error, @"no error");

    [store setString:password forKey:passwordKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:usernameKey error:&error], username, @"stored username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:passwordKey error:&error], password, @"stored password");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey service:serviceName error:&error], @"not synchronized yet");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName error:&error], @"not synchronized yet");

    XCTAssertNil(error, @"no error");

    [store synchronizeWithError:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:usernameKey error:&error], username, @"stored username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:passwordKey error:&error], password, @"stored password");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:usernameKey service:serviceName error:&error], username, @"stored username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey service:serviceName error:&error], password, @"stored password");

    XCTAssertNil(error, @"no error");

    [store removeItemForKey:usernameKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertNil([store stringForKey:usernameKey error:&error], @"removed username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([store stringForKey:passwordKey error:&error], password, @"left password");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore stringForKey:usernameKey service:serviceName error:&error], @"removed username");

    XCTAssertNil(error, @"no error");

    XCTAssertEqualObjects([UICKeyChainStore stringForKey:passwordKey service:serviceName error:&error], password, @"left password");

    XCTAssertNil(error, @"no error");

    [store removeItemForKey:passwordKey error:&error];

    XCTAssertNil(error, @"no error");

    XCTAssertNil([store stringForKey:passwordKey error:&error], @"removed password");

    XCTAssertNil(error, @"no error");

    XCTAssertNil([UICKeyChainStore stringForKey:passwordKey service:serviceName error:&error], @"removed password");

    XCTAssertNil(error, @"no error");

}

- (void)testClassMethodsSetAndRemoveItem

{

    // write to keychain

    [UICKeyChainStore setString:kStubString forKey:kStubKey];

    // read from keychain, test keychain contains item

    NSString *actualString = [UICKeyChainStore stringForKey:kStubKey];

    NSString *expectedString = kStubString;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    // remove item from keychain

    [UICKeyChainStore removeItemForKey:kStubKey];

    // read from keychain, test keychain doesn't contain item

    actualString = [UICKeyChainStore stringForKey:kStubKey];

    expectedString = NULL;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

}

- (void)testClassMethodsSetAndRemoveItemWithNoError

{

    NSError *error;

    [UICKeyChainStore setString:kStubString forKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    NSString *actualString = [UICKeyChainStore stringForKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    NSString *expectedString = kStubString;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    // remove item from keychain

    [UICKeyChainStore removeItemForKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    // read from keychain, test keychain doesn't contain item

    actualString = [UICKeyChainStore stringForKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    expectedString = NULL;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

}

- (void)testInstanceMethodsSetAndRemoveItem

{

    // create an instance

    UICKeyChainStore *store = [UICKeyChainStore keyChainStoreWithService:kStubService];

    // write to keychain

    [store setString:kStubString forKey:kStubKey];

    [store synchronize];

    // read from keychain, test keychain contains item

    NSString *actualString = [store stringForKey:kStubKey];

    NSString *expectedString = kStubString;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    // remove item from keychain

    [store removeItemForKey:kStubKey];

    [store synchronize];

    // read from keychain, test keychain doesn't contain item

    actualString = [store stringForKey:kStubKey];

    expectedString = NULL;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    actualString = [store description];

    expectedString = @"(\n)";

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

}

- (void)testInstanceMethodsSetAndRemoveItemWithNoError

{

    NSError *error;

    UICKeyChainStore *store = [UICKeyChainStore keyChainStoreWithService:kStubService];

    [store setString:kStubString forKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    [store synchronizeWithError:&error];

    XCTAssertNil(error, @"no error");

    NSString *actualString = [store stringForKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    NSString *expectedString = kStubString;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    [store removeItemForKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    [store synchronizeWithError:&error];

    XCTAssertNil(error, @"no error");

    actualString = [store stringForKey:kStubKey error:&error];

    XCTAssertNil(error, @"no error");

    expectedString = NULL;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    actualString = [store description];

    expectedString = @"(\n)";

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

}

- (void)testInstanceMethodsSetAndRemoveWithNilValue

{

    UICKeyChainStore *store = [UICKeyChainStore keyChainStoreWithService:kStubService];

    [store setString:kStubString forKey:kStubKey];

    [store synchronize];

    NSString *actualString = [store stringForKey:kStubKey];

    NSString *expectedString = kStubString;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    [store setString:nil forKey:kStubKey];

    [store synchronize];

    actualString = [store stringForKey:kStubKey];

    expectedString = NULL;

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

    actualString = [store description];

    expectedString = @"(\n)";

    XCTAssertEqualObjects(expectedString, actualString,

                          @"expected %@ but got %@", expectedString, actualString);

}

- (void)testObjectSubscripting

{

    // create an instance

    UICKeyChainStore *store = [UICKeyChainStore keyChainStoreWithService:kStubService];

    // write to keychain using obj subscripting

    store[kStubKey] = kStubString;

    [store synchronize];

    NSString *actualString = store[kStubKey];

    NSString *expectedString = kStubString;

    // read from keychain using obj subscripting

    XCTAssertEqualObjects(expectedString, actualString, @"expected %@ but got %@", expectedString, actualString);

    store[kStubKey] = nil;

    [store synchronize];

    actualString = store[kStubKey];

    expectedString = NULL;

    XCTAssertEqualObjects(expectedString, actualString, @"expected %@ but got %@", expectedString, actualString);

}

@end

3：其他一参考版本

http://stackoverflow.com/questions/5247912/saving-email-password-to-keychain-in-ios

注意使用 keychain 要导入 Security.framework

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