如何在钥匙串 iOS 中保存 UUID？

Question

我是 iOS 开发的新手，我想将我的应用程序 UUID 存储在 KeyChain 中，所以在我的应用程序 UUID 保持不变的任何时候，我都会对其进行研发并从该站点查找代码，我弄乱了 StackOver Flow代码就像

+(NSUUID *)persistentIdentifierForVendor
{
static NSString * const kKeyChainVendorID = @"co.cwbrn.PersistentIdentifier";
static NSString * const kKeyChainVendorIDAccessGroup = @"<AppIdentifier>.<keychain-access-group-identifier>";

// First, check NSUserDefaults so that we're not hitting the KeyChain every single time
NSString *uuidString = [[NSUserDefaults standardUserDefaults] stringForKey:kKeyChainVendorIDGroup];
BOOL vendorIDMissingFromUserDefaults = (uuidString == nil || uuidString.length == 0);

if (vendorIDMissingFromUserDefaults) {
    // Check to see if a UUID is stored in the KeyChain
    NSDictionary *query = @{
                            (__bridge id)kSecClass:             (__bridge id)kSecClassGenericPassword,
                            (__bridge id)kSecAttrAccount:       kKeyChainVendorID,
                            (__bridge id)kSecAttrService:       kKeyChainVendorID,
                            (__bridge id)kSecAttrAccessGroup:   kKeyChainVendorIDAccessGroup,
                            (__bridge id)kSecMatchLimit:        (__bridge id)kSecMatchLimitOne,
                            (__bridge id)kSecReturnAttributes:  (__bridge id)kCFBooleanTrue
                           };
    CFTypeRef attributesRef = NULL;
    OSStatus result = SecItemCopyMatching((__bridge CFDictionaryRef)query, &attributesRef);
    if (result == noErr) {
        // There is a UUID, so try to retrieve it
        NSDictionary *attributes = (__bridge_transfer NSDictionary *)attributesRef;
        NSMutableDictionary *valueQuery = [NSMutableDictionary dictionaryWithDictionary:attributes];

        [valueQuery setObject:(__bridge id)kSecClassGenericPassword  forKey:(__bridge id)kSecClass];
        [valueQuery setObject:(__bridge id)kCFBooleanTrue            forKey:(__bridge id)kSecReturnData];

        CFTypeRef passwordDataRef = NULL;
        OSStatus result = SecItemCopyMatching((__bridge CFDictionaryRef)valueQuery, &passwordDataRef);
        if (result == noErr) {
            NSData *passwordData = (__bridge_transfer NSData *)passwordDataRef;
            uuidString = [[NSString alloc] initWithBytes:[passwordData bytes]
                                                  length:[passwordData length]
                                                encoding:NSUTF8StringEncoding];
        }
    }
}

// Failed to read the UUID from the KeyChain, so create a new UUID and store it
if (uuidString == nil || uuidString.length == 0) {
    // Generate the new UIID
    CFUUIDRef uuidRef = CFUUIDCreate(kCFAllocatorDefault);
    uuidString = (__bridge_transfer NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidRef);
    CFRelease(uuidRef);

    // Now store it in the KeyChain
    NSDictionary *query = @{    (__bridge id)kSecClass:             (__bridge id)kSecClassGenericPassword,
                                (__bridge id)kSecAttrAccount:       kKeyChainVendorID,
                                (__bridge id)kSecAttrService:       kKeyChainVendorID,
                                (__bridge id)kSecAttrAccessGroup:   kKeyChainVendorIDAccessGroup,
                                (__bridge id)kSecAttrLabel:         @"",
                                (__bridge id)kSecAttrDescription:   @"",
                                (__bridge id)kSecAttrAccessible:    (__bridge id)kSecAttrAccessibleAfterFirstUnlock,
                                (__bridge id)kSecValueData:         [uuidString dataUsingEncoding:NSUTF8StringEncoding]
                            };

    OSStatus result = SecItemAdd((__bridge CFDictionaryRef)query, NULL);
    if (result != noErr) {
        NSLog(@"ERROR: Couldn't add to the Keychain. Result = %ld; Query = %@", result, query);
        return nil;
    }
}

// Save UUID to NSUserDefaults so that we can avoid the KeyChain next time
if (vendorIDMissingFromUserDefaults) {
    [[NSUserDefaults standardUserDefaults] setObject:uuidString forKey:kKeyChainVendorIDGroup];
}

return [[NSUUID alloc] initWithUUIDString:uuidString];

}

但我想知道这里的 kKeyChainVendorID 和 kKeyChainVendorIDAccessGroup 在这里它使用的就像

 static NSString * const kKeyChainVendorID = @"co.cwbrn.PersistentIdentifier";
static NSString * const kKeyChainVendorIDAccessGroup = @"<AppIdentifier>.<keychain-access-group-identifier>";

对于我的应用程序，我如何获得两个值，如 kKeyChainVendorID 和 kKeyChainVendorIDAccessGroup？请给我解决方案，在我的 Xcode 5.0 版本中发生错误

 NSString *uuidString = [[NSUserDefaults standardUserDefaults] stringForKey:kKeyChainVendorIDGroup];

错误是：- 将 kKeyChainVendorIDGroup 替换为 kKeyChainVendorID。我可以更换它然后它是否有效请给我两个问题的解决方案

提前致谢。感谢 nelico post 在堆栈溢出中的回答。

Answer 1

这里是我Post我自己的答案。我从这个 Link

得到答案

http://objectivecwithsuraj.blogspot.in/2014/01/unique-identifier-uuid-ios.html

我使用 FDKeyChain 并编写以下代码将 UUID 保存在 KeyChain

只需定义两个字符串，如

static NSString * const KeychainItem_Service = @"FDKeychain";
static NSString * const KeychainItem_UUID = @"Local";

对于获取 UUID，我写成

uniqueIdentifier=[self generateUUID];
-(NSString *)generateUUID {
NSString *CFUUID = nil;

if (![FDKeychain itemForKey: KeychainItem_UUID
                 forService: KeychainItem_Service
                      error: nil]) {
    CFUUIDRef uuid = CFUUIDCreate(kCFAllocatorDefault);

    CFUUID = (NSString *)CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, uuid));

    [FDKeychain saveItem: CFUUID
                  forKey: KeychainItem_UUID
              forService: KeychainItem_Service
                   error: nil];

} else {
    CFUUID = [FDKeychain itemForKey: KeychainItem_UUID
                         forService: KeychainItem_Service
                              error: nil];
}

return CFUUID;

}

希望对某人有所帮助。如果我的回答有问题，请给我解决方案。谢谢回复。

如何在钥匙串 iOS 中保存 UUID？

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