ios - 应用程序在钥匙串(keychain)中保存数据时崩溃

Question

我正在使用 KeychainItemWrapper 用于在钥匙串(keychain)中保存数据的类，但我的应用程序因崩溃日志而崩溃 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因:“无法添加钥匙串(keychain)项。”

这是一种在钥匙串(keychain)中写入数据的方法

- (void)writeToKeychain
{
    NSDictionary *attributes = NULL;
    NSMutableDictionary *updateItem = NULL;
    OSStatus result;

    if (SecItemCopyMatching((CFDictionaryRef)genericPasswordQuery, (CFTypeRef *)&attributes) == noErr)
    {
        // First we need the attributes from the Keychain.
        updateItem = [NSMutableDictionary dictionaryWithDictionary:attributes];
        // Second we need to add the appropriate search key/values.
        [updateItem setObject:[genericPasswordQuery objectForKey:(id)kSecClass] forKey:(id)kSecClass];

        // Lastly, we need to set up the updated attribute list being careful to remove the class.
        NSMutableDictionary *tempCheck = [self dictionaryToSecItemFormat:keychainItemData];
       [tempCheck removeObjectForKey:(id)kSecClass];

#if TARGET_IPHONE_SIMULATOR
        // Remove the access group if running on the iPhone simulator.
        // 
        // Apps that are built for the simulator aren't signed, so there's no keychain access group
        // for the simulator to check. This means that all apps can see all keychain items when run
        // on the simulator.
        //
        // If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the
        // simulator will return -25243 (errSecNoAccessForItem).
        //
        // The access group attribute will be included in items returned by SecItemCopyMatching,
        // which is why we need to remove it before updating the item.
        [tempCheck removeObjectForKey:(id)kSecAttrAccessGroup];
#endif

        // An implicit assumption is that you can only update a single item at a time.

        result = SecItemUpdate((CFDictionaryRef)updateItem, (CFDictionaryRef)tempCheck);
        NSAssert( result == noErr, @"Couldn't update the Keychain Item." );
    }
    else
    {
        // No previous item found; add the new one.
        result = SecItemAdd((CFDictionaryRef)[self dictionaryToSecItemFormat:keychainItemData], NULL);

        NSAssert( result == noErr, @"Couldn't add the Keychain Item." );
     }
}

我的应用程序在 崩溃了

result = SecItemAdd((CFDictionaryRef)[self dictionaryToSecItemFormat:keychainItemData], NULL);

带有断言错误消息 -[KeychainItemWrapper writeToKeychain] 中的断言失败

这是在 keychainItemData 中分配的值

Printing description of self->keychainItemData:
{
    acct = "";
    desc = "";
    gena = "com.xyz.abc";
    labl = "";
    "v_Data" = "ABCDSS-ABCDSS-ABCDSS-TEST-DATA";
}

我知道类似的问题已经在这里问了很多次，但对我没有任何帮助。

谁能帮我吗 ？有没有其他方法可以将数据保存在钥匙串(keychain)中。

提前致谢。

Answer 1

在您的方法中使用 self.keychainItemData 而不是 keychainItemData ？

- (void)writeToKeychain
{
    NSDictionary *attributes = NULL;
    NSMutableDictionary *updateItem = NULL;
    OSStatus result;

    if (SecItemCopyMatching((CFDictionaryRef)genericPasswordQuery, (CFTypeRef *)&attributes) == noErr)
    {
        // First we need the attributes from the Keychain.
        updateItem = [NSMutableDictionary dictionaryWithDictionary:attributes];
        // Second we need to add the appropriate search key/values.
        [updateItem setObject:[genericPasswordQuery objectForKey:(id)kSecClass] forKey:(id)kSecClass];

        // Lastly, we need to set up the updated attribute list being careful to remove the class.
        NSMutableDictionary *tempCheck = [self dictionaryToSecItemFormat:self.keychainItemData];
       [tempCheck removeObjectForKey:(id)kSecClass];

#if TARGET_IPHONE_SIMULATOR
        // Remove the access group if running on the iPhone simulator.
        // 
        // Apps that are built for the simulator aren't signed, so there's no keychain access group
        // for the simulator to check. This means that all apps can see all keychain items when run
        // on the simulator.
        //
        // If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the
        // simulator will return -25243 (errSecNoAccessForItem).
        //
        // The access group attribute will be included in items returned by SecItemCopyMatching,
        // which is why we need to remove it before updating the item.
        [tempCheck removeObjectForKey:(id)kSecAttrAccessGroup];
#endif

        // An implicit assumption is that you can only update a single item at a time.

        result = SecItemUpdate((CFDictionaryRef)updateItem, (CFDictionaryRef)tempCheck);
        NSAssert( result == noErr, @"Couldn't update the Keychain Item." );
    }
    else
    {
        // No previous item found; add the new one.
        result = SecItemAdd((CFDictionaryRef)[self dictionaryToSecItemFormat:self.keychainItemData], NULL);

        NSAssert( result == noErr, @"Couldn't add the Keychain Item." );
     }
}