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KeyChainItemWrapper 有一个奇怪的问题。

我曾经像这样创建其中两个：

KeychainItemWrapper *kcWrapper = [[KeychainItemWrapper alloc] initWithIdentifier:@"first" accessGroup:nil];

KeychainItemWrapper *kcWrapper1 = [[KeychainItemWrapper alloc] initWithIdentifier:@"second" accessGroup:nil];

然后我会设置一个像这样的对象：

[kcWrapper setObject:@"something" forKey:(__bridge id)kSecValueData];
[kcWrapper1 setObject:@"something1" forKey:(__bridge id)kSecValueData];

这工作得很好，直到……什么都没有改变？

现在我得到这个错误：

*** Assertion failure in -[KeychainItemWrapper writeToKeychain],
/Users/wingair/Documents/iOSProjects/tulipstempelkort-

ios/stempelkort/../KeychainItemWrapper.m:305

第 305 行是：

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

被困在这里很长一段时间，任何帮助表示赞赏。

writeToKeyChain 函数：

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

[tempCheck removeObjectForKey:(__bridge id)kSecAttrAccessGroup];

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

    result = SecItemUpdate((__bridge CFDictionaryRef)updateItem, (__bridge CFDictionaryRef)tempCheck);
    NSAssert( result == noErr, @"Couldn't update the Keychain Item." );
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