Ios SecItem方法失败，返回-34018

我使用下面的代码在iOS上安全地存储字符串。有时

SecItemCopyMatching（）

，然后也

SecItemAdd（）

失败并返回错误代码

-34018

。我找不到这个代码；这是什么意思

NSMutableDictionary* query = [NSMutableDictionary dictionary];

[query setObject:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass];
[query setObject:account forKey:(__bridge id)kSecAttrAccount];
[query setObject:(__bridge id)kSecAttrAccessibleAlways forKey:(__bridge id)kSecAttrAccessible];

OSStatus error = SecItemCopyMatching((__bridge CFDictionaryRef)query, NULL);
if (error == errSecSuccess)
{
    // Do update.
    NSDictionary* attributesToUpdate;
    attributesToUpdate = [NSDictionary dictionaryWithObject:[inputString dataUsingEncoding:NSUTF8StringEncoding]
                                                     forKey:(__bridge id)kSecValueData];

    error = SecItemUpdate((__bridge CFDictionaryRef)query, (__bridge CFDictionaryRef)attributesToUpdate);
    if (error != errSecSuccess)
    {
        NBLog(@"SecItemUpdate failed: %d", (int)error);
        result = NO;
    }
}
else if (error == errSecItemNotFound)
{
    // Do add.
    [query setObject:[inputString dataUsingEncoding:NSUTF8StringEncoding] forKey:(__bridge id)kSecValueData];

    error = SecItemAdd((__bridge CFDictionaryRef)query, NULL);
    if (error != errSecSuccess)
    {
        NBLog(@"SecItemAdd failed: %d", (int)error);
        result = NO;
    }
}

---

-34018

是根据

当所需权限不存在时出现内部错误。

对于iOS 10+版，您需要一个

.authorities

文件来访问钥匙链。大概是这样的：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.keystore.access-keychain-keys</key>
    <true/>
    <key>com.apple.keystore.device</key>
    <true/>
</dict>
</plist>

com.apple.keystore.access-keychain-keys
com.apple.keystore.device

您是否看到设备或模拟器出现故障？@zaph在设备上。你知道这个特殊的（可能是苹果内部的）错误代码是什么意思吗？