问SecItemCopyMatching返回零

EN

- (NSString *)bundleSeedID:(NSError **)error __attribute__((annotate("oclint:suppress"))) {
NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
                       (__bridge NSString *)kSecClassGenericPassword, (__bridge NSString *)kSecClass,
                       BUNDLE_SEED_ID, kSecAttrAccount,
                       EMPTY_STRING, kSecAttrService,
                       (__bridge NSString *)kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly, (__bridge NSString *)kSecAttrAccessible,
                       (id)kCFBooleanTrue, kSecReturnAttributes,
                       nil];
CFDictionaryRef result = nil;
OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, (CFTypeRef *)&result);
if (status == errSecItemNotFound) {
    status = SecItemAdd((__bridge CFDictionaryRef)query, (CFTypeRef *)&result);
}

if (status != errSecSuccess) {
    if (error) *error = [ErrorUtils bundleSeedErrorWithCode:(int)status];
    return nil;
}
NSString *accessGroup = [(__bridge NSDictionary *)result objectForKey:(__bridge NSString *)kSecAttrAccessGroup];
NSArray *components = [accessGroup componentsSeparatedByString:@"."];
NSString *bundleSeedID = [[components objectEnumerator] nextObject];
CFRelease(result);
return bundleSeedID;
}