{
ns dictionary * query =[ns dictionary dictionaryWithObjectsAndKeys:
？kSecClassGenericPassword，kSecClass，
？@"bundleSeedID "，kSecAttrAccount，
？@ " "，kSecAttrService，
？(id)kcfbooleantrule，kSecReturnAttributes
？nil]；
CFDictionaryRef結果= nil
OS status status = SecItemCopyMatching((CFDictionaryRef)查詢，(cf typeref *)& amp；結果)；
if (status == errSecItemNotFound)
status = SecItemAdd((CFDictionaryRef)查詢，(cf typeref *)& amp；結果)；
如果(狀態！= errSecSuccess)
返回nil
ns string * access group =[(ns dictionary *)result objectForKey:kSecAttrAccessGroup]；
ns array * components =[access group components separated bystring:@"。];
ns string * bundleSeedID =[[components object enumerator]next object]；
CFRelease(結果)；
返回bundleSeedID
}