Question

let rootInfo = realm.objects(StoreRealM.self).filter(msg)
    var root = [StoreRealM]()            
    for i in 0 ..< rootInfo.count {
        if let result = rootInfo[i] as? StoreRealM {
            root.append(result)
        }
    }

在这一行

if let result = rootInfo[i] as? StoreRealM我明白了。我也得到了

来自＆＃39; StoreRealM＆＃39;的有条件演员表到＆＃39; StoreRealM＆＃39;总是成功

Answer 1

由于root只能包含/* ---------- Get row query parameter from AJAX GET ---------- */ $n = $_GET['row']; /* ============================================= = Section : Table row logic = ============================================= */ // Write here your row logic and pass it to tr. // E.g: define('SPARES_ID', 'xxx'); define('SPARES_BRIEFDESC', 'xxx'); define('UNIT_ID', 'xxx'); define('UNIT_DESC', 'xxx'); $query2 = ''; $m = ''; /* ===== End of Section ====== */ /* ---------- Generate Table Row and return it---------- */ echo $tr = '<tr> ' . '<td class="no">' . $n . '</td>' . '<td>' . creaLista('mrditemid[]', 3, SPARES_ID, SPARES_BRIEFDESC, $query2, $m) . '</td>' . '<td>' . creaLista('mrdunits[]', 4, UNIT_ID, UNIT_DESC, $query2, $m) . '</td>' . '<td><input type="text" class="form-control mrdquantity" name="mrdquantity[]"></td>' . '<td><input type="text" class="form-control mrdremarks" name="mrdremarks[]"></td>' . '<td><button class="btnDelete btn btn-danger">-</td>' . '</tr>'; exit();个对象（由编译器保证），因此您无需将索引访问权限转换为此类型;更重要的是，它不能包含StoreRealM个对象。

所以编写for循环就足够了：

Optional<StoreRealM>

用于检查选项的非可选表达式

1 个答案: