从List< Widget>中删除索引明智的CustomWidget.在Flutter [英] Remove Index wise CustomWidget from List<Widget> in Flutter

问题描述

我最初在Column中没有Widget的空列表.现在，在其他"小部件上，单击我要在_contactItems

I have initially empty list of Widget in Column. Now on Other widget click I am adding new Custom Widget in _contactItems

   Column(
      children: _contactItems,
    )

 List<Widget> _contactItems = new List<CustomWidget>();



 _contactItems.add(newCustomWidget(value));

现在假设我有6条记录(列"中有6个自定义小部件").我正在尝试删除索引明智的记录(例如.我要删除第3条记录，然后删除第1条记录.列小部件(动态小部件)应更新为_contactItems，在setState()中更新)

Now Suppose I have 6 Records (6 Custom Widgets in Column). I am trying to remove index wise records (Example. I am removing 3rd record then 1st record. Column Widgets (dynamic widgets) should be updated as _contactItems updating in setState())

现在，在 CustomWidget 上单击我正在从列中删除特定的 CustomWidget ".

Now on CustomWidget click I am removing that particular CustomWidget from Column.

setState(() {
          _contactItems.removeAt(index);
        });

也尝试过

_contactItems.removeWhere((item) {
            return item.key == _contactItems[index].key;
          });

推荐答案

尝试一下(假设您的Column小部件键具有这种格式):

Try this (assuming that your Column widget keys have this format):

setState(() {
  this._contactItems.removeWhere((contact) => contact.key == Key("index_$index"));
});

如果这不能解决您的问题，也许我们需要更多信息.

If this doesn't solve your issue, maybe we'll need more info.

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