如何使valuelistenbuilder可以分配为图标？

发布于 2025-02-02 20:39:29 字数 594 浏览 4 评论 0原文

我试图将valuelistanablebuilder用作儿童小部件的参数，以前是一个图标，我用图标多次在父母的窗口小部件上打电话给这个孩子，但我需要一次将一个带有valuelistanablebuilder的孩子。

我试图删除数据类型图标图标;并使用最终图标，但它给了我警告更喜欢键入非初始化的变量和字段。 DART（pref_typing_uninitialized_variables）。

我如何使用valuelistanablebuilder 图标数据类型作为儿童窗口小部件的构造函数。

代码段示例：

// CameraScreen ( Parent )
...
CameraButton(icon: Icon(Icons.arrow_back_ios_new));
...

// CameraScreen ( Child )
...
class CameraButton extends StatelessWidget {
  Icon icon;
  CameraButton({ required this.icon });
...

原文

I was trying to use ValueListanableBuilder as a parameter to child widget, previously it was an Icon, and I calling this child multiple times on parent widget with Icon but I need to pass a child with ValueListanableBuilder once.

I have tried to remove data types Icon icon; and use final icon but it gives me warning Prefer typing uninitialized variables and fields. dart(prefer_typing_uninitialized_variables).

How can I use ValueListanableBuilder for Icon data type as a constructor for child widget.

Code Snippet Example:

// CameraScreen ( Parent )
...
CameraButton(icon: Icon(Icons.arrow_back_ios_new));
...

// CameraScreen ( Child )
...
class CameraButton extends StatelessWidget {
  Icon icon;
  CameraButton({ required this.icon });
...

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Oo萌小芽oO 2025-02-09 20:39:30

Camerascreen（父母）

class CameraScreen extends StatelessWidget {
  const CameraScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CameraButton(
      icon: ValueListenableBuilder<Icon>(
        valueListenable: ValueNotifier(Icon(Icons.arrow_back_ios_new)),
        builder: (_, __, ___) {
          // TODO: implement build
          throw UnimplementedError();
        },
      ),
    );
  }
}

Camerascreen（儿童）

class CameraButton extends StatelessWidget {
  const CameraButton({Key? key, required this.icon}) : super(key: key);
  final Widget icon;

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    throw UnimplementedError();
  }
}

CameraScreen ( Parent )

class CameraScreen extends StatelessWidget {
  const CameraScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CameraButton(
      icon: ValueListenableBuilder<Icon>(
        valueListenable: ValueNotifier(Icon(Icons.arrow_back_ios_new)),
        builder: (_, __, ___) {
          // TODO: implement build
          throw UnimplementedError();
        },
      ),
    );
  }
}

CameraScreen ( Child )

class CameraButton extends StatelessWidget {
  const CameraButton({Key? key, required this.icon}) : super(key: key);
  final Widget icon;

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    throw UnimplementedError();
  }
}

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