通常,当从列表渲染时,我会看到 Flutter 抛出以下内容,从下面的示例中,请参阅 PositionedTilesState:
ChromeProxyService: Failed to evaluate expression 'tiles'.
ChromeProxyService: Failed to evaluate expression '[ '.
ChromeProxyService: Failed to evaluate expression 'StatelessColorfulTile'.
ChromeProxyService: Failed to evaluate expression 'PositionedTilesState'.
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您看到这个并找到解决方案了吗?
例子:
import 'package:flutter/material.dart';
import 'package:example/dart/concepts/color/unique_color_generator.dart';
// PositionedTiles
class PositionedTiles extends StatefulWidget {
final String? title;
const PositionedTiles({Key? key, required this.title}) : super(key: key);
@override
State<StatefulWidget> createState() => PositionedTilesState();
}
// PositionedTilesState
class PositionedTilesState extends State<PositionedTiles> {
List<Widget> tiles = [
StatelessColorfulTile(),
StatelessColorfulTile(),
];
@override
Widget build(BuildContext context) {
return Scaffold(
body: Row(children: tiles),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.sentiment_very_satisfied), onPressed: swapTiles),
);
}
swapTiles() {
setState(() {
tiles.insert(1, tiles.removeAt(0));
});
}
}
// StatelessColorfulTile
class StatelessColorfulTile extends StatelessWidget {
final Color myColor = UniqueColorGenerator.getColor();
StatelessColorfulTile({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Container(
color: myColor, child: const Padding(padding: EdgeInsets.all(70.0)));
}
}
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