Flutter编译运行时报错:
The following assertion was thrown building Text("双击事件DoubleTap", inherit: true, color: Color(0xffffffff), size: 24.0):
No Directionality widget found.
RichText widgets require a Directionality widget ancestor.
源代码
import 'package:flutter/material.dart';void main() => runApp(const GestureDetectorPage());class GestureDetectorPage extends StatefulWidget { const GestureDetectorPage({Key? key}) : super(key: key); @override State createState() { return GestureDetectorPageState(); }}class GestureDetectorPageState extends State { String operation = "No Gesture"; @override Widget build(BuildContext context) { return Row( mainAxisAlignment: MainAxisAlignment.center, // 居中对齐 children: [ GestureDetector( child: Container( margin: const EdgeInsets.only(top: 20), alignment: Alignment.center, color: Colors.blue, width: 150, height: 80, child: Text( operation, // textDirection: TextDirection.ltr, style: const TextStyle(color: Colors.white,fontSize: 24), ), ), onTap: () => updateGesture("单击事件Tap"), onDoubleTap: () => updateGesture("双击事件DoubleTap"), onLongPress: () => updateGesture("长按事件LongPress"), ) ], ); } void updateGesture(String text) { setState(() { operation = text; }); }}打开 textDirection: TextDirection.ltr,这样代码即可;