在 Flutter 中，处理 TextField 的失去焦点事件（即失去焦点时触发的操作）通常有两种常用方式：使用 FocusNode 或 onEditingComplete 回调。以下是具体实现：

import 'package:flutter/material.dart';class MyTextField extends StatefulWidget {@override_MyTextFieldState createState() => _MyTextFieldState();
}class _MyTextFieldState extends State<MyTextField> {final FocusNode _focusNode = FocusNode();final TextEditingController _controller = TextEditingController();@overridevoid initState() {super.initState();_focusNode.addListener(_onFocusChange);}void _onFocusChange() {if (!_focusNode.hasFocus) {print('输入框失去焦点');// 处理逻辑}}@overrideWidget build(BuildContext context) {return TextField(controller: _controller,focusNode: _focusNode,decoration: InputDecoration(labelText: '请输入内容',),);}
}

失去焦点事件通常用于验证用户输入、自动保存内容或触发其他相关操作，比如在用户完成输入后立即验证格式是否正确。4K壁纸