背景

使用Visibility来控制清理按钮的显示和隐藏，在设置Visibility的状态时，会导致TextField焦点丢失。使用AnimatedOpacity代替Visibility

在光标丢失后手动设置光标位置

void _setFocus({int? baseOffset}) {final int currentPosition =baseOffset ?? textController.selection.baseOffset;Future.delayed(Duration(milliseconds: 100), () {// Move focus to the end of the current textfocusNode.requestFocus();Future.delayed(Duration(milliseconds: 100), () {// Save the current cursor positiontextController.selection = TextSelection.fromPosition(TextPosition(offset: currentPosition),);});});}