Flutter 点击拖拽收回键盘

/// 移除键盘核心代码
FocusScope.of(context).requestFocus(new FocusNode());

创建dart文件，并添加如下类。在需要点击或者拖拽的view外面嵌入如下类，触发相关方法的时候就可以收回键盘

//点击收回键盘
import 'package:flutter/material.dart';
class TouchHideKeyBoard extends StatelessWidget {
  final Widget child;
  TouchHideKeyBoard({this.child});
  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      behavior: HitTestBehavior.translucent,
      onTap: () {
        FocusScope.of(context).requestFocus(new FocusNode());
      },
      onHorizontalDragEnd: (_) {
        FocusScope.of(context).requestFocus(new FocusNode());
      },
      onVerticalDragEnd: (_) {
        FocusScope.of(context).requestFocus(new FocusNode());
      },
      child: child,
    );
  }
}