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我试图将我的TextFormField逻辑移动到颤振钩子上,所以我有密码字段,我想在其中实现obscure文本。所以点击按钮它应该隐藏/取消隐藏文本。现在我使用setState()钩子来做到这一点,但它重建了整个 UI 并将焦点移动到第一个字段,因为我已经为第一个字段设置了 autoFocus,所以我如何确保它只重建特定的 TextFormField。

我的自定义钩子文件,

import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';


enum Index { email, password }

TextFormField useTextFormField(Index index) {
  return use(_CustomHook(index: index));
}

class _CustomHook extends Hook<TextFormField> {
  final Index index;

  _CustomHook({@required this.index});

  @override
  _CustomHookState createState() => _CustomHookState();
}

class _CustomHookState extends HookState<TextFormField, _CustomHook> {
  Index index;
  bool obscure = false;
  @override
  TextFormField build(BuildContext context) {
    return TextFormField(
      decoration: InputDecoration(
        hintText: 'some help',
        suffixIcon: IconButton(
          onPressed: () {
            setState(() {
              obscure = !obscure; //<--- here
            });
          },
          icon: Icon(obscure ? Icons.visibility_off : Icons.visibility),
        ),
      ),
      validator: (text) {
        if (text.isEmpty) return 'enter something';

        return null;
      },
      obscureText: index == Index.email ? false : obscure,
    );
  }
}

如果有人可以帮忙?

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