Question

我正在颤抖，我只是一个初学者。我有多个列表，希望最终将其放入抽屉的菜单中，但是我在视觉上有问题。

我附了一张图片。当您单击标题以下拉列表时，标题本身就会消失。看来这不是我在互联网上看到的其他教程的默认行为。

有人可以帮我吗？

我的代码如下：

package main

import (
    "fmt"
    "math/rand"
)

const (
    ROCK int = iota
    PAPER
    SCISSORS
)

type Choice struct {
    Who   int //0 you 1 your opponent
    Guess int
}

//Win returns true if you win.
func Win(you, he int) bool {
    ...
}

func Opponent(guess chan Choice, please chan struct{}) {
    for i := 0; i < 3; i++ {
        <-please
        choice := rand.Intn(3)
        who := 1
        guess <- Choice{who, choice}
        please <- struct{}{}
    }
}

func GetChoice(you, he int) int {
    ...
}

var Cheat func(guess chan Choice) chan Choice = func(guess chan Choice) chan Choice {
    new_guess := make(chan Choice)
    // go func() {
    for i := 0; i < 3; i++ {
        g1 := <-guess
        g2 := <-guess
        if g1.Who == 0 {
            choice := GetChoice(g1.Guess, g2.Guess)
            new_guess <- g2
            new_guess <- Choice{g1.Who, choice}
        } else {
            choice := GetChoice(g2.Guess, g1.Guess)
            new_guess <- g1
            new_guess <- Choice{g2.Who, choice}
        }
    }
    // }()
    fmt.Println("...")
    return new_guess
}

func Me(guess chan Choice, please chan struct{}) {

    for i := 0; i < 3; i++ {
        <-please
        choice := rand.Intn(3)
        who := 0
        guess <- Choice{who, choice}
        please <- struct{}{}
    }
}

func Game() []bool {
    guess := make(chan Choice)
    //please sync 2 goroutines.
    please := make(chan struct{})
    go func() { please <- struct{}{} }()
    go Opponent(guess, please)
    go Me(guess, please)
    guess = Cheat(guess)
    var wins []bool

    for i := 0; i < 3; i++ {
        g1 := <-guess
        g2 := <-guess
        win := false
        if g1.Who == 0 {
            win = Win(g1.Guess, g2.Guess)
        } else {
            win = Win(g2.Guess, g1.Guess)
        }
        wins = append(wins, win)
    }

    return wins
}

func main() {
    win := Game()
    fmt.Println(win)
}

flutter app missing title when clicked

这是我的main.dart文件

import 'package:flutter/material.dart';

class HomePage extends StatelessWidget {
 @override
Widget build(BuildContext context) {
return Scaffold(
  appBar: AppBar(
    iconTheme: IconThemeData(color: Colors.white),
    title: Text(
      'Home',
      style: TextStyle(color: Colors.white),
    ),
  ),
  body: new ListView.builder(
    itemBuilder: (BuildContext context, int index) {
      return new StuffInTiles(listofTiles[index]);
    },
    itemCount: listofTiles.length,
  ),
);
}
}

class StuffInTiles extends StatelessWidget {
final MyTile myTile;

StuffInTiles(this.myTile);

@override
Widget build(BuildContext context) {
   return _buildTiles(myTile);
}

Widget _buildTiles(MyTile t) {
if (t.children.isEmpty) return new ListTile(title: new Text(t.title));
return new ExpansionTile(
  key: new PageStorageKey<MyTile>(t),
  title: new Text(t.title),
  children: t.children.map(_buildTiles).toList(),
);
}
}

class MyTile {
String title;
List<MyTile> children;

MyTile(this.title, [this.children = const <MyTile>[]]);
}

List<MyTile> listofTiles = <MyTile>[
new MyTile('Animals', <MyTile>[
new MyTile('Dogs', <MyTile>[new MyTile('dog one '), new MyTile('dog two')])
]) 
];

我不明白的一件事是，当我将Homepage构建小部件包装到Material App中时，它可以工作，但我不认为您应该这样做

请注意，main.dart文件将加载登录页面，然后登录页面将加载首页。

如果您在Material App中将HomePage添加到主页，将无法正常工作！

Answer 1

我找到了自己的答案。当您开始时，最好不要对您不了解的事情胡闹。我有

accentColor: Colors.white,

添加到我的主题数据中，使其在其后面的白色中消失。抱歉，愚蠢的错误

单击时颤振扩展图块消失

1 个答案: