Web应用程序通常反映当前显示的tab's title个内容.
将title parameter提供给MaterialApp或WidgetsApp意味着我不能将其更改为without rebuilding the entire tree，即在返回MaterialApp的顶层调用setState.
MaterialApp(
title: 'Web app title',
...,
)
我希望能够在any time的应用程序中将app title从anywhere更改为app title.我该怎么做？
app title可以使用SystemChrome.setApplicationSwitcherDescription:
@override
Widget build(BuildContext context) {
SystemChrome.setApplicationSwitcherDescription(ApplicationSwitcherDescription(
标签: 'Dynamic web app title',
原色: Theme.of(context).原色.value,
));
return Container(...);
}
SystemChrome和import 'package:flutter/services.dart';一起使用，你想在103 method中拨打setApplicationSwitcherDescription.
Title也是这样做的(参见source code)，这是WidgetsApp、MaterialApp等使用的小部件.
因此，您也可以使用Title小部件，而不是自己访问SystemChrome:
@override
Widget build(Context context) {
return Title(
标签: 'Dynamic app title',
原色: Theme.of(context).原色,
child: ..,
);
}
标签标签参数非常简单:它精确地映射到MaterialApp中的title和String.
原色The 原色 will determine the color the system might use in the application switcher, e.g. the title bar color in recents on Android.
This is an int instead of a Color, which is why you need to call Color.value to convert your primary color to an integer.
TitlesYou might ask yourself if calling setApplicationSwitcherDescription or inserting a Title widget when the title property on MaterialApp is set can cause any problems.
The answer is: no because the widget that is the deepest down in the tree will set the title. Essentially, even if the whole app rebuilds, your setApplicationSwitcherDescription will be called after that of MaterialApp assuming you are calling it in a child and therefore you will override the MaterialApp title.