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颤振-启动时检查语言

flutter

El Hombre Sin Nombre · 技术社区 · 6 年前

我试图检查设备的语言以显示/隐藏某些元素我试着类似于

 @override
      initState() {
        super.initState();    
     if (Localizations.localeOf(context).countryCode == 'en') {
              en = true;
            } else {
              en = false;
            }
    }

但是回报

 The following assertion was thrown building Builder:
I/flutter ( 8804): inheritFromWidgetOfExactType(_LocalizationsScope) or inheritFromElement() was called before
I/flutter ( 8804): _FormViewPage.initState() completed.
I/flutter ( 8804): When an inherited widget changes, for example if the value of Theme.of() changes, its dependent
I/flutter ( 8804): widgets are rebuilt. If the dependent widget's reference to the inherited widget is in a constructor
I/flutter ( 8804): or an initState() method, then the rebuilt dependent widget will not reflect the changes in the
I/flutter ( 8804): inherited widget.
I/flutter ( 8804): Typically references to inherited widgets should occur in widget build() methods. Alternatively,
I/flutter ( 8804): initialization based on inherited widgets can be placed in the didChangeDependencies method, which
I/flutter ( 8804): is called after initState and whenever the dependencies change thereafter.

如果我用 didChangeDependencies 不返回错误,但不运行if..else语句,我需要在开始时运行。

所以:有人知道我该如何正确检查语言吗?

1 回复 | 直到 6 年前

anmol.majhail 6 年前

你得用它 WidgetsBinding 一旦小部件树准备好。

 super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (Localizations.localeOf(context).countryCode == 'en') {
        en = true;
      } else {
        en = false;
      }
    });

了解更多信息- addPostFrameCallback