不推荐使用InheritedFromWidgetOfExactType，而是使用dependOnOnInheritedWidgetOfExactType [英] inheritFromWidgetOfExactType is deprecated use dependOnInheritedWidgetOfExactType instead

问题描述

自Flutter 1.12发布以来，我的以下代码:

Since the release of Flutter 1.12 my following code:

static MyInheritedWidget of(BuildContext context) {
  return context.inheritFromWidgetOfExactType(MyInheritedWidget) as MyInheritedWidget;
}

警告以下内容:

'inheritFromWidgetOfExactType'已弃用，不应使用.请改用DependOnInheritedWidgetOfExactType.v1.12.1之后不推荐使用此功能.尝试用替代品替换不赞成使用的成员.

'inheritFromWidgetOfExactType' is deprecated and shouldn't be used. Use dependOnInheritedWidgetOfExactType instead. This feature was deprecated after v1.12.1.. Try replacing the use of the deprecated member with the replacement.

但是当我尝试更换它时，它不起作用:

But when I try to replace it, it does not work:

static MyInheritedWidget of(BuildContext context) {
  return context.dependOnInheritedWidgetOfExactType(MyInheritedWidget) as MyInheritedWidget;
}

有人知道该怎么做吗?谢谢！

Does someone know how to do it? Thanks!

推荐答案

API稍有变化.

现在，该方法不再使用 Type 作为参数，而是通用的.

Now instead of taking a Type as argument, the method is generic.

之前:

final widget = context.inheritFromWidgetOfExactType(MyInheritedWidget) as MyInheritedWidget;

之后:

final widget = context.dependOnInheritedWidgetOfExactType<MyInheritedWidget>();

请注意，不再需要强制转换

Note that the cast is no longer necessary

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