How to call a method from InheritedWidget only once?

问题

I'm developing with reactive components streams/observables with Rx_command, Rx_dart

Problem:

• In my Flutter app I have inherited widget that can be called anywhere with:

  FooProvider.of(context).foo.method1...

• I need to make a first call to the method when the UI loads at first time

• I can't use init.state because it's impossible

• I use didchangedependencies it works but..

  ... every time the ui reloads, the didchangedependencies is called and the method is executed once again.

I don't want it to be executed and I can't use init.state

How can execute the method only once?

回答1:

Instead of context.inheritFromWidgetOfExactType, use context.ancestorInheritedElementForWidgetOfExactType

final myInherited = context.ancestorInheritedElementForWidgetOfExactType(MyInherited)?.widget;

This method is available inside initState

来源：https://stackoverflow.com/questions/53022964/how-to-call-a-method-from-inheritedwidget-only-once