WidgetCenter cannot be found in objc project

My application is developed using objc, and I want to refresh timelines through the widget center in this project, but I can't find the widgetcenter. I have already imported the swift library through this reply. Can anyone tell me what steps are missing? Thank you very much!
WidgetCenter is not available to Objective C as it is a Swift only Framework. You would need to add Swift code / classes your app in order to call your WidgetCenter code.
Thank you for your reply. As you said, I have solved the problem.
WidgetCenter cannot be found in objc project
 
 
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