How could I use Image Playground API in my app without the API's UI ? I haven't find the API now, can anyone tell me ?

How can I change the background style of the control center widget，anyone can help me?

Make a control configurable to enable people to use multiple controls and to set them up to perform different actions. The apple's link is here: https://developer.apple.com/documentation/widgetkit/adding-refinements-and-configuration-to-controls. However I have't find how to select a different timer when editing the control. You can find a control widget which provided by apple called "Open App", in that control when you edit it, it provides a list of apps to choose. How could I configure my control widget with the same behavior, anyone can help me, thanks any way.