How can an application respond to they keyboard being dismissed by the user

Which one is true?

If you have a CGPathRef and need to draw this path to a core animation layer, which object would you use.

When you download a file and the application go to background. You can ...

When you play a video with AV Foundation and aAVPlayer. If you want to mute the video

Which Interface Builder object will help you to create an animation with a given number of images?

Which core extensions of Intents framework represents the entry point for an Intents extension?

Which classes handles the communication between a user and an app involving the intent object?

Sliced apps are supported by devices running:

Which App Extension points handle tasks related to supporting Siri integration with an iOS App?

Which protocol define the methods to handle the displaying and editing of content in the Today Widget?