What is the tool used to design UI view controllers and storyboards for iOS NIB UI?
[UPDATE] I am looking for a user interface development tool in terms of layout sketches more than the StoryBoard Xcode design. The goal is to construct UIViewControllers threads, as shown by Apple in the iOS Developer Library.
I checked some UML class diagram diagrams such as Visual Paradigm, Magic Draw, etc., but they also do not have a visual layout for the user interface.
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