What is an iOS phone?

iOS device (IPhone OS device) Products that use Apple’s iPhone operating system, including the iPhone, iPod touch and iPad . It specifically excludes the Mac. Also called “iDevice” or “iThing.” See iDevice and iOS versions.

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What is a ViewController?

A view controller manages a single root view, which may itself contain any number of subviews . User interactions with that view hierarchy are handled by your view controller, which coordinates with other objects of your app as needed. Every app has at least one view controller whose content fills the main window.

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