In the post “iOS: Defining a fixed or constant width or height constraint programmatically” , we programmatically added constraints that will ensure a fixed with and height for a view. This time, we will programmatically add constraints that will fit a view to its superview. This is especially useful if we have a container view that must occupy up the whole screen.

I have a view (let’s call this containerView) which is programmatically added as a subview of a UIViewController’s main view (this is self.view when called within the UIViewController).
Since I can’t define the constraints in Storyboard, I need to create the Auto Layout constraints programmatically.
The following code is added to the implementation file of the UIViewController:

We added the constraints in updateViewConstraints as specified in

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