For what purpose and how is the property contentHuggingPriority used in a view?

The contentHuggingPriority property of UIView in iOS is used to control how strongly a view wants to maintain its minimal size based on its content when automatically calculating sizes with Auto Layout.

The higher the contentHuggingPriority, the more the view "resists" increasing its size beyond what is necessary to display its content. This helps prevent unnecessary stretching of interface elements.

For example, if you have a horizontal stack of two labels and you want the first label to occupy exactly the space needed for its text, while the second label stretches, you should set a higher contentHuggingPriority for the first label horizontally.

Example of setting priorities:

label1.setContentHuggingPriority(.defaultHigh, for: .horizontal)
label2.setContentHuggingPriority(.defaultLow, for: .horizontal)

Thus, Auto Layout will try not to stretch label1 beyond its content, while label2 can expand.