Swift version: 5.1
One of the most compelling reasons to upgrade to iOS 9.0 is the new
UIStackView class it introduced, which offers a simplified way of doing layouts in iOS. To give you more control over how it arranges their subviews, stack views offer five different distribution types for you to try, and here's what they do:
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Available from iOS 9.0 – see Hacking with Swift tutorial 31
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.