How to add custom spacing to UIStackView items
Each UIStackView has an overall spacing property that affects spacing between all of its arranged subviews, but in addition you can add custom spacing after specific views – for example, “put 20 points of space under this button.”
To make that happen, use the setCustomSpacing() method of your stack view, providing it the number of points of spacing you want and the view that should precede the spacing.
For example, this code creates a stack view and a button, adds the button to the stack view, then requests 20 points of spacing after it:
let stackView = UIStackView()
let btn = UIButton()
stackView.addArrangedSubview(btn)
stackView.setCustomSpacing(20, after: btn)Available from iOS 11.0
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