How do I get the fitting size of either TZStackView or the UIStackView?

[fatuhoku]

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIStackView_Class_Reference/ has a section called Positioning and Sizing the Stack View — I don't understand this wording:

• Along the stack view’s axis, its fitting size is equal to the sum of the sizes of all the arranged views plus the space between views.
• Perpendicular to the stack view’s axis, its fitting size is equal to the size of the largest arranged view.
• If the stack view’s layoutMarginsRelativeArrangement property is set to YES, the stack view’s fitting size is increased to include space for the margins.

This fitting size is exactly what I need — how do I get to it?

[fatuhoku]

When you add subviews to UIStackView, it automatically resizes to accommodate the newcomer. Yet, this is not a change in intrinsic content size. How does TZStackView replicate this behaviour?

[johngibb]

I believe you're looking for systemLayoutSizeFittingSize.

For example:

let fittingSize = stackView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize)

See more at https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/systemLayoutSizeFittingSize: