ios - how to find final value of proportional constaint -


i have constraint set height of view.

the constraint proportional height constraint.

i want calculate height using constraint that's want know view height.

any apis ?

i know can manually find myself using formula don't want

lets height constraint 58% of parent view , has constant value of 10 total height assigned constraint view

the height of view be:

0.58 * parentview.frame.height + 10

the height of parentview isn't established until auto layout runs, if calculation, in override of viewdidlayoutsubviews.

since aren't interested in calculating yourself, can read final frame height of view in override of viewdidlayoutsubviews runs after auto layout has applied constraints.

override func viewdidlayoutsubviews() {     super.viewdidlayoutsubviews()      // read final view size here     print(myview.frame.height) }

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