Swift: How to resize UIView and keep contents centered? -

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i have uiview ("myuiview") in viewcontroller ("mainview") has uilabel ("myuilabel") inside, centered vertically autolayout constraints. i'm animating uiview change height.

originally, thought auto layout keep track of animation/change , keep uilabel centered, instead uilabel acts though constrained top of uiview.

the uilabel isn't in animation code itself. code reference:

uiview.animatewithduration(currentanimationtime, delay: 0.0, options: .curveeaseout, animations: {  self.myuiview.frame = cgrectmake(0, self.mainview.frame.height * 0.2, self.mainview.frame.width, self.mainview.frame.height * 0.6 ) }, completion: nil)

how can increase uiview's height , keep uilabel entered vertically? need add directly affects uilabel itself, or going resize (cgrectmake) wrong?

i have had luck calling layoutifneeded on animated view inside animation.

it preferable create outlet height constraint of view , set constant of constraint rather constructing cgrect. change constant outside animation demonstrated in this answer.


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