为什么UIView在iOS中重新布局？

Question

My Manager UIViewController is shown in attached figure. It has Draw Chart UIView and Draw Chart UIView has a small UIView inside. Draw Chart UIView's size is smaller than superview.

Draw Chart UIView has layout constraints as shown in the second figure. Small UIView has no constraints. It's locations are changed where user tap on the Draw Chart UIView. So no constraints. When I load Draw Chart UIView, it is fine and layout is same as in constraints.

The problem is when I load small UIView or keyboard appeared, Draw Chart UIView is relayout and height is taller. So DONE button is pushed to the lower position. How to prevent, even small UIView is loaded/keyboard appeared Draw Chart UIView's size and layout are not changed. Can it be done in auto layout and constraints? I can't find where to fix it? Thanks

Answer 1

尝试将主视图放在滚动视图中，将绘图图视图放在另一个滚动视图中，然后根据需要以及在键盘弹出时更改滚动视图的y位置。