更改超级视图框架后更新子视图的约束

Question

I have a UIView subclass (to deal with drag and drop) and with Interface Build I added two subviews: an UIImageView and an UILabel .

Both have constraints:

UIImageView border match the superview borders in order to fill all the available space. UILabel is centered vertical and horizontally.

Here you can see the three (superview background is green).

My problem comes when I animate a frame change in the superview. The superview seems fine, but its subviews go crazy.

Here you can see it (ignore the brown square, is from another view)

As you can see, subviews "fall" from the superview, despite I call updateConstraints on every subview.

I know it is a bad practice to mix AutoLayout with setFrame, but is the only way I know to do it.

Thanks

Answer 1

Thanks to the comments I made some changes.

1) Change the superview (the green one) with the UIImageView.

2) Remove the UILabel and use a CATextLayer to place the text, using this answer to center the text vertically in front of the UIImageView.

And now it works fine. Thanks for the help.