Unable to change PullUpController's height dynamically

[rajeshkumar71190]

I have a UILabel with numberOfLines set to 0. Its height constraint is >=30. I want to change pullUpController's height depends on its subview's height. I don't have any method to call after the layout is updated.

[MarioIannotta]

Hello there,
did you try using the method updatePreferredFrameIfNeeded(animated: Bool)?
Note that you should update pullUpControllerPreferredSize (or pullUpControllerPreferredLandscapeFrame) before call that method.

[rajeshkumar71190]

Yes. I have this code in ChildVC:PullUpController

override var pullUpControllerPreferredSize: CGSize {
    if #available(iOS 11.0, *) {
        return CGSize(width: UIScreen.main.bounds.width, height: contentView.bounds.height + self.view.safeAreaInsets.bottom)
    } else {
        return CGSize(width: UIScreen.main.bounds.width, height: contentView.bounds.height + self.bottomLayoutGuide.length)
    }
}
override func viewDidLayoutSubviews() {
    updatePreferredFrameIfNeeded(animated: true)
}

But ChildVC's y posistion is maxY in parent view controller.
Parent view controller's frame -> (0,0,414,736)
Child view controller's frame -> (0,736,414,0)
Child view controller's subview frame -> (0,-268,414,268)//268 is contentView.bounds.height

[adrianmacarenco]

Hi @MarioIannotta
Is there a way to do it?
I am trying to do something similar where I want to expand the pullUpControllerPreferredSize (height) manually but it doesn't work.

public override var pullUpControllerPreferredSize: CGSize {
return CGSize(width: UIScreen.main.bounds.width, height: maxHeight)
}

Then I am changing the maxHeight value and calling:

viewController.updatePreferredFrameIfNeeded(animated: true)

The viewController doesn't update its height. Is that possible to do?