Update intrinsic height of view based off new layout constraints

[daihovey]

Description

While using an intrinsic layout (IntrinsicPanelLayout see below) I would like to update the content inside the view, which can mean a change in height. Is it possible to tell the layout adaptor to recalculate its constraints based off the content's new height. I've tried fpc.invalidateLayout() after setting up the new constraints, but the height of the fpc remains the same.

class IntrinsicPanelLayout: FloatingPanelBottomLayout {
    override var initialState: FloatingPanelState { .full }
    override var anchors: [FloatingPanelState: FloatingPanelLayoutAnchoring] {
        [
            .full: FloatingPanelIntrinsicLayoutAnchor(absoluteOffset: 0.0, referenceGuide: .safeArea)
        ]
    }
}

Thanks 🙏

How do you display panel(s)?

• Present modally

How many panels do you displays?

• 1

Environment

Library version
2.3.0
Installation method

• CocoaPods

iOS version(s)
14.0

Xcode version
12.4

[daihovey]

Possibly related to #208

[scenee]

Does your code call layoutIfNeeded() of the root view of the content whose constraints are changed before calling fpc.invalidateLayout()? I suspect that SurfaceView.intrinsicContentSize hugging the content isn't changed before calling fpc.invalidateLayout().

[daihovey]

Yep

buttonHeightContraint.constant = 100

UIView.animate(withDuration: 0.2) {
      self.view.layoutIfNeeded()
      self.fpc.invalidateLayout()
}

[daihovey]

Realised it was my fault: Autolayout broke within the StackView 🤦‍♀️.