How to know when active regions are changing?

UI Frameworks UIKit
gelosi OP
Created 12h
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This post is from the Activity iPhone Duo UIKit Q&A.

Hinge interaction, layoutSubviews, etc – when we're supposed to get notified, and react to the change of pose/layout?

Answered by DTS Engineer in 906445022

Hi @gelosi, @KT_ ,

To identify when active reserved regions are changing in a SwiftUI view, follow these steps:

  1. Use a GeometryReader to access a GeometryProxy instance within your view hierarchy.
  2. Call reservedRegions(kind:options:layoutDirectionBehavior:) on the proxy to retrieve an array of ReservedRegion instances.
  3. Specify a ReservedRegion.Kind such as .occlusion or .division to filter the queried regions.

To monitor and respond to changing reserved regions in a UIKit application, follow these steps:

  1. Access the target UIView instance where you need to avoid hardware occlusions or folds.
  2. Call reservedRegions(kind:options:) on the view.
  3. Pass a UIView.ReservedRegion.Kind value to inspect active or inactive frames for divisions and occlusions.

Note: UIKit provides methods and closures in several objects where automatic observation tracking happens, including for trait collection changes and updates to a view's layout or display. To learn more, see Updating views automatically with observation tracking in UIKit.

In addition to querying reserved regions directly, you can observe changes to the physical state and angle of the hinge to track when active regions shift. In SwiftUI, use the onHingeChange(isEnabled:_:) view modifier to receive updates through DeviceHingeContext. See SwiftUI updates for more details.

In UIKit, add a UIHingeInteraction to the view hierarchy to observe updates. The interaction handler delivers a UIHingeInteraction.Update containing the current UIHinge status, such as .closed, .partiallyOpen, or .fullyOpen. To learn more, see UIKit updates.

Cheers,

Paris X Pinkney |  WWDR | DTS Engineer

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KT_ OP
12h

I have same question here but have no idea how to get it to show up in this Q/A section.

What view lifecycle gets triggered by the divisionReservedRegion becoming active or inactive (when should I inspect?)? Is there a way to make it a trait so I can registerForTraitChanges (like UITraitCollection.systemTraitsAffectingVerticalBarEdge)? Can I KVO it somehow?

DTS Engineer OP
Apple
12h
Recommended

Hi @gelosi, @KT_ ,

To identify when active reserved regions are changing in a SwiftUI view, follow these steps:

  1. Use a GeometryReader to access a GeometryProxy instance within your view hierarchy.
  2. Call reservedRegions(kind:options:layoutDirectionBehavior:) on the proxy to retrieve an array of ReservedRegion instances.
  3. Specify a ReservedRegion.Kind such as .occlusion or .division to filter the queried regions.

To monitor and respond to changing reserved regions in a UIKit application, follow these steps:

  1. Access the target UIView instance where you need to avoid hardware occlusions or folds.
  2. Call reservedRegions(kind:options:) on the view.
  3. Pass a UIView.ReservedRegion.Kind value to inspect active or inactive frames for divisions and occlusions.

Note: UIKit provides methods and closures in several objects where automatic observation tracking happens, including for trait collection changes and updates to a view's layout or display. To learn more, see Updating views automatically with observation tracking in UIKit.

In addition to querying reserved regions directly, you can observe changes to the physical state and angle of the hinge to track when active regions shift. In SwiftUI, use the onHingeChange(isEnabled:_:) view modifier to receive updates through DeviceHingeContext. See SwiftUI updates for more details.

In UIKit, add a UIHingeInteraction to the view hierarchy to observe updates. The interaction handler delivers a UIHingeInteraction.Update containing the current UIHinge status, such as .closed, .partiallyOpen, or .fullyOpen. To learn more, see UIKit updates.

Cheers,

Paris X Pinkney |  WWDR | DTS Engineer

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