Do you retain a reference to your content (RealityViewContent) events? For example, the Manipulation Events docs from Apple use _ to discard the result. In theory the event should keep working while the content is alive.
_ = content.subscribe(to: ManipulationEvents.WillBegin.self) { event in
event.entity.components[ModelComponent.self]?.materials[0] = SimpleMaterial(color: .blue, isMetallic: false)
}
_ = content.subscribe(to: ManipulationEvents.WillEnd.self) { event in
event.entity.components[ModelComponent.self]?.materials[0] = SimpleMaterial(color: .red, isMetallic: false)
}
We could store these events in state. I've seen this in a few samples and apps.
@State var beginSubscription: EventSubscription?
...
beginSubscription = content.subscribe(to: ManipulationEvents.WillBegin.self) { event in
event.entity.components[ModelComponent.self]?.materials[0] = SimpleMaterial(color: .blue, isMetallic: false)
}
The main advantage I see is that we can be more explicit about when we remove the event. Are there other reasons to keep a reference to these events?
Hello @radicalappdev,
The main advantage I see is that we can be more explicit about when we remove the event.
Correct, if you store the subscription, you can cancel it explicitly.
Are there other reasons to keep a reference to these events?
I'm not aware of any other reason you might want to store the subscription.
-- Greg
