I created a mobile app that is very similar to PeriodicTable. but my app not run Which NSCoder type goes into parameters when invoking PeriodicTable? Sorry, my app doesn't use storyboard. And if you're using a storyboard, nothing will appear on the screen. Help me, please.

class NodeRenderer {

weak var view: MView?

fileprivate let onNodeChange: () -> Void
fileprivate let disposables = GroupDisposable()
fileprivate var active = false
weak var animationCache: AnimationCache?

init(node: Node, view: MView?, animationCache: AnimationCache?) {
    self.view = view
    self.animationCache = animationCache

    onNodeChange = { [unowned node, weak view] in
        guard let isAnimating = animationCache?.isAnimating(node) else {
            return
        }

        if isAnimating {
            return
        }

            DispatchQueue.main.async {
            print("setNeedsDisplay=6")
                view?.setNeedsDisplay()
            }
    }

    addObservers()
}

view?.setNeedsDisplay() needs to be wrapped with DispatchQueue.main.async {}. If not, we have crash for iOS 13. But after we wrap it, it is very slow when changing color of shape. I found the reason. When changing color of shape, this framework is doing rerendering for whole group using group rendering. Now it needs to be called for main thread as you can see above. But the speed is very slow because of calling main thread much time. How can we fix this issue? Please let me know if you have any thought.

I'm trying to change color of shape using following code: @discardableResult public func replaceColors(node: Node, color: Fill?) -> Bool { if let shape = node as? Shape { shape.fill = color return true } return false }

At that moment, following code will be called:

group.contentsVar.onChange { [weak self] _ in self?.updateRenderers() }

private func updateRenderers() { renderers.forEach { $0.dispose() } renderers.removeAll()

    if let updatedRenderers = group?.contents.compactMap ({ child -> NodeRenderer? in
        guard let interval = renderingInterval else {
            print("setNeedsDisplay=6-2")
            return RenderUtils.createNodeRenderer(child, view: view, animationCache: animationCache)
        }

        let index = AnimationUtils.absoluteIndex(child, useCache: true)
        if index > interval.from && index < interval.to {
            print("setNeedsDisplay=6-3")
            return RenderUtils.createNodeRenderer(child, view: view, animationCache: animationCache, interval: interval)
        }

        return .none

    }) {
        renderers = updatedRenderers
    }
}

Btw when the color of shape is changed, updateRenderers() will be called much time. It lowered the speed of the app. How can we call updateRenderers() only once for changed shape?