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我是 AsyncDisplayKit 的新手。所以，我创建了一个新的应用程序来学习基于我真实项目代码的 AsyncDisplayKit animationTransition。显示/隐藏动画效果完美，但我不知道为什么父节点（ASDisplayNode）在孩子隐藏时没有重新调整布局（对不起，如果我的英语不好）

我已经尝试将 setNeedsLayout() 放在 transitionLayout 测量完成上，但没有任何改变

import AsyncDisplayKit

class HomeView: ASDisplayNode {
    let topWrapperNode: TopWrapperNode
    let loginButtonNode: LoginButtonNode

    override required init() {
        self.topWrapperNode = TopWrapperNode()
        self.loginButtonNode = LoginButtonNode()

        super.init()

        self.automaticallyManagesSubnodes = true
        self.automaticallyRelayoutOnSafeAreaChanges = true
        self.insetsLayoutMarginsFromSafeArea = true
    }

    override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
        let verticalStackSpec = ASStackLayoutSpec.vertical()

        verticalStackSpec.children = [
            self.topWrapperNode,
            self.loginButtonNode
        ]
        verticalStackSpec.alignItems = .stretch
        verticalStackSpec.justifyContent = .spaceBetween

        let displayInset = ASInsetLayoutSpec(
            insets: UIEdgeInsets(top: 0, left: 32, bottom: 16, right: 32),
            child: verticalStackSpec
        )

        return ASInsetLayoutSpec(insets: safeAreaInsets, child: displayInset)
    }

    func keyboardShowUpdateLayout(keyboardHeight: CGFloat) {
//        self.topWrapperNode.hideWelcomeLabelNode()
    }

    func keyboardHideUpdateLayout() {
//        self.topWrapperNode.showWelcomeLabelNode()
    }
}

// MARK - TopWrapperNode
class TopWrapperNode: ASDisplayNode {
    let welcomeLabelNode: WelcomeLabelNode
//    let textFieldNode: TextFieldNode

    override required init() {
        welcomeLabelNode = WelcomeLabelNode()
//        textFieldNode = TextFieldNode()

        super.init()

        self.automaticallyManagesSubnodes = true
        self.autoresizesSubviews = true
    }

    override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
        let verticalStackSpec = ASStackLayoutSpec.vertical()

        verticalStackSpec.children = [
            self.logoImage,
            self.welcomeLabelNode,
//            self.textFieldNode,
        ]
        verticalStackSpec.alignItems = .stretch
        verticalStackSpec.justifyContent = .spaceBetween

        self.backgroundColor = .yellow

        let displayInset = ASInsetLayoutSpec(
            insets: UIEdgeInsets(top: 24, left: 0, bottom: 0, right: 0),
            child: verticalStackSpec
        )

        return ASInsetLayoutSpec(insets: safeAreaInsets, child: displayInset)
    }

    private let logoImage: ASImageNode = {
        let imageNode = ASImageNode()

        imageNode.image = UIImage(named: "logo")
        imageNode.frame.size = CGSize(
            width: CGFloat(SizeScaler().moderateScale(size: 98)),
            height: CGFloat(SizeScaler().moderateScale(size: 48))
        )
        imageNode.contentMode = .scaleAspectFill
        imageNode.style.alignSelf = .center

        return imageNode
    }()

    func hideWelcomeLabelNode() {
        self.welcomeLabelNode.setHide(visibility: true)
        self.welcomeLabelNode.transitionLayout(withAnimation: true, shouldMeasureAsync: false)
    }

    func showWelcomeLabelNode() {
        self.welcomeLabelNode.setHide(visibility: false)
        self.welcomeLabelNode.transitionLayout(withAnimation: true, shouldMeasureAsync: false)
    }
}

// MARK: - WelcomeLabel
class WelcomeLabelNode: ASDisplayNode {
    var isHide: Bool = false

    override required init() {
        super.init()

        self.automaticallyManagesSubnodes = true
        self.autoresizesSubviews = true
        self.shouldAnimateSizeChanges = true
    }

    override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
        let verticalStackSpec = ASStackLayoutSpec.vertical()

        verticalStackSpec.children = [self.welcomeTitleLabel, self.welcomeDescLabel]
        verticalStackSpec.alignItems = .start

        self.backgroundColor = .green

        return ASInsetLayoutSpec(
            insets: UIEdgeInsets(top: 0, left: 0, bottom: 40, right: 0),
            child: verticalStackSpec
        )
    }

    override func animateLayoutTransition(_ context: ASContextTransitioning) {
        if (self.isHide) {
            let initialTitle = context.initialFrame(for: self.welcomeTitleLabel)
            let initialDesc = context.initialFrame(for: self.welcomeDescLabel)

            self.welcomeTitleLabel.alpha = 1
            self.welcomeTitleLabel.frame = initialTitle
            self.welcomeDescLabel.alpha = 1
            self.welcomeDescLabel.frame = initialDesc

            var finalTitle = context.finalFrame(for: self.welcomeTitleLabel)
            finalTitle.origin.y -= 50
            var finalDesc = context.finalFrame(for: self.welcomeDescLabel)
            finalDesc.origin.y -= 50

            UIView.animate(withDuration: 0.4, animations: {
                self.welcomeTitleLabel.alpha = 0
                self.welcomeTitleLabel.frame = finalTitle
                self.welcomeDescLabel.alpha = 0
                self.welcomeDescLabel.frame = finalDesc
            }, completion: { finished in
                context.completeTransition(finished)
            })
        } else {
            var finalTitle = context.finalFrame(for: self.welcomeTitleLabel)
            finalTitle.origin.y -= 50
            var finalDesc = context.finalFrame(for: self.welcomeDescLabel)
            finalDesc.origin.y -= 50

            self.welcomeTitleLabel.alpha = 0
            self.welcomeTitleLabel.frame = finalTitle
            self.welcomeDescLabel.alpha = 0
            self.welcomeDescLabel.frame = finalDesc

            let initialTitle = context.initialFrame(for: self.welcomeTitleLabel)
            let initialDesc = context.initialFrame(for: self.welcomeDescLabel)

            UIView.animate(withDuration: 0.4, animations: {
                self.welcomeTitleLabel.alpha = 1
                self.welcomeTitleLabel.frame = initialTitle
                self.welcomeDescLabel.alpha = 1
                self.welcomeDescLabel.frame = initialDesc
            }, completion: { finished in
                context.completeTransition(finished)
            })
        }
    }

    let welcomeTitleLabel: QlueWorkLabel = {
        let label = QlueWorkLabel()

        label.setFont34(text: "Selamat datang!", fontType: "medium")
        label.textContainerInset = UIEdgeInsets(top: 32, left: 0, bottom: 8, right: 0)
        label.style.flexGrow = 1
        label.style.flexShrink = 1
        label.backgroundColor = .cyan

        return label
    }()

    let welcomeDescLabel: QlueWorkLabel = {
        let label = QlueWorkLabel()

        label.setFont16or20(
            text: "Pantau pekerjaanmu lebih mudah dengan QlueWork",
            fontType: "regular"
        )
        label.style.flexGrow = 1
        label.style.flexShrink = 1
        label.backgroundColor = .blue

        return label
    }()

    func setHide(visibility: Bool) {
        self.isHide = visibility
    }
}

我希望父节点在子节点像 flexBox 一样隐藏/显示时重新调整布局。谁能帮助我或告诉我为什么我做错了？

4

1 回答 1

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渲染完成后，您不能期望parentNode通过更改其子尺寸来调整自身

但你可以做一些工作，要求parentNode像这样重新渲染自己

DispatchQueue.main.async{
     parentNode.transitionLayout(withAnimation: false,
                            shouldMeasureAsync: true, 
                            measurementCompletion: nil)           
}

确保继续transitionLayout运行main thread

快乐纹理

于 2019-07-20T15:27:26.390 回答