如何使用 Catalyst 实现 onHover 事件?

问题描述

是否可以使用 swiftUI 使用 Catalyst 进行鼠标 onHover 事件?

Is it possible for a mouse onHover event with Catalyst using swiftUI?

onHover(perform:) 仅适用于 macOS 现在.

推荐答案

这是 Catalyst 的干净解决方案，但 iPadOS/Catalyst 13.4 可能很快就会推出.在任何情况下都使用相同的:

Here's a clean solution for Catalyst, but this might be coming soon in iPadOS/Catalyst 13.4. Use the same in any case:

someView.onHover2 { doSomething(isHovering: $0) }

支持此功能的代码:

import SwiftUI

extension View {
    func onHover2(perform action: @escaping (Bool) -> Void) -> some View {
        return self.overlay(HoverRecognizer(action: action))
    }
}

public struct HoverRecognizer: UIViewRepresentable {

    var action: (Bool) -> Void

    public func makeUIView(context: Context) -> UIView {
        return HoverView(action)
    }

    public func updateUIView(_ uiView: UIView, context: Context) {
    }

    private class HoverView: UIView {
        var action: (Bool) -> Void

        init(_ action: @escaping (Bool) -> Void) {
            self.action = action
            super.init(frame: CGRect.zero)

            self.addGestureRecognizer(UIHoverGestureRecognizer(
                target: self,
                action: #selector(hovering(_:))))
        }

        required init?(coder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }

        @objc
        func hovering(_ recognizer: UIHoverGestureRecognizer) {
            switch recognizer.state {
                case .began, .changed:
                    action(true)
                case .ended:
                    action(false)
                default:
                    break
            }
        }
    }
}

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