61 lines
1.9 KiB
Swift
61 lines
1.9 KiB
Swift
//
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// ZoomableScrollView.swift
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// SimpleX
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//
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// Created by Evgeny on 13/05/2022.
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// Copyright © 2022 SimpleX Chat. All rights reserved.
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//
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import SwiftUI
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struct ZoomableScrollView<Content: View>: UIViewRepresentable {
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private var content: Content
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init(@ViewBuilder content: () -> Content) {
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self.content = content()
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}
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func makeUIView(context: Context) -> UIScrollView {
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// set up the UIScrollView
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let scrollView = UIScrollView()
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scrollView.delegate = context.coordinator // for viewForZooming(in:)
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scrollView.maximumZoomScale = 20
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scrollView.minimumZoomScale = 1
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scrollView.bouncesZoom = true
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scrollView.backgroundColor = .black
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scrollView.insetsLayoutMarginsFromSafeArea = false
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// create a UIHostingController to hold our SwiftUI content
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let hostedView = context.coordinator.hostingController.view!
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hostedView.translatesAutoresizingMaskIntoConstraints = true
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hostedView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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hostedView.frame = scrollView.bounds
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scrollView.addSubview(hostedView)
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return scrollView
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}
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func makeCoordinator() -> Coordinator {
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Coordinator(hostingController: UIHostingController(rootView: self.content))
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}
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func updateUIView(_ uiView: UIScrollView, context: Context) {
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// update the hosting controller's SwiftUI content
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context.coordinator.hostingController.rootView = self.content
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assert(context.coordinator.hostingController.view.superview == uiView)
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}
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// MARK: - Coordinator
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class Coordinator: NSObject, UIScrollViewDelegate {
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var hostingController: UIHostingController<Content>
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init(hostingController: UIHostingController<Content>) {
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self.hostingController = hostingController
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}
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func viewForZooming(in scrollView: UIScrollView) -> UIView? {
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hostingController.view
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}
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}
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}
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