yattee/Backports/VisualEffectBlur-iOS.swift
2023-10-15 14:08:08 +02:00

98 lines
4.2 KiB
Swift

/*
Copyright © 2020 Apple Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
import SwiftUI
#if os(iOS)
public struct VisualEffectBlur<Content: View>: View {
/// Defaults to .systemMaterial
var blurStyle: UIBlurEffect.Style
/// Defaults to nil
var vibrancyStyle: UIVibrancyEffectStyle?
var content: Content
public init(blurStyle: UIBlurEffect.Style = .systemMaterial, vibrancyStyle: UIVibrancyEffectStyle? = nil, @ViewBuilder content: () -> Content) {
self.blurStyle = blurStyle
self.vibrancyStyle = vibrancyStyle
self.content = content()
}
public var body: some View {
Representable(blurStyle: blurStyle, vibrancyStyle: vibrancyStyle, content: ZStack { content })
.accessibility(hidden: Content.self == EmptyView.self)
}
}
// MARK: - Representable
extension VisualEffectBlur {
struct Representable<Content: View>: UIViewRepresentable {
var blurStyle: UIBlurEffect.Style
var vibrancyStyle: UIVibrancyEffectStyle?
var content: Content
func makeUIView(context: Context) -> UIVisualEffectView {
context.coordinator.blurView
}
func updateUIView(_: UIVisualEffectView, context: Context) {
context.coordinator.update(content: content, blurStyle: blurStyle, vibrancyStyle: vibrancyStyle)
}
func makeCoordinator() -> Coordinator {
Coordinator(content: content)
}
}
}
// MARK: - Coordinator
extension VisualEffectBlur.Representable {
class Coordinator {
let blurView = UIVisualEffectView()
let vibrancyView = UIVisualEffectView()
let hostingController: UIHostingController<Content>
init(content: Content) {
hostingController = UIHostingController(rootView: content)
hostingController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
hostingController.view.backgroundColor = nil
blurView.contentView.addSubview(vibrancyView)
blurView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
vibrancyView.contentView.addSubview(hostingController.view)
vibrancyView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
}
func update(content: Content, blurStyle: UIBlurEffect.Style, vibrancyStyle: UIVibrancyEffectStyle?) {
hostingController.rootView = content
let blurEffect = UIBlurEffect(style: blurStyle)
blurView.effect = blurEffect
if let vibrancyStyle {
vibrancyView.effect = UIVibrancyEffect(blurEffect: blurEffect, style: vibrancyStyle)
} else {
vibrancyView.effect = nil
}
hostingController.view.setNeedsDisplay()
}
}
}
extension VisualEffectBlur where Content == EmptyView {
init(blurStyle: UIBlurEffect.Style = .systemMaterial) {
self.init(blurStyle: blurStyle, vibrancyStyle: nil) {
EmptyView()
}
}
}
#endif