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Apply blur when appearance changes #3

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Apply blur when appearance changes #3

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38 changes: 29 additions & 9 deletions Sources/VariableBlurView.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -60,13 +60,36 @@ import SwiftUI

/// A variable blur view.
public class VariableBlurUIView: UIVisualEffectView {
private let gradientMask: UIImage
private let maxBlurRadius: CGFloat
private let filterType: String

public init(
gradientMask: UIImage,
maxBlurRadius: CGFloat = 20,
filterType: String = "variableBlur"
) {
self.gradientMask = gradientMask
self.maxBlurRadius = maxBlurRadius
self.filterType = filterType

super.init(effect: UIBlurEffect(style: .regular))

applyVariableBlur()
}

@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}

private func applyVariableBlur() {
/// Get rid of the visual effect view's dimming/tint view, so we don't see a hard line.
if subviews.indices.contains(1) {
let tintOverlayView = subviews[1]
tintOverlayView.alpha = 0
}

/// This is a private QuartzCore class, encoded in base64.
///
/// CAFilter
Expand Down Expand Up @@ -137,12 +160,6 @@ public class VariableBlurUIView: UIVisualEffectView {
variableBlur.setValue(gradientImageRef, forKey: "inputMaskImage")
variableBlur.setValue(true, forKey: "inputNormalizeEdges")

/// Get rid of the visual effect view's dimming/tint view, so we don't see a hard line.
if subviews.indices.contains(1) {
let tintOverlayView = subviews[1]
tintOverlayView.alpha = 0
}

/// We use a `UIVisualEffectView` here purely to get access to its `CABackdropLayer`,
/// which is able to apply various, real-time CAFilters onto the views underneath.
let backdropLayer = subviews.first?.layer
Expand All @@ -151,9 +168,12 @@ public class VariableBlurUIView: UIVisualEffectView {
backdropLayer?.filters = [variableBlur]
}

@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
public override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
if traitCollection.hasDifferentColorAppearance(comparedTo: previousTraitCollection) {
/// We have to re-apply when the appearance changes because the view updates its filters.
self.applyVariableBlur()
}
}
}

Expand Down