1f3ceac66c
GradientView would not work if its colors were passed during initialization and never changed after. This was caused by the fact that `CAGradientLayer`'s colors were updated in `GradientView.colors.didSet`, which isn't called during `init()`. Also allow access to `GradientView.gradientLayer` so that users of that class can build more advanced gradients.
42 lines
1.1 KiB
Swift
42 lines
1.1 KiB
Swift
//
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// Copyright (c) 2022 Open Whisper Systems. All rights reserved.
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//
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public class GradientView: UIView {
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public let gradientLayer = CAGradientLayer()
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public var colors: [(color: UIColor, location: Double)] {
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didSet {
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updateColors()
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}
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}
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public convenience init(from fromColor: UIColor, to toColor: UIColor) {
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self.init(colors: [
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(color: fromColor, location: 0),
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(color: toColor, location: 1)
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])
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}
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public required init(colors: [(color: UIColor, location: Double)]) {
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self.colors = colors
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super.init(frame: .zero)
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updateColors()
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layer.addSublayer(gradientLayer)
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}
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public required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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public override func layoutSubviews() {
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super.layoutSubviews()
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gradientLayer.frame = self.bounds
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}
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private func updateColors() {
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gradientLayer.colors = colors.map { $0.color.cgColor }
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gradientLayer.locations = colors.map { NSNumber(value: $0.location) }
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}
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}
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