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Merge pull request #36 from AckeeCZ/gradient_view
Gradient view.
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| // | ||
| // GradientView.swift | ||
| // ACKategories | ||
| // | ||
| // Created by Marek Fořt on 10/5/18. | ||
| // Copyright © 2018 Ackee, s.r.o. All rights reserved. | ||
| // | ||
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| import UIKit | ||
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| /** | ||
| This view creates a gradient view with the defined colors | ||
| - Warning: Please note that if one of your colors is clear, you should usually define to which "clear color" it should go to - i.e. if you want to go from white to clear, write: | ||
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| `[UIColor.white, UIColor.white.withAlphaComponent(0)]` | ||
| */ | ||
| open class GradientView: UIView { | ||
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| private weak var gradientLayer: CAGradientLayer! | ||
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| /** | ||
| Creates a gradient view with colors and axis | ||
| - Parameters: | ||
| - colors: The colors to be used for the gradient. | ||
| - axis: The axis of the gradient: `.vertical` for bottom-to-top gradient, `.horizontal` for left-to-right gradient. | ||
| */ | ||
| public init(colors: [UIColor], axis: NSLayoutConstraint.Axis) { | ||
| super.init(frame: CGRect(x: 0, y: 0, width: 1, height: 1)) | ||
| let gradientLayer = CAGradientLayer() | ||
| gradientLayer.frame = bounds | ||
| gradientLayer.colors = colors.map { $0.cgColor } | ||
| if axis == .vertical { | ||
| gradientLayer.startPoint = CGPoint(x: 0.5, y: 0) | ||
| gradientLayer.endPoint = CGPoint(x: 0.5, y: 1) | ||
| } else { | ||
| gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5) | ||
| gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5) | ||
| } | ||
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| layer.insertSublayer(gradientLayer, at: 0) | ||
| self.gradientLayer = gradientLayer | ||
| } | ||
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| required public init?(coder aDecoder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
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| override open func layoutSubviews() { | ||
| super.layoutSubviews() | ||
| gradientLayer.frame = bounds | ||
| } | ||
| } |
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