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@geek1706
Created January 15, 2019 02:21
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import UIKit
final class LinearGradientLayer: CALayer {
enum Direction {
case vertical
case horizontal
case custom(start: CGPoint, end: CGPoint)
var points: (start: CGPoint, end: CGPoint) {
switch self {
case .vertical:
return (CGPoint(x: 0.5, y: 0.0), CGPoint(x: 0.5, y: 1.0))
case .horizontal:
return (CGPoint(x: 0.0, y: 0.5), CGPoint(x: 1.0, y: 0.5))
case let .custom(start, end):
return (start, end)
}
}
}
var direction: Direction = .vertical
var colorSpace = CGColorSpaceCreateDeviceRGB()
var colors: [CGColor]?
var locations: [CGFloat]?
var options: CGGradientDrawingOptions = CGGradientDrawingOptions(rawValue: 0)
required override init() {
super.init()
masksToBounds = true
needsDisplayOnBoundsChange = true
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
required override init(layer: Any) {
super.init(layer: layer)
}
override func draw(in ctx: CGContext) {
ctx.saveGState()
guard let colors = colors, let gradient = CGGradient(colorsSpace: colorSpace,
colors: colors as CFArray, locations: locations) else { return }
let points = direction.points
ctx.drawLinearGradient(
gradient,
start: transform(points.start),
end: transform(points.end),
options: options
)
}
private func transform(_ point: CGPoint) -> CGPoint {
return CGPoint(x: bounds.width * point.x, y: bounds.height * point.y)
}
}
final class GradientView: UIView {
lazy var gradientLayer: LinearGradientLayer = {
let gradientLayer = LinearGradientLayer()
gradientLayer.colors = [UIColor(red: 81/255, green: 194/255, blue: 138/255, alpha: 1).cgColor, UIColor(red: 96/255, green: 227/255, blue: 161/255, alpha: 1).cgColor]
return gradientLayer
}()
override init(frame: CGRect) {
super.init(frame: frame)
layer.insertSublayer(gradientLayer, at: 0)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
layer.insertSublayer(gradientLayer, at: 0)
}
override func layoutSubviews() {
super.layoutSubviews()
gradientLayer.frame = bounds
}
}
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