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Pods/SwiftEntryKit/Source/Utils/GradientView.swift

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+//
+//  GradientView.swift
+//  SwiftEntryKit
+//
+//  Created by Daniel Huri on 4/20/18.
+//  Copyright (c) 2018 huri000@gmail.com. All rights reserved.
+//
+
+import UIKit
+
+class GradientView: UIView {
+    
+    struct Style {
+        let gradient: EKAttributes.BackgroundStyle.Gradient
+        let displayMode: EKAttributes.DisplayMode
+        
+        init?(gradient: EKAttributes.BackgroundStyle.Gradient?,
+              displayMode: EKAttributes.DisplayMode) {
+            guard let gradient = gradient else {
+                return nil
+            }
+            self.gradient = gradient
+            self.displayMode = displayMode
+        }
+    }
+    
+    private let gradientLayer = CAGradientLayer()
+    
+    var style: Style? {
+        didSet {
+            setupColor()
+        }
+    }
+    
+    init() {
+        super.init(frame: .zero)
+        layer.addSublayer(gradientLayer)
+    }
+    
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        gradientLayer.frame = bounds
+    }
+    
+    private func setupColor() {
+        guard let style = style else {
+            return
+        }
+        gradientLayer.colors = style.gradient.colors.map {
+            $0.color(for: traitCollection, mode: style.displayMode).cgColor
+        }
+        gradientLayer.startPoint = style.gradient.startPoint
+        gradientLayer.endPoint = style.gradient.endPoint
+    }
+    
+    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+        setupColor()
+    }
+}