material-components_material-components-ios/components/Palettes/examples/PalettesExpandedExample.swift

/*
Copyright 2016-present the Material Components for iOS authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import MaterialComponents

private func randomFloat() -> CGFloat {
  return CGFloat(arc4random()) / CGFloat(UInt32.max)
}

private func generateRandomPalettes(_ count: Int) -> [(name: String, palette: MDCPalette)] {
  var palettes = [(name: String, palette: MDCPalette)]()
  for _ in 1...count {
    let rgb = [randomFloat(), randomFloat(), randomFloat()]
    let name = String(format: "Generated from #%2X%2X%2X",
                      Int(rgb[0] * 255),
                      Int(rgb[1] * 255),
                      Int(rgb[2] * 255))
    let color = UIColor.init(red: rgb[0], green: rgb[1], blue: rgb[2], alpha: 1)
    palettes.append((name, MDCPalette.init(generatedFrom: color)))
  }
  return palettes
}

class PalettesGeneratedExampleViewController: PalettesExampleViewController {
  fileprivate let numPalettes = 10

  convenience init() {
    self.init(style: .grouped)
    self.palettes = generateRandomPalettes(numPalettes)
  }
}

// MARK: - Catalog by convention
extension PalettesGeneratedExampleViewController {
  @objc class func catalogBreadcrumbs() -> [String] {
    return ["Palettes", "Generated Palettes"]
  }

  @objc class func catalogIsPrimaryDemo() -> Bool {
    return false
  }

  @objc class func catalogIsPresentable() -> Bool {
    return true
  }
}