packages/ios_platform_images/ios/Classes/UIImageIosPlatformImages.swift

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import Flutter
import Foundation
import UIKit

@objc extension UIImage {
  /// Loads a UIImage from the embedded Flutter project's assets.
  ///
  /// This method loads the Flutter asset that is appropriate for the current
  /// screen.  If you are on a 2x retina device where usually `UIImage` would be
  /// loading `@2x` assets, it will attempt to load the `2.0x` variant.  It will
  /// load the standard image if it can't find the `2.0x` variant.
  ///
  /// For example, if your Flutter project's `pubspec.yaml` lists "assets/foo.png"
  /// and "assets/2.0x/foo.png", calling
  /// `[UIImage flutterImageWithName:@"assets/foo.png"]` will load
  /// "assets/2.0x/foo.png".
  ///
  /// See also https://flutter.dev/docs/development/ui/assets-and-images
  ///
  /// Note: We don't yet support images from package dependencies (ex.
  /// `AssetImage('icons/heart.png', package: 'my_icons')`).
  public static func flutterImageWithName(_ name: String) -> UIImage? {
    let filename = (name as NSString).lastPathComponent
    let path = (name as NSString).deletingLastPathComponent

    for screenScale in stride(from: Int(UIScreen.main.scale), to: 1, by: -1) {
      // TODO(hellohuanlin): Fix duplicate slashes in this path construction.
      let key = FlutterDartProject.lookupKey(forAsset: "\(path)/\(screenScale).0x/\(filename)")
      if let image = UIImage(named: key, in: Bundle.main, compatibleWith: nil) {
        return image
      }
    }

    let key = FlutterDartProject.lookupKey(forAsset: name)
    return UIImage(named: key, in: Bundle.main, compatibleWith: nil)
  }
}