Tweak bundle loading to support cocoapods.

ShopifyCheckoutKit.podspec

@@ -9,5 +9,7 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = "13.0"
   s.swift_version = "5.0"
   s.source_files = "Sources/ShopifyCheckoutKit/**/*.swift"
-  s.resources = "Sources/ShopifyCheckoutKit/**/*.xcassets"
+  s.resource_bundles = {
+    "ShopifyCheckoutKit" => ["Sources/ShopifyCheckoutKit/Assets.xcassets"]
+  }
 end

Sources/ShopifyCheckoutKit/Bundle.swift

@@ -0,0 +1,42 @@
+/*
+MIT License
+
+Copyright 2023 - Present, Shopify Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+import Foundation
+
+internal class ShopifyBundleFinder {}
+
+extension Bundle {
+	static var shopifyCheckoutKit: Bundle {
+	#if COCOAPODS
+		guard let cocoapodsBundle = Bundle(for: ShopifyBundleFinder.self)
+			.url(forResource: "ShopifyCheckoutKit", withExtension: "bundle")
+			.flatMap({ Bundle(url: $0) })
+		else {
+			fatalError("[cocoapods] unable to load resource bundle")
+		}
+		return cocoapodsBundle
+	#else
+		return .module // use Swift Package Manager's synthesized helper
+	#endif
+	}
+}

Sources/ShopifyCheckoutKit/SpinnerView.swift

@@ -26,7 +26,7 @@ import UIKit
 class SpinnerView: UIView {
 	private lazy var imageView: UIImageView = {
 		let view = UIImageView(image: UIImage(
-			named: "spinner", in: .module, with: nil
+			named: "spinner", in: .shopifyCheckoutKit, with: nil
 		))
 		view.translatesAutoresizingMaskIntoConstraints = false
 		return view