[ios_platform_images] migrate objC to swift

packages/ios_platform_images/example/ios/RunnerTests/IosPlatformImagesTests.swift

@@ -26,25 +26,22 @@ class IosPlatformImagesTests: XCTestCase {
   }
 
   func testResolveURL() {
-    let resourceName = "textfile"
-    let extensionName: String? = nil
     do {
-      let url = try plugin.resolveUrl(resourceName: resourceName, extension: extensionName)
+      let url = try plugin.resolveUrl(resourceName: "textfile", extension: nil)
       XCTAssertNotNil(url)
-      XCTAssertTrue(url!.contains(resourceName))
+      XCTAssertTrue(url?.contains("textfile") ?? false)
     } catch {
       XCTFail("Error while resolving URL: \(error)")
     }
   }
 
   func testResolveURLNotFound() {
-    let resourceName = "notFound"
-    let extensionName: String? = nil
     do {
-      let url = try plugin.resolveUrl(resourceName: resourceName, extension: extensionName)
+      let url = try plugin.resolveUrl(resourceName: "notFound", extension: nil)
       XCTAssertNil(url)
     } catch {
       XCTFail("Error while resolving URL: \(error)")
     }
   }
+
 }

packages/ios_platform_images/ios/Classes/UIImageIosPlatformImages.swift

@@ -23,12 +23,12 @@ import UIKit
   ///
   /// 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): This should be fixed, because it's path uses double slash.
       let key = FlutterDartProject.lookupKey(forAsset: "\(path)/\(screenScale).0x/\(filename)")
       if let image = UIImage(named: key, in: Bundle.main, compatibleWith: nil) {
         return image