Downsample OTG transfer thumbnails

suixinkan/UI/TravelAlbum/WiredCameraTransferViewController.swift

@@ -470,6 +470,7 @@ extension WiredCameraTransferViewController: UICollectionViewDelegate {
 /// 有线传输照片宫格 Cell。
 private final class WiredTransferPhotoCell: UICollectionViewCell {
     static let reuseIdentifier = "WiredTransferPhotoCell"
+    private static let previewImageSize = CGSize(width: 180, height: 180)
 
     private let imageView = UIImageView()
     private let statusLabel = UILabel()
@@ -503,7 +504,16 @@ private final class WiredTransferPhotoCell: UICollectionViewCell {
 
     func apply(item: TravelAlbumOTGPhotoItem, selectionMode: Bool, selected: Bool) {
         if let url = item.thumbnailURL {
-            imageView.kf.setImage(with: url, placeholder: UIImage(systemName: "photo"))
+            let processor = DownsamplingImageProcessor(size: Self.previewImageSize)
+            imageView.kf.setImage(
+                with: url,
+                placeholder: UIImage(systemName: "photo"),
+                options: [
+                    .processor(processor),
+                    .scaleFactor(UIScreen.main.scale),
+                    .backgroundDecode
+                ]
+            )
         } else {
             imageView.image = UIImage(systemName: "photo")
             imageView.tintColor = AppColor.textTertiary