사이즈 캐싱 로직 구현 및 usesCachedViewSize 피쳐플래그 연동해요.

Sources/KarrotListKit/Extension/UIView+TraitCollection.swift .swift

@@ -0,0 +1,27 @@
+//
+//  Copyright (c) 2025 Danggeun Market Inc.
+//
+
+import UIKit
+
+extension UIView {
+
+  func shouldInvalidateContentSize(
+    previousTraitCollection: UITraitCollection?
+  ) -> Bool {
+    if traitCollection.preferredContentSizeCategory != previousTraitCollection?.preferredContentSizeCategory {
+      return true
+    }
+
+    if traitCollection.legibilityWeight != previousTraitCollection?.legibilityWeight {
+      return true
+    }
+
+    if traitCollection.horizontalSizeClass != previousTraitCollection?.horizontalSizeClass ||
+        traitCollection.verticalSizeClass != previousTraitCollection?.verticalSizeClass {
+      return true
+    }
+
+    return false
+  }
+}

Sources/KarrotListKit/View/UICollectionComponentReusableView.swift

@@ -14,6 +14,8 @@ final class UICollectionComponentReusableView: UICollectionReusableView, Compone
 
   var onSizeChanged: ((CGSize) -> Void)?
 
+  private var previousBounds: CGSize = .zero
+
   // MARK: - Initializing
 
   @available(*, unavailable)
@@ -29,6 +31,30 @@ final class UICollectionComponentReusableView: UICollectionReusableView, Compone
 
   // MARK: - Override Methods
 
+  public override func traitCollectionDidChange(
+    _ previousTraitCollection: UITraitCollection?
+  ) {
+    super.traitCollectionDidChange(previousTraitCollection)
+
+    if shouldInvalidateContentSize(
+      previousTraitCollection: previousTraitCollection
+    ) {
+      previousBounds = .zero
+    }
+  }
+
+  public override func prepareForReuse() {
+    super.prepareForReuse()
+
+    previousBounds = .zero
+  }
+
+  public override func layoutSubviews() {
+    super.layoutSubviews()
+
+    previousBounds = bounds.size
+  }
+
   override func preferredLayoutAttributesFitting(
     _ layoutAttributes: UICollectionViewLayoutAttributes
   ) -> UICollectionViewLayoutAttributes {
@@ -38,6 +64,11 @@ final class UICollectionComponentReusableView: UICollectionReusableView, Compone
       return attributes
     }
 
+    if KarrotListKitFeatureFlag.provider.isEnabled(for: .usesCachedViewSize),
+       previousBounds == attributes.size {
+      return attributes
+    }
+
     let size = renderedContent.sizeThatFits(bounds.size)
 
     if renderedComponent != nil {

Sources/KarrotListKit/View/UICollectionViewComponentCell.swift

@@ -17,6 +17,8 @@ public final class UICollectionViewComponentCell: UICollectionViewCell, Componen
 
   var onSizeChanged: ((CGSize) -> Void)?
 
+  private var previousBounds: CGSize = .zero
+
   // MARK: - Initializing
 
   @available(*, unavailable)
@@ -37,12 +39,31 @@ public final class UICollectionViewComponentCell: UICollectionViewCell, Componen
 
   // MARK: - Override Methods
 
+  public override func traitCollectionDidChange(
+    _ previousTraitCollection: UITraitCollection?
+  ) {
+    super.traitCollectionDidChange(previousTraitCollection)
+
+    if shouldInvalidateContentSize(
+      previousTraitCollection: previousTraitCollection
+    ) {
+      previousBounds = .zero
+    }
+  }
+
   public override func prepareForReuse() {
     super.prepareForReuse()
 
+    previousBounds = .zero
     cancellables?.forEach { $0.cancel() }
   }
 
+  public override func layoutSubviews() {
+    super.layoutSubviews()
+
+    previousBounds = bounds.size
+  }
+
   public override func preferredLayoutAttributesFitting(
     _ layoutAttributes: UICollectionViewLayoutAttributes
   ) -> UICollectionViewLayoutAttributes {
@@ -52,6 +73,11 @@ public final class UICollectionViewComponentCell: UICollectionViewCell, Componen
       return attributes
     }
 
+    if KarrotListKitFeatureFlag.provider.isEnabled(for: .usesCachedViewSize),
+       previousBounds == attributes.size {
+      return attributes
+    }
+
     let size = renderedContent.sizeThatFits(contentView.bounds.size)
 
     if renderedComponent != nil {