caches directory counts towards app storage?

i've created an app that measures the cache directory, and has a button to write 10MB of random data into the caches directory

1. after installing the app, documents and data say 0
2. after hitting the write to cache button in the app, documents and data reports count(button_tap)*10 MB.
3. this is the buggy behavior. it should still report 0MB

i've created an app that measures the cache directory, and has a button to write 10MB of random data into the caches directory

1. after installing the app, documents and data say 0
2. after hitting the write to cache button in the app, documents and data reports count(button_tap)*10 MB.
3. this is the buggy behavior. it should still report 0MB

//
//  ContentView.swift
//  cache-example
//
//  Created by Andrew Breckenridge on 12/4/24.
//

import SwiftUI

struct ContentView: View {
    @State private var cacheSize: String = "Cache Size: 0 MB"
    
    var body: some View {
        VStack(spacing: 20) {
            Text(cacheSize)
                .font(.system(size: 22, weight: .medium))
            
            Button(action: writeRandomDataToCache) {
                Text("Write 10MB to Cache")
                    .padding()
                    .background(Color.gray)
                    .foregroundColor(.white)
                    .cornerRadius(8)
            }
        }
        .padding()
        .onAppear(perform: updateCacheSize)
    }
    
    private func writeRandomDataToCache() {
        let data = Data(count: 10 * 1024 * 1024) // 10MB of random data
        if let cacheDirectory = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first {
            let fileURL = cacheDirectory.appendingPathComponent(UUID().uuidString)
            do {
                try data.write(to: fileURL)
                updateCacheSize()
            } catch {
                print("Error writing data to cache: \(error)")
            }
        }
    }
    
    private func updateCacheSize() {
        if let cacheDirectory = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first {
            do {
                let files = try FileManager.default.contentsOfDirectory(at: cacheDirectory, includingPropertiesForKeys: [.fileSizeKey], options: .skipsHiddenFiles)
                let totalSize = files.reduce(0) { (result, fileURL) -> Int in
                    let fileSize = (try? fileURL.resourceValues(forKeys: [.fileSizeKey]).fileSize) ?? 0
                    return result + fileSize
                }
                cacheSize = "Cache Size: \(totalSize / (1024 * 1024)) MB"
            } catch {
                print("Error calculating cache size: \(error)")
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

Yeah, we did make it clear in this tech talk that:

"As a bonus to you, files in your caches directory are not reported as part of your app's Documents & Data total. Although they are included in the overall space taken up by apps."

Now that you did see that the number listed in General > iPhone Storage > The app > Documents & Data includes the files in the caches folder, would you mind to file a feedback report with your demo project to see what the team has to say? If you do so, please share your report ID here. Thanks.

Best,
——
Ziqiao Chen
 Worldwide Developer Relations.