i've created an app that measures the cache directory, and has a button to write 10MB of random data into the caches directory
after installing the app, documents and data say 0
after hitting the write to cache button in the app, documents and data reports count(button_tap)*10 MB.
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()
}
}
asbreckenridge
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i've created an app that measures the cache directory, and has a button to write 10MB of random data into the caches directory
after installing the app, documents and data say 0
after hitting the write to cache button in the app, documents and data reports count(button_tap)*10 MB.
this is the buggy behavior. it should still report 0MB