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If I set the capacity of the disk cache to less than 5MB, It doesn't work.
Through the print statement, I checked that the value of the currentDiskUsage did not rise at all, and I also checked that the image has been making network requests every time because there is no cached data even if I shut down and run the app again. I'm simply wondering why this is happening.
Also, I wonder what kind of eviction policy the disk cache follows.
I was so curious that I tried to find out through the link [here], but there seems to be no implementation of disk cache at all.
Below is the code I used. I'm attaching it together just in case.
import UIKit
protocol Cacheable {
func getCachedResponse(
for path: String,
completion: @escaping (Result<Data, CacheError>) -> Void
)
func save(
for path: String,
data: Data
)
}
final class CacheManager {
static let shared = CacheManager()
private let imageCache: URLCache
init() {
imageCache = URLCache(
memoryCapacity: 4 * 1024 * 1024, // 4MB
diskCapacity: 4 * 1024 * 1024 // 4MB
)
}
}
extension CacheManager: Cacheable {
func getCachedResponse(
for path: String,
completion: @escaping (Result<Data, CacheError>) -> Void
) {
if let url = URL(string: path),
let cachedResponse = imageCache.cachedResponse(for: URLRequest(url: url)) {
completion(.success(cachedResponse.data))
return
}
completion(.failure(.noCachedResponse))
}
func save(
for path: String,
data: Data
) {
guard let url = URL(string: path) else { return }
let response = URLResponse(
url: url,
mimeType: nil,
expectedContentLength: 0,
textEncodingName: nil
)
if let uiImage = UIImage(data: data),
let compressedData = uiImage.jpegData(compressionQuality: 0.8) {
#if DEBUG
let formmatter = ByteCountFormatter()
formmatter.allowedUnits = [.useMB]
formmatter.countStyle = .file
print("""
=== Original size: \(formmatter.string(fromByteCount: Int64(data.count)))
=== Cached size: \(formmatter.string(fromByteCount: Int64(compressedData.count)))
""")
#endif
let cachedResponse = CachedURLResponse(
response: response,
data: compressedData
)
imageCache.storeCachedResponse(
cachedResponse,
for: URLRequest(url: url)
)
}
}
}
Posted
by
ZENA_MOON.
Last updated
ZENA_MOON.
.
