I have the bellow cacheManager class which I use to cache user created videos. More info on how I use it is here.
public enum Result<T> {
case success(T)
case failure(NSError)
}
class CacheManager {
static let shared = CacheManager()
private let fileManager = FileManager.default
private lazy var mainDirectoryUrl: URL = {
let documentsUrl = self.fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first!
return documentsUrl
}()
func getFileWith(stringUrl: String, completionHandler: @escaping (Result<URL>) -> Void ) {
let file = directoryFor(stringUrl: stringUrl)
//return file path if already exists in cache directory
guard !fileManager.fileExists(atPath: file.path) else {
completionHandler(Result.success(file))
return
}
DispatchQueue.global().async {
if let videoData = NSData(contentsOf: URL(string: stringUrl)!) {
videoData.write(to: file, atomically: true)
DispatchQueue.main.async {
completionHandler(Result.success(file))
}
} else {
DispatchQueue.main.async {
let error = NSError(domain: "SomeErrorDomain", code: -2001 /* some error code */, userInfo: ["description": "Can't download video"])
completionHandler(Result.failure(error))
}
}
}
}
private func directoryFor(stringUrl: String) -> URL {
let fileURL = URL(string: stringUrl)!.lastPathComponent
let file = self.mainDirectoryUrl.appendingPathComponent(fileURL)
return file
}
public func clearCache() {
//Delete Cookies
if let cookies = HTTPCookieStorage.shared.cookies {
for cookie in cookies {
NSLog("\(cookie)")
}
}
let storage = HTTPCookieStorage.shared
for cookie in storage.cookies! {
storage.deleteCookie(cookie)
}
}
}
I have now recently come across a problem which I asked about here.
To fix the problem i believe I need to clear cache. The problem is I dont know how to do this.
What I tried:
public func clearCache() {
//Delete Cookies
if let cookies = HTTPCookieStorage.shared.cookies {
for cookie in cookies {
NSLog("\(cookie)")
}
}
let storage = HTTPCookieStorage.shared
for cookie in storage.cookies! {
storage.deleteCookie(cookie)
}
}
Used like this as soon as the first instance of fetching content occurs.
CacheManager.clearCache()//Instance member 'clearCache' cannot be used on type 'CacheManager'; did you mean to use a value of this type instead?
self.getFollowers()
Some info on how I use the cache manager:
To clear the cache directory contents you can call this method with it's url
func clearContents(_ url:URL) {
do {
let contents = try FileManager.default.contentsOfDirectory(atPath: url.path)
print("before \(contents)")
let urls = contents.map { URL(string:"\(url.appendingPathComponent("\($0)"))")! }
urls.forEach { try? FileManager.default.removeItem(at: $0) }
let con = try FileManager.default.contentsOfDirectory(atPath: url.path)
print("after \(con)")
}
catch {
print(error)
}
}
To call your method
CacheManager.shared.clearCache()
But note it's code is irelevant as it has a netwrok related code , and your content is stored in cache directory