ios - 有没有办法强制ios系统清除部分(或全部)应用程序的缓存？

Question

我的应用程序下载一些支持数据并将其保存到“库/缓存”目录。根据documentation ,

Use this directory to write any app-specific support files that your app can re-create easily. Your app is generally responsible for managing the contents of this directory and for adding and deleting files as needed. In iOS 2.2 and later, the contents of this directory are not backed up by iTunes or iCloud. In addition, the system removes files in this directory during a full restoration of the device. In iOS 5.0 and later, the system may delete the Caches directory on rare occasions when the system is very low on disk space. This will never occur while an app is running. However, be aware that restoring from backup is not necessarily the only condition under which the Caches directory can be erased.

因此，系统可能会清理此文件夹。我的应用程序的支持数据并不重要，因此无需将其放在文档或其他地方。但我想检查它如何处理“Caches”文件夹是否突然被清除。

当然，我可以使用 NSFileManager 检查文件是否存在......然后使用文件或重新下载。但这里存在一个技巧。我的应用程序可以在后台从服务器下载一些文件。下载文件时，它存储在“Caches/com.apple.nsurlsessiond/[APP_ID]”中，并且无法检查文件是否存在(因为文件在此步骤完全由 SDK 管理)。我将这种情况的错误处理添加到 NSURLSession 委托(delegate)中，现在需要在“现实生活”中检查它。

有没有办法直接或间接强制系统清除所有应用程序的“缓存”目录？

Answer 1

您可以通过以下方式删除缓存文件夹中的所有文件

    func removeNetworkCache() {
        let cachePath = (NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.cachesDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)[0])
        let appId = Bundle.main.infoDictionary!["CFBundleIdentifier"] as! String

            do {
                let content = try FileManager.default.contentsOfDirectory(atPath: cachePath)
                for file in content{
                    let fullPath = "\(cachePath)/\(appId)/\(file)"
                    try FileManager.default.removeItem(atPath: fullPath)
                }
            } catch {
               print("ERROR DESCRIPTION: \(error)")
            }
    }