CODEWITHSUNDEEP
ios5xamarin.ios
Ian Vink
Ian Vink

Reputation: 68770

MonoTouch: Items saved to /Library/Caches never staying around

My app creates a number of items when first launched and saves them into /Library/Caches/Thumbnails

The app works great.

When I kill the app, then re-run it, those files are not there any more. This does not happen in the simulator.

I have set the no-not-backup attribute, but still when the app runs after being manually shut down, the cache is empty.

Is there a way to have the cache last a bit longer. This is data not created by the user so can't be put into /Documents.

Upvotes: 1

Views: 692

Answers (1)

poupou
poupou

Reputation: 43553

Adding the following code in my FinishedLaunching method shows a new file at each execution (both on device and on the simulator).

    string appdir = NSBundle.MainBundle.BundleUrl.Path;
    string cache = Path.GetFullPath (Path.Combine (appdir, "..", "Library", "Caches"));
    Console.WriteLine ("Files:");
    int i = 0;
    foreach (string file in Directory.GetFiles (cache, "*.txt"))
             Console.WriteLine ("{0}. {1}", i++, file);
    string fname = Path.Combine (cache, i.ToString () + ".txt");
    File.WriteAllText (fname, "cache this for later");

So it looks like iOS decided to purge the data to reclaim some space on your device (new feature in iOS 5). This won't happen for every user/devices (if enough space is available) but sadly I do not know how iOS compute this.

Do-not-backup won't help (Caches is never backed up) unless you save your data inside Documents but that could cause you other issues as well (wrt AppStore). For a lack of better answer I suggest you the same as the (previous link) blog author, fill a bug report.

Upvotes: 1

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