NSKeyedUnarchiver - delete decoded data?

Question

I couldn't get any replies on my previous (related) question, so I'm wondering if slightly paraphrasing it will be of any help.

I'm encoding a few complex objects with NSKeyedArchiver and saving it to disk. Say, something like -

Class member {
    int *id;
    NSString *name;
    NSMutableArray *array;
    TempClass *object;
}

The functionality I'm trying to build is for the user to be able to save his work, lets say, while creating a new member and come back to it later. When the user finishes up, he clicks post and the data will be transmitted to a web service. If not, he just clicks save and leaves the screen and the data is persisted, so that the app can resume from that point when the user comes back. Now, once I've posted the data to the web service, I do not want to keep the data in the disk anymore and I can't really find a way to delete it.

Now, my encoding and decoding classes are functioning fine. I can use NSKeyedArchiver to save the data to disk and retrieve it using NSKeyedUnarchiver. But, my question is, how can I delete the data that I don't need anymore? Do I have to manually delete the file on the disk? Is there any way to get NSKeyedUnarchiver to delete the data that's it's returning?

Thanks,
Teja.

score 22 · Accepted Answer · edited Apr 08 '15 at 21:55

22

A very simple way to just delete it programmatically once you have posted the data:

- (BOOL) deleteFile:(NSString *) pathOfFileToDelete error:(NSError *)err {
    BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath: pathOfFileToDelete];
    if(exists) { 
        [[NSFileManager defaultManager]removeItemAtPath: pathOfFileToDelete error:err];
    }
    return exists;
}

edited Apr 08 '15 at 21:55

Kerem Baydoğan

9,716
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answered Jul 25 '10 at 11:53

Frank C.

6,563
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1

Thanks. But, How do I get the name of the file? If I archive multiple objects, will they get saved as multiple files? – Tejaswi Yerukalapudi Jul 25 '10 at 18:58
1

Okay, realized that was a stupid question. I'm not rewriting my save code to write to a different file for each archive I create. I can then delete them whenever I want to. – Tejaswi Yerukalapudi Jul 26 '10 at 19:55

score 8 · Answer 2 · answered Jul 13 '17 at 10:12

8

A Swift3 example:

do {
 try FileManager.default.removeItem(atPath: path)
} catch {
 // catch potential error
}

answered Jul 13 '17 at 10:12

mrc5

79
3
3

score 5 · Answer 3 · answered Mar 04 '16 at 13:31

For Swift 2.0:

func deleteFile(path: String) -> Bool{
    let exists = NSFileManager.defaultManager().fileExistsAtPath(path)
    if exists {
        do {
            try NSFileManager.defaultManager().removeItemAtPath(path)
        }catch let error as NSError {
            print("error: \(error.localizedDescription)")
            return false
        }
    }
    return exists
}

score 3 · Answer 4 · answered Oct 05 '18 at 08:41

For Swift 3.0 -> 4.1:

let fileManager = FileManager()
let fileName = "your_file_name"

//In Order to get your file path correctly
getFileURL(_ fileName: String) -> String? {
    let fileURL = fileManager.urls(for: fileManager.SearchPathDirectory.documentDirectory, in: fileManager.SearchPathDomainMask.userDomainMask).first
    return (fileURL?.appendingPathComponent(fileName).path)
}


//Persist Data
func persistData(_ data : Data) -> Bool{
     return NSKeyedArchiver.archiveRootObject(data, toFile: getFileURL(fileName)!)
}

//Get Persisted Data
func getArchivedData() -> Data?{
    return NSKeyedUnarchiver.unarchiveObject(withFile: getFileURL(fileName)!) as? Data
}

//Delete Persisted Data 
func deleteArchivedUser() -> Bool{
    do {
        try fileManager.removeItem(atPath: getFileURL(fileName)!)
        return true
    } catch _ {
        return false
    }
}

score 2 · Answer 5 · answered Dec 18 '15 at 11:36

2

For Swift 2.0:

do {
  try NSFileManager.defaultManager().removeItemAtPath("Your_PATH")
} catch {

}

answered Dec 18 '15 at 11:36

Phil

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NSKeyedUnarchiver - delete decoded data?

5 Answers5