iOS: Delete file in .DocumentDirectory using Swift2 - ios

Question

I have a project I'm working on that saves data to a PDF. The code for this is:
// Save PDF Data
let recipeItemName = nameTextField.text
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
pdfData.writeToFile("\(documentsPath)/\(recipeFileName).pdf", atomically: true)
I'm able to view the files in a separate UITableView I have in another ViewController. When the user swipes the UITableViewCell I want it to also delete the item from the .DocumentDirectory. My code for the UITableView delete is:
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
// Delete the row from the data source
savedPDFFiles.removeAtIndex(indexPath.row)
// Delete actual row
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
// Deletion code for deleting from .DocumentDirectory here???
} else if editingStyle == .Insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
I've tried finding the answer online but can't find anything for Swift 2. Can someone please help?
I've tried working with this but with no luck:
var fileManager:NSFileManager = NSFileManager.defaultManager()
var error:NSErrorPointer = NSErrorPointer()
fileManager.removeItemAtPath(filePath, error: error)
I just want to remove the particular item swiped and not all data in the DocumentDirectory.

Answer 1

removeItemAtPath:error: is the Objective-C version. For swift, you want removeItemAtPath, like this:
do {
try NSFileManager.defaultManager().removeItemAtPath(path)
} catch {}
In swift, this is a pretty common pattern when working with methods that will throw - prefix the call with try and enclose in do-catch. You will be doing less with error pointers then you would in objective-c. Instead, the errors need to be caught or, as in the snippet above, ignored. To catch and handle the error, you could do your delete like this:
do {
let fileManager = NSFileManager.defaultManager()
let documentDirectoryURLs = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
if let filePath = documentDirectoryURLs.first?.URLByAppendingPathComponent("myFile.pdf").path {
try fileManager.removeItemAtPath(filePath)
}
} catch let error as NSError {
print("ERROR: \(error)")
}

Answer 2

What you want to do is to retrieve the recipeFileName from the edited cell to reconstruct the file path.
It is unclear as to how you are populating your UITableViewCell data, so I will cover the most common scenario.
Assume you have an array of files that you use to populate the dataSource.
let recipeFiles = [RecipeFile]()
with the RecipeFile struct
struct RecipeFile {
var name: String
}
In tableView(_:cellForRowAtIndexPath:), you probably set the recipeFile like so :
cell.recipeFile = recipeFiles[indexPath.row]
so in tableView(_:commitEditingStyle:forRowAtIndexPath:), you can retrieve the file name like this:
let recipeFile = recipeFiles[indexPath.row]
and delete your file
var fileManager:NSFileManager = NSFileManager.defaultManager()
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let filePath = "\(documentsPath)/\(recipeFile.name).pdf"
do {
fileManager.removeItemAtPath(filePath, error: error)
} catch _ {
//catch any errors
}