Why my data is not written into the plist file?

Question

I was trying to make a module using Swift that can add a class to the database(ClassA.plist). The code is like this:

class AddClass:UITableViewController {
@IBOutlet weak var txtClassName: UITextField!


@IBAction func Save(_ sender: Any) {
    let plistPath = Bundle.main.path(forResource: "ClassA", ofType:"plist")
    let array = NSMutableArray(contentsOfFile: plistPath!)
    let AddData = NSDictionary(object: txtClassName.text!, forKey: "name" as NSCopying)

    array?.add(AddData)

    array?.write(toFile: plistPath!, atomically: false)
    DispatchQueue.main.async {
        super.tableView.reloadData()
    }
}

And my storyboard is like this:

Storyboard Save Button

However, as I write something in the textfield and click Save, nothing changed in my database. No waring, error or logs is shown.Does anyone know how to solve this problem?

Use this answer if it makes sense.http://stackoverflow.com/questions/6697247/how-to-create-plist-files-programmatically-in-iphone — Manish Singh, Dec 05 '16 at 22:08
As has been written in so many other posts, an app's bundle is readonly. — rmaddy, Dec 05 '16 at 22:18

score 1 · Accepted Answer · answered Dec 05 '16 at 23:03

1

You can't write to a file in the app bundle. The app bundle is read-only. You will need to copy your file to one of your sandbox directories like the documents directory before you will be able to change it.

answered Dec 05 '16 at 23:03

Duncan C

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There are many duplicates this could be closed as but I couldn't find any in Swift. – rmaddy Dec 05 '16 at 23:12
And now thanks to Christian, this thread can be the Swift answer to this perennial question... – Duncan C Dec 05 '16 at 23:40
Actually, I finally found one - and it's your answer. – rmaddy Dec 05 '16 at 23:43
Thanks a lot. I am sorry that I did not know that this is a duplicate question. – David Dec 06 '16 at 00:33
@rmaddy, Christian's answer covers copying the file from the bundle to the documents directory before modifying it, which is a useful twist on the problem. – Duncan C Dec 06 '16 at 00:36

Christian Abella · Answer 2 · 2016-12-05T23:41:38.300

As many have pointed out, the app's bundle is read-only. What you can do is copy the file if you really want to use it and put it in the documentDirectory where you can read and write to it.

let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let plistPath = paths.appending("/data.plist")
let fileManager = FileManager.default

if !fileManager.fileExists(atPath: plistPath)
{
  // Default plist name is Info. Just using ClassA
  let bundle = Bundle.main.path(forResource: "ClassA", ofType: "plist")
  try! fileManager.copyItem(atPath: bundle!, toPath: plistPath)
}


let data = NSMutableDictionary(contentsOfFile: plistPath)

data?.setObject("Hello World", forKey: "name" as NSCopying)
data?.write(toFile: plistPath, atomically: true)

print(data)

Why my data is not written into the plist file?

2 Answers2