Why my data is not written into the plist file? [duplicate]

Answer 1

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)

Answer 2

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.