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Writing/reading from file

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I want to find file by name. I can create file but I don't know how to find created when application is running. For example. Application creates "asdf.json" file on the end of running. I want to find "asdf.json" when application starts next time.

   

This is part of code that saves file.

                        let filename1 = getDocumentsDirectory().appendingPathComponent("asdfX.json")
                        let filename2 = getDocumentsDirectory().appendingPathComponent("asdfY.json")

                        do {
                            try STRING1.write(to: filename1, atomically: true, encoding: String.Encoding.utf8)
                        } catch {

                        }

                        do {
                            try STRING2.write(to: filename2, atomically: true, encoding: String.Encoding.utf8)
                        } catch {

                        }

PLEASE HELP ME BRO! YES, YOU!

   

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