How to Read .txt File in C Xcode

How to create a file, write data into it and read data from it on iOS?

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Existence a software developer nosotros should be always aware of how to play with files, write to a file, read from the file then on.

In this mail we are going to learn the same, nosotros will be creating a file and writing the information to the file and subsequently reading through the same file.

So let'due south get started,

Step one − Create new Xcode Project → Single View Application → name information technology "ReadingWritingFile"

Pace 2 − Open up ViewController.swift and add new function equally testify below

public func createAndWriteFile() { }

Now nosotros will create a file and will print the path of the file.

Footstep 3 − Inside createAndWriteFile function add together

permit fileName = "sample" permit documentDirectoryUrl = try! FileManager.default.url(    for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true ) let fileUrl = documentDirectoryUrl.appendingPathComponent(fileName).appendingPathExtension("txt") // prints the file path impress("File path \(fileUrl.path)")

At present your createAndWriteFile function should look like below one

public func createAndWriteFile() {    let fileName = "sample"    let documentDirectoryUrl = try! FileManager.default.url(       for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true    )    permit fileUrl = documentDirectoryUrl.appendingPathComponent(fileName).appendingPathExtension("txt")    // prints the file path    print("File path \(fileUrl.path)")    //information to write in file.    permit stringData = "Hi Tutorials Indicate"    do {       attempt stringData.write(to: fileUrl, atomically: true, encoding: String.Encoding.utf8)    } take hold of permit error equally NSError {       print (fault)    } }

Now nosotros will be writing to the file.

Add together below code to the existing function

//data to write in file. let stringData = "Hello Tutorials Point" do {    try stringData.write(to: fileUrl, atomically: true, encoding: String.Encoding.utf8) } catch let error equally NSError {    print (error) }

Step 4 − Your terminal function should await like below

// function to create file and write into the aforementioned. public func createAndWriteFile() {    let fileName = "sample"    let documentDirectoryUrl = effort! FileManager.default.url(       for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true    )    let fileUrl = documentDirectoryUrl.appendingPathComponent(fileName).appendingPathExtension("txt")    // prints the file path    print("File path \(fileUrl.path)")    //data to write in file.    let stringData = "Howdy Tutorials Signal"    do {       try stringData.write(to: fileUrl, atomically: true, encoding: Cord.Encoding.utf8)    } take hold of let error as NSError {       print (error)    } }

Step 5 − Run the project by calling the new method from viewDidLoad() and navigate the file path and validate the content.

Step 6 − Now we're going to read the content, copy the below code in the same part

var readFile = "" do {    readFile = try String(contentsOf: fileUrl) } grab allow error as NSError {    print(mistake) } print (readFile)

And you're done,

Step 7 − Complete code,

import UIKit form ViewController: UIViewController {    override func viewDidLoad() {       super.viewDidLoad()       // Do any additional setup later loading the view, typically from a nib.       self.createReadAndWriteFile()    }    override func didReceiveMemoryWarning() {       super.didReceiveMemoryWarning()       // Dispose of any resources that tin be recreated.    }    // role to create file and write into the same.    public func createReadAndWriteFile() {       let fileName = "sample"       let documentDirectoryUrl = try! FileManager.default.url(          for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: truthful          )       allow fileUrl = documentDirectoryUrl.appendingPathComponent(fileName).appendingPathExtension("txt")       // prints the file path       print("File path \(fileUrl.path)")       //data to write in file.       let stringData = "Hello Tutorials Signal."       practise {          try stringData.write(to: fileUrl, atomically: truthful, encoding: String.Encoding.utf8)       } catch let error as NSError {          impress (mistake)       }       var readFile = ""       do {          readFile = effort String(contentsOf: fileUrl)       } catch permit error every bit NSError {          print(error)       }       print (readFile)    } }

Published on 16-Dec-2019 12:21:25

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Source: https://www.tutorialspoint.com/how-to-create-a-file-write-data-into-it-and-read-data-from-it-on-ios

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