How do i exactly export a csv file from iOS written in swift? - ios

Question

I am trying to export an cvs file.
With the following code i manage to get the file
let fileName = "sample.csv"//"sample.txt"
#IBAction func createFile(sender: AnyObject) {
let path = tmpDir.stringByAppendingPathComponent(fileName)
let contentsOfFile = "No,President Name,Wikipedia URL,Took office,Left office,Party,Home State\n1,George Washington,http://en.wikipedia.org/wiki/George_Washington,30/04/1789,4/03/1797,Independent,Virginia\n2,John Adams,http://en.wikipedia.org/wiki/John_Adams,4/03/1797,4/03/1801,Federalist,Massachusetts\n3,Thomas Jefferson,http://en.wikipedia.org/wiki/Thomas_Jefferson,4/03/1801,4/03/1809,Democratic-Republican,Virginia\n4,James Madison,http://en.wikipedia.org/wiki/James_Madison,4/03/1809,4/03/1817,Democratic-Republican,Virginia\n5,James Monroe,http://en.wikipedia.org/wiki/James_Monroe,4/03/1817,4/03/1825,Democratic-Republican,Virginia\n6,John Quincy Adams,http://en.wikipedia.org/wiki/John_Quincy_Adams,4/03/1825,4/03/1829,Democratic-Republican/National Republican,Massachusetts"
//"Sample Text repacement for future cvs data"content to save
// Write File
do {
try contentsOfFile.writeToFile(path, atomically: true, encoding: NSUTF8StringEncoding)
print("File sample.txt created at tmp directory")
} catch {
print("Failed to create file")
print("\(error)")
}
}
// Share button
#IBAction func shareDoc(sender: AnyObject) {
print("test share file")
docController.UTI = "public.comma-separated-values-text"
docController.delegate = self//delegate
docController.name = "Export Data"
docController.presentOptionsMenuFromBarButtonItem(sender as! UIBarButtonItem, animated: true)
//}
}
When i click the share file button in the simulator i see the following:
and with quick look it shows
So the next thing i did was testing with my iphone 5 and i tried to email sample.csv but i am only getting the message body and not the csv file???
how can i actually email the .csv file?
which export possibilities are there?

Answer 1

In order to email the .csv file, you can do the following:
Add this import to the top of the class. It allows you to use MFMailComposeViewController, which is a way to send emails.
import MessageUI
Generate your data, a sample I have done is:
// Creating a string.
var mailString = NSMutableString()
mailString.appendString("Column A, Column B\n")
mailString.appendString("Row 1 Column A, Row 1 Column B\n")
mailString.appendString("Row 2 Column A, Row 2 Column B\n")
// Converting it to NSData.
let data = mailString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
// Unwrapping the optional.
if let content = data {
print("NSData: \(content)")
}
Generate the MFMailComposeViewController
// Generating the email controller.
func configuredMailComposeViewController() -> MFMailComposeViewController {
let emailController = MFMailComposeViewController()
emailController.mailComposeDelegate = self
emailController.setSubject("CSV File")
emailController.setMessageBody("", isHTML: false)
// Attaching the .CSV file to the email.
emailController.addAttachmentData(data!, mimeType: "text/csv", fileName: "Sample.csv")
return emailController
}
// If the view controller can send the email.
// This will show an email-style popup that allows you to enter
// Who to send the email to, the subject, the cc's and the message.
// As the .CSV is already attached, you can simply add an email
// and press send.
let emailViewController = configuredMailComposeViewController()
if MFMailComposeViewController.canSendMail() {
self.presentViewController(emailViewController, animated: true, completion: nil)
}
In your case, as you have already created the file, you can simply attach that directly by changing the line where the CSV is attached to the mail for:
emailController.addAttachmentData(NSData(contentsOfFile: "YourFile")!, mimeType: "text/csv", fileName: "Sample.csv")
Answer based on: Attach csv to email xcode ,
Create CSV file in Swift and write to file

Answer 2

Creating CSV file in Swift
class ViewController: UIViewController {
var taskArr = [Task]()
var task: Task!
override func viewDidLoad() {
super.viewDidLoad()
task = Task()
for _ in 0..<5 {
task.name = "Raj"
task.date = "\(Date())"
task.startTime = "Start \(Date())"
task.endTime = "End \(Date())"
taskArr.append(task!)
}
creatCSV()
}
// MARK: CSV file creating
func creatCSV() -> Void {
let fileName = "Tasks.csv"
let path = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(fileName)
var csvText = "Date,Task Name,Time Started,Time Ended\n"
for task in taskArr {
let newLine = "\(task.date),\(task.name),\(task.startTime),\(task.endTime)\n"
csvText.append(newLine)
}
do {
try csvText.write(to: path!, atomically: true, encoding: String.Encoding.utf8)
} catch {
print("Failed to create file")
print("\(error)")
}
print(path ?? "not found")
}
}
Task Model class
class Task: NSObject {
var date: String = ""
var name: String = ""
var startTime: String = ""
var endTime: String = ""
}
CSV output show as below format

Answer 3

SWIFT 5
func creatCSV() {
let fileName = "exportar_serv.csv"
/* CREAR UN ARCHIVO NUEVO EN EL DIRECTORIO PRINCIPAL */
guard let path = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent(fileName) as NSURL else {
return }
var csvText = "id,name,imageName\n"
for task in taskArr {
let x : Int64 = task.id!
let id2 = String(x)
let newLine = "\(id2),\(task.name),\(task.imageName)\n"
csvText.append(newLine)
} // for
do {
try csvText.write(to: path as URL, atomically: true, encoding: String.Encoding.utf8)
print("DATOS GUARDADOS")
} catch {
print("Failed to create file")
print("\(error)")
} // catch
} // CreateCSV

Answer 4

Swift 5.0.1, Xcode 10.2.1 version
private func injectExportButton() {
var csvIcon: UIImage
switch self.theme {
case .dark:
csvIcon = UIImage(named: "csv-export.dark", in: Bundle.framework)!
case .light:
csvIcon = UIImage(named: "csv-export.light", in: Bundle.framework)!
}
let imgWidth = csvIcon.size.width
let imgHeight = csvIcon.size.height
let button: UIButton = UIButton(frame: CGRect(x: 0, y: 0, width: imgWidth, height: imgHeight))
button.setBackgroundImage(csvIcon, for: UIControl.State())
button.alpha = 0
button.addTarget(self, action: #selector(csvExportButtonClicked), for: .touchUpInside)
UIView.animate(withDuration: 0.5) {
button.alpha = 1
}
navigationItem.rightBarButtonItem = UIBarButtonItem(customView: button)
}
#objc private func csvExportButtonClicked() {
debugPrint("export clicked")
createCSV()
}
private func createCSV() -> Void {
let fileName = getDocumentsDirectory().appendingPathComponent("OutputD.csv")
var csvOutputText = "Result, Date, Name\n"
history.results.forEach { result in
let newLine = "\(String(describing: result.value)),\(String(describing: result.date)),\(String(describing: result.name))\n"
csvOutputText.append(newLine)
}
do {
try csvOutputText.write(to: fileName, atomically: true, encoding: String.Encoding.utf8)
} catch {
print("Failed to create file")
print("\(error)")
}
let activity = UIActivityViewController(activityItems: ["your results", fileName], applicationActivities: nil)
present(activity, animated: true)
}
private func getDocumentsDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
return paths[0]
}