Email CSV using MFMailComposeViewController in swift - ios

Question

I am using this code to export CSV file https://gist.github.com/kenechilearnscode/2d5d35f550f593332319
And it is exporting correctly but I want to email this CSV using MFMailComposeViewController. The above code opens an applicationActivities from where I can choose mail and the file is attached but the subject and recipients are not set. Code I am using to email the CSV is following. Its setting the subject and recipients etc but not attaching the CSV file.
if( MFMailComposeViewController.canSendMail() ) {
print("Can send email.")
let mailComposer = MFMailComposeViewController()
mailComposer.mailComposeDelegate = self
//Set the subject and message of the email
mailComposer.setSubject("Patient Data")
mailComposer.setMessageBody("Please find attached herewith complete patient data", isHTML: false)
mailComposer.setToRecipients(secondaryEmailList)
mailComposer.setCcRecipients([masterEmail])
if let filePath = Bundle.main.path(forResource: "export", ofType: "csv") {
print("File path loaded.")
if let fileData = NSData(contentsOfFile: filePath) {
print("File data loaded.")
mailComposer.addAttachmentData(fileData as Data, mimeType: "text/csv", fileName: "export")
}
}
self.present(mailComposer, animated: true, completion: nil)
}
Here is the code I am using to generate CSV file
func saveAndExport(exportString: String) {
let exportFilePath = NSTemporaryDirectory() + "export.csv"
let exportFileURL = NSURL(fileURLWithPath: exportFilePath)
FileManager.default.createFile(atPath: exportFilePath, contents: NSData() as Data, attributes: nil)
var fileHandleError: NSError? = nil
var fileHandle: FileHandle? = nil
do {
fileHandle = try FileHandle(forWritingTo: exportFileURL as URL)
} catch {
print("Error with fileHandle")
}
if fileHandle != nil {
fileHandle!.seekToEndOfFile()
let csvData = exportString.data(using: String.Encoding.utf8, allowLossyConversion: false)
fileHandle!.write(csvData!)
fileHandle!.closeFile()
let firstActivityItem = NSURL(fileURLWithPath: exportFilePath)
let activityViewController : UIActivityViewController = UIActivityViewController(
activityItems: [firstActivityItem], applicationActivities: nil)
activityViewController.excludedActivityTypes = [
UIActivityType.assignToContact,
UIActivityType.saveToCameraRoll,
UIActivityType.postToFlickr,
UIActivityType.postToVimeo,
UIActivityType.postToTencentWeibo
]
self.present(activityViewController, animated: true, completion: nil)
}
}