ios - 通过 UIActivityViewController 共享 csv 文件

Question

我正在尝试使用 UIActivityViewController 共享一个 csv 文件。
我想通过电子邮件和其他应用程序(例如 Telegram)共享。
通过 Telegram 可以正确共享文件，但使用电子邮件时，电子邮件没有附件。
另外，csv 文件没有扩展名，我应该设置 MIME 类型吗？怎么办？

 @IBAction func shareSheet(sender: AnyObject) {

    let firstActivityItem = "Hi, here is the csv file"

    //do i really need this? what for?
    let secondActivityItem : NSURL = NSURL(string: "http//:urlyouwant")!

    let csv : NSData! = NSData(contentsOfFile: NSTemporaryDirectory() + "export.csv")

    let activityViewController : UIActivityViewController = UIActivityViewController(
        activityItems: [firstActivityItem, secondActivityItem, csv], applicationActivities: nil)

    //set the email title
    activityViewController.setValue(firstAcxtivityItem, forKey: "subject")


    self.presentViewController(activityViewController, animated: true, completion: nil)
}

Answer 1

这是我用来通过邮件编辑器发送 CSV 的代码

let csvString = "Your CSV String"
    let subject = "Subject of your email"
    let fileName = "CSV Filename.csv"

    let composeVC = MFMailComposeViewController()
    composeVC.mailComposeDelegate = self
    composeVC.setSubject(subject)

    if let csvData = csvString.data(using: String.Encoding.utf8) {
        composeVC.addAttachmentData(csvData, mimeType: "text/csv", fileName: fileName)
    }

    self.present(composeVC, animated: true, completion: nil)