在swift 3中分享mp3文件

Question

我想在集合视图单元格中长按时共享MP3文件。我写了下面的代码但它什么也没有返回。我的意思是当我向自己发送电子邮件时。它不包含MP3文件，而且我也看不到WhatsApp部分。

 let r = NSURL(fileURLWithPath: temp_url!)
    //var activityItems: [Any] = [temp_url!]
    let activityViewController = UIActivityViewController(activityItems: [r], applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash

    // exclude some activity types from the list (optional)
     let excludeActivities = [UIActivityType.airDrop, UIActivityType.print, UIActivityType.assignToContact, UIActivityType.saveToCameraRoll, UIActivityType.addToReadingList, UIActivityType.postToFlickr, UIActivityType.postToVimeo, UIActivityType.postToFacebook, UIActivityType.message, UIActivityType.postToWeibo]
    activityViewController.excludedActivityTypes = excludeActivities

    // present the view controller
    self.present(activityViewController, animated: true, completion: nil)


    // exclude some activity types from the list (optional)
    activityViewController.excludedActivityTypes = [ UIActivityType.airDrop, UIActivityType.postToFacebook ]

    // present the view controller
    self.present(activityViewController, animated: true, completion: nil)

Answer 1

我用以下代码解决了这个问题;

if(temp_url != nil){
let activityViewController = UIActivityViewController(activityItems: [temp_url!], applicationActivities: nil)
        activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash

        // exclude some activity types from the list (optional)
         let excludeActivities = [UIActivityType.airDrop, UIActivityType.print, UIActivityType.assignToContact, UIActivityType.saveToCameraRoll, UIActivityType.addToReadingList, UIActivityType.postToFlickr, UIActivityType.postToVimeo, UIActivityType.postToFacebook, UIActivityType.message, UIActivityType.postToWeibo]
        activityViewController.excludedActivityTypes = excludeActivities

        // present the view controller
        self.present(activityViewController, animated: true, completion: nil)
}