Add Share Button to iOS 9 App

@IBAction func export(sender: UIBarButtonItem) {        
    if let data = prepareCSVData() {
        let filename = getDocumentsDirectory().stringByAppendingPathComponent("data.csv")
        
        data.writeToFile(filename, atomically: true)
        
        let url = NSURL(fileURLWithPath: filename)
        
        let activityViewController = UIActivityViewController(activityItems: [url], applicationActivities: nil)
        
        if let popoverController = activityViewController.popoverPresentationController {
            popoverController.barButtonItem = sender
        }

        presentViewController(activityViewController, animated: true, completion: nil)

    } else {
        NSLog("Unable to prepare data")
    }
}

The important line is where you set up the popoverController. Without that, it will crash on iPad.

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