尝试通过点击UIBarButtonItem进行共享时，iPad崩溃

Question

I'm developing an iOS app with Xcode and Swift.

I'm using this code to share a defined string by taping a UIButton :

@IBAction func shareApp(sender: UIButton) {
    let textToShare = "Look at this:"

    if let myWebsite = NSURL(string: "www.example.con") {
        let objectsToShare = [textToShare, myWebsite]
        let activityVC = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)

        if #available(iOS 8.0, *) {
            activityVC.popoverPresentationController?.sourceView = sender
        } else {
            // Fallback on earlier versions
        }
        self.presentViewController(activityVC, animated: true, completion: nil)
    }
}

That works very well on iPhone and iPad.

Now, I want to do the same, but using UIBarButtonItem instead of UIButton . Of cause, This code doesn't work for UIBarButtonItem.

Changing @IBAction func shareApp(sender: AnyObject) { and activityVC.popoverPresentationController?.sourceView = sender as? UIView activityVC.popoverPresentationController?.sourceView = sender as? UIView causes a crash on iPad's as soon as I tap on the BarButtonItem.

Does anybody know how to fix it?

Answer 1

For iPad in addition to source view for popoverPresentationController, you would also need to add sourceRect as well. Try the following:

 if ( UIDevice.currentDevice().userInterfaceIdiom == .Pad) {

     if let fromView = sender as? UIView {
              youActivityVC.popoverPresentationController.sourceView = fromView

    youActivityVC.popoverPresentationController.sourceRect = fromView.frame
}
}