Swift: UIActivityViewController

Question

通过传递文本，我通过UIActivityViewController共享一个邀请。我能够做到这一点。但我有显示问题，如下图所示。一个灰色的盒子显示在顶部的文本上。下面是我的代码

    let objectToShare = inviteReferrals.inviteData
    let vc = UIActivityViewController(activityItems: [objectToShare], applicationActivities: [])
    present(vc, animated: true)

谁能帮我，为什么这个盒子来了，以及如何避免它。ActivityViewControllerDisplay

Answer 1

let activityViewController = UIActivityViewController(activityItems: [objectToShare], applicationActivities: nil)
activityViewController.popoverPresentationController?.sourceView = self.view
self.present(activityViewController, animated: true, completion: nil)