单击选项后弹出位置不正确

Question

从我的水龙头（斯威夫特）的弹出位置

我怎样才能这样做，当我点击链接时，弹出窗口会出现在图片中所示的点击旁边？

---

我试图添加它，但它显示在左上角

optionMenu.popoverPresentationController?.sourceView = self.view

func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
    if (URL.scheme?.contains("mailto"))! {
        let optionMenu = UIAlertController(title: nil, message: "\(URL)", preferredStyle: .actionSheet)
        // 2
        let NewAction = UIAlertAction(title: "New Mail Message", style: .default, handler: { (alert: UIAlertAction!) -> Void in
            print("New Mail Message")
            UIApplication.shared.open(URL)
        })
        //
        let CopyAction = UIAlertAction(title: "Copy", style: .default, handler: { (alert: UIAlertAction!) -> Void in
            print("Copy Email")
            UIPasteboard.general.string = "\(URL)"
        })
        //
        let CancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: { (alert: UIAlertAction!) -> Void in
            print("Cancelled")
        })
        // 4
        optionMenu.addAction(NewAction)
        optionMenu.addAction(CopyAction)
        optionMenu.addAction(CancelAction)
        // 5
        self.present(optionMenu, animated: true) {
            print("Email menu presented")
        }
    } else {
    //
    }
}

Answer 1

你几乎完成了工作。您需要的是检测链接在屏幕上的位置并在那里显示警报。

presentationController的预设置：

//You may also consider allowing UIPopoverArrowDirection.up.down if it suits your case.
optionMenu.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.up
optionMenu.popoverPresentationController?.sourceView = textView

如何找到链接的位置：

guard let beginning = textView.position(from: textView.beginningOfDocument, offset: characterRange.location),
        let end = textView.position(from: textView.beginningOfDocument, offset: characterRange.location + characterRange.length),
        let textRange = textView.textRange(from: beginning, to: end) else {
            //Cannot locate link
            return false
    }

//move the presentationController to point to the link
optionMenu.popoverPresentationController?.sourceRect = textView.firstRect(for: textRange)

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