弹出框没有指向按钮

Question

我有一个应用程序，适用于iPhone和iPad的布局。对于iPhone布局，我创建了操作表和Pop Over，而对于iPad，则是 Pop Over。问题在于 Pop Over 的箭头没有指向我点击的按钮。以下是我的代码....

let actionSheet = UIAlertController(title: "Choose an option",
            message: "Message",
            preferredStyle: .ActionSheet)
...

if UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad
{
     // for iPad
     actionSheet.popoverPresentationController?.sourceView = self.view
     actionSheet.popoverPresentationController?.sourceRect = self.view.bounds;
     actionSheet.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.allZeros;
}

self.presentViewController(actionSheet, animated: true, completion: nil)

- Srujan Simha

Answer 1

将sourceView和sourceRect设置为button和button.bounds。
根据您的视图布局可以选择允许的permittedArrowDirections。

actionSheet.popoverPresentationController?.sourceView = button
actionSheet.popoverPresentationController?.sourceRect = button.bounds;
actionSheet.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.Left;

如果按钮是一个BarButtonItem，请使用此代码。

actionSheet.popoverPresentationController?.barButtonItem = button
actionSheet.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.Up;

- rakeshbs

---

好的，那也不行。按钮实际上是一个UIBarButtonItem。我已经将函数更改为@IBAction func userOptions(button: UIBarButtonItem)，但它抛出了一个错误：[UIBarButtonItem bounds]: unrecognized selector sent。 - Srujan Simha

请检查我修改后的答案 @SrujanSimha - rakeshbs

sourceView和sourceRect有什么区别？ - Paweł Brewczynski

使用 bounds 而不是 frame 是我正在寻找的。谢谢！ - Beltalowda

Answer 2

对我来说，使用发送者并将其转换为UIView是有效的。

alertController.popoverPresentationController?.sourceView = sender as! UIView
alertController.popoverPresentationController?.sourceRect = sender.bounds

alertController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.Up

- Javier Gomez

Answer 3

SWIFT 3

当我的按钮是UIBarButtonItem时，这段代码对我起作用：

if UIDevice.current.userInterfaceIdiom == .pad {

    if controller.responds(to: "popoverPresentationController") {
        controller.popoverPresentationController?.barButtonItem = YourUIBarButtonName
    }

}

Entire code snippet below:

func presentActivitySheet() {

    let controller = UIActivityViewController(activityItems: [document.fileURL], applicationActivities: nil)

        if UIDevice.current.userInterfaceIdiom == .pad {

            if controller.responds(to: "popoverPresentationController") {
            controller.popoverPresentationController?.barButtonItem = YourUIBarButtonName
            }

        }

    present(controller, animated: true, completion: nil)
}

- A.J. Hernandez