弹出不指向按钮

Question

我有一个与 iPhone 和 iPad 布局兼容的应用程序。对于 iPhone 布局，我创建了 Action Sheet 并为 iPad 创建了 Pop over。问题是弹出箭头没有指向我单击的按钮。下面是我的代码....

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)

Answer 1

设置sourceView和sourceRect为button和button.bounds。
您可以根据视图的布局选择 permittedArrowDirections。

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

如果按钮是 BarButtonItem，请使用此代码。

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

Answer 2

对我来说，使用发件人并投射为 UIView。

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

alertController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.Up

Answer 3

SWIFT 3

当我的按钮是 UIBarButtonItem 时，这对我有用：

if UIDevice.current.userInterfaceIdiom == .pad {

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

}

下面的完整代码片段：

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)
}

弹出不指向按钮

Pop over doesn't point over the button

ios

ipad

swift

popover