弹出窗口没有指向按钮

Question

我有一个兼容iPhone和iPad布局的应用程序.对于iPhone布局,我创建了Action Sheet和Pop over iPad.问题是弹出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)

Answer 1

设置sourceView和sourceRect作为button和button.bounds.
您可以根据视图的布局选择allowedArrowDirections.

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;