ios - 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，我为 iPad 创建了 Action Sheet 和 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

将sourceView 和sourceRect 设置为button 和button.bounds。
您可以根据 View 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 使用此代码。

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