如何在 iOS 9 swift 中正确显示弹出框 ArrowDirections

Question

我一直在努力找出如何解决这个问题。

这一行popover.permittedArrowDirections = ( .Up | .Down )上面写着"Type of expression is ambiquous without more context."

代码示例如下：

if let popover = alert.popoverPresentationController
        {
        popover.sourceView = imageView
        popover.sourceRect = imageView.bounds
        popover.permittedArrowDirections = ( .Up | .Down )
        }

Answer 1

请使用以下代码：

popover.permittedArrowDirections = [ .Up, .Down ]