如何在IOS中将UIBarButtonItem设置为弹出窗口的锚点？

Question

我在我的iPad应用程序中显示一个弹出控制器:

[self.programMapPopOver presentPopoverFromRect:anchor.frame
                        inView:anchor.superview
                        permittedArrowDirections:UIPopoverArrowDirectionAny 
                        animated:YES];

我的问题是锚:我想设置一个UIBarButtonItem*作为它的锚点,但它不是UIView*,但是inView是一个view*参数.

我怎么解决这个问题？

谢谢大家!

Answer 1

在iOS 8和9中,presentPopoverFromBarButtonItem:permittedArrowDirections:animated:不推荐使用该方法.您需要barButtonItem在视图控制器的popoverPresentationController属性上设置该属性.

let popover = UIViewController()
popover.modalPresentationStyle = .Popover
if let presentation = popover.popoverPresentationController {
    presentation.barButtonItem = navigationItem.rightBarButtonItem
}
presentViewController(popover, animated: true, completion: nil)

Answer 2

你需要使用presentPopoverFromBarButtonItem:permittedArrowDirections:animated:.