在Swift中,我试图从导航栏顶部右侧位置的一个条形按钮显示一个弹出窗口。以下是我的代码:
func showOptions(sender: UIBarButtonItem) {
let optionsVC = OptionsViewController(nibName: "OptionsViewController", bundle: nil)
optionsVC.delegate = self
optionsVC.modalPresentationStyle = .popover
optionsVC.preferredContentSize = CGSize(width: 200, height: 200)
present(optionsVC, animated: true, completion: nil)
let popController = optionsVC.popoverPresentationController
popController?.permittedArrowDirections = .up
popController?.delegate = self
popController?.barButtonItem = sender
}
func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
return .none
}
iPad上运行良好,但在iPhone上却无法正常工作。我已经查阅了文档和不同的网页,一切似乎都是正确的。我的代码缺少什么?