如何在iPhone中使用Popover控制器

将自己设置为Popover视图控制器的委托 之前 演示它,并实现委托方法 adaptivePresentationStyle(for:traitCollection:) 返回 .none . 这将导致Popover不再适应iPhone作为全屏显示的视图控制器,并像在iPad上一样变成实际的Popover。

这是一个完整的工作示例,显示了响应按钮点击的弹出窗口:

class ViewController: UIViewController {
    @IBAction func doButton(_ sender: Any) {
        let vc = MyPopoverViewController()
        vc.preferredContentSize = CGSize(400,500)
        vc.modalPresentationStyle = .popover
        if let pres = vc.presentationController {
            pres.delegate = self
        }
        self.present(vc, animated: true)
        if let pop = vc.popoverPresentationController {
            pop.sourceView = (sender as! UIView)
            pop.sourceRect = (sender as! UIView).bounds
        }
    }
}
extension ViewController : UIPopoverPresentationControllerDelegate {
    func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
        return .none
    }
}