swift UIAlertController以iPad为中心

Posted 2021-05-19

    UIPopoverPresentationController *popPresenter = ac.popoverPresentationController;
    popPresenter.sourceView = self.view;
    popPresenter.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds),0,0);
    popPresenter.permittedArrowDirections = 0;

let popPresenter = ac.popoverPresentationController
popPresenter?.sourceView = view
popPresenter?.sourceRect = CGRect(x: view.bounds.midX, y: view.bounds.midY, width: 0, height: 0)
popPresenter?.permittedArrowDirections = []