Question

我没有在项目中使用StoryBoard。我已经提出了一种视图控制器，称为popOver样式。

let vcOne                               = ViewControllerOne()
    vcOne.showCorrectionFactor          = true
    vcOne.modalPresentationStyle        = .popover
    let pop                             = vcOne.popoverPresentationController
    pop?.sourceView                     = self.view
    pop?.sourceRect                     = sender.frame
    vcOne.preferredContentSize          = CGSize(width: 400, height: 500)
    self.present(vcOne, animated: true, completion: nil)

现在，我想从ViewControllerOne（）导航到其他视图控制器，并在此弹出窗口中。

我这样做

let vc = PairViewController()
self.navigationController?.pushViewController(vc, animated: true)

但是self.navigationController?的价值为零。没有故事板怎么办？

Answer 1

您没有将ViewControllerOne嵌入UINavigationController中，因此self.navigationController当然是nil。

只需执行以下操作：

// embed it!
let navController                   = UINavigationController(rootViewController: vcOne)
// get the popover presentation controller from the navigation controller!
let pop                             = navController.popoverPresentationController
pop?.sourceView                     = self.view
pop?.sourceRect                     = sender.frame
vcOne.preferredContentSize          = CGSize(width: 400, height: 500)
// present navController rather than vcOne!
self.present(navController, animated: true, completion: nil)

从其他ViewController推送到ViewController，显示为弹出框-无故事板

1 个答案: