有没有人知道如何呈现像UIAlertController这样的SelectFooViewController

Question

我想像SelectFooViewController一样提出UIAlertController。

上下文代码将是......

let vc = SelectFooViewController()
self.present(vc, animated: true, completion: nil)

它将弹出一个模态视图，即当前视图的顶部。

Answer 1

您必须设置providesPresentationContextTransitionStyle，definesPresentationContext和modalPresentationStyle

let vc = SelectFooViewController()
vc.providesPresentationContextTransitionStyle = true
vc.definesPresentationContext = true
vc.modalPresentationStyle = .overCurrentContext
self.present(vc, animated: true, completion: nil)

Answer 2

首先你在storyBoard中将视图alpha设置为10以下，你使用哪个控制器并使用以下代码......

let viewController : SelectFooViewController =     self.storyboard!.instantiateViewController(withIdentifier: "Your controller Identifier") as! SelectFooViewController
            viewController.providesPresentationContextTransitionStyle = true;
            viewController.definesPresentationContext = true;
            viewController.modalTransitionStyle = .crossDissolve
            viewController.modalPresentationStyle = .overCurrentContext

            self.present(viewController, animated: true, completion: nil)