如何使Popup ViewController的背景透明？

Question

我有一个ViewController作为弹出窗口，可以在UIDatePicker上选择一个日期。 但是，当此弹出窗口打开时，背景将被新的背景色覆盖。 我尝试选择颜色的不透明度，但这不起作用。 我使用UILabel处理单击并打开一个新的ViewController。

override func viewDidLoad() {
        super.viewDidLoad()

        let tapDateSelectExpiration = UITapGestureRecognizer(target: self, action: #selector(handleSelectDateExpiration))
        let tapDateSelectValidity = UITapGestureRecognizer(target: self, action: #selector(handleSelectDateValidity))
        let tapDateSelectOrder = UITapGestureRecognizer(target: self, action: #selector(handleSelectDateOrder))

        lblDataPedido.isUserInteractionEnabled = true
        lblDataValidade.isUserInteractionEnabled = true
        lblDataExpiracao.isUserInteractionEnabled = true

        lblDataPedido.addGestureRecognizer(tapDateSelectOrder)
        lblDataValidade.addGestureRecognizer(tapDateSelectValidity)
        lblDataExpiracao.addGestureRecognizer(tapDateSelectExpiration)
    }

@objc func handleSelectDateExpiration(_ sender : UILabel) {
        print("handleSelectDateExpiration")
        var vcSelectDate = self.storyboard?.instantiateViewController(withIdentifier: "ViewControllerSelectDate") as! ViewControllerSelectDate
        vcSelectDate.typeDate = "DateExpiration"
        self.present(vcSelectDate,animated: true,completion: nil)
    }

// Other funcs as above.

MainLayout：

带有背景的DatePicker布局不透明：

故事板：

Answer 1

你可以试试

let vc = self.storyboard?.instantiateViewController(withIdentifier: "dateView") as! dateViewController

vc.delegate = self

vc.providesPresentationContextTransitionStyle = true;

vc.definesPresentationContext = true;

vc.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext

self.present(vc, animated: false, completion: nil)

然后选择像这样的透明背景

或在IB