如何制作Popup ViewController的透明背景？

Question

我有一个ViewController作为弹出窗口来选择UIDatePicker上的日期。但是，当这个弹出窗口打开时，背景会被新的背景颜色覆盖。我尝试选择不透明的颜色，但这不起作用。 我使用UILabel来处理点击并打开一个新的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：

背景不透明的DatePicker布局：

故事板：

Answer 1

你可以尝试

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)

并选择像这样的透明背景

或在IB