ios - 谷歌地图上的透明 UIView - Swift

Question

我试图在谷歌地图上放置一个 UIView 并使这个 UIView 透明以便能够看到背景 map 。如下图所示:

我的代码是:

    @IBOutlet weak var mapViewContainer: UIView!
    var resultsArray = [String]()
    var googleMapsView : GMSMapView!
    var estacionamientoSelecccionado = Estacionamiento()
    @IBOutlet weak var viewTitutlo: UIView!

 override func viewDidLoad() {
    super.viewDidLoad()

    let camera = GMSCameraPosition.camera(withLatitude: (estacionamientoSelecccionado?.latitude)!,
                                          longitude: (estacionamientoSelecccionado?.longitude)!, zoom: 15)
    self.googleMapsView =  GMSMapView.map(withFrame: self.mapViewContainer.frame, camera: camera)
    self.view.addSubview(self.googleMapsView)

    let position = CLLocationCoordinate2D(latitude: (estacionamientoSelecccionado?.latitude)!, longitude: (estacionamientoSelecccionado?.longitude)!)
    let marker = GMSMarker(position: position)
    marker.icon = UIImage(named: "marker_2")!
    marker.map = self.googleMapsView
    self.viewTitutlo.backgroundColor = UIColor.clear
    self.viewTitutlo.isOpaque = false

我将 uiview 设置为 UIColor.clear 的结果是:

我的界面:

Answer 1

您应该在 Storyboard上选择 View 并使用不透明度更改颜色属性

或

customView.backgroundColor = UIColor.white.withAlphaComponent(0.3)