Question

使用Google Places API我可以使用此功能在地图中搜索地点并获取相关信息（例如网站），从导航栏navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Search", style: .plain, target: self, action: #selector(pickPlace))中的搜索按钮调用：

func pickPlace() {
let center = CLLocationCoordinate2D(latitude: 40.708637, longitude: -74.014839)
let northEast = CLLocationCoordinate2D(latitude: center.latitude + 0.001, longitude: center.longitude + 0.001)
let southWest = CLLocationCoordinate2D(latitude: center.latitude - 0.001, longitude: center.longitude - 0.001)
let viewport = GMSCoordinateBounds(coordinate: northEast, coordinate: southWest)
let config = GMSPlacePickerConfig(viewport: viewport)
let placePicker = GMSPlacePicker(config: config)

placePicker.pickPlace(callback: {(place, error) -> Void in
    if let error = error {
        print("Pick Place error: \(error.localizedDescription)")
        return
    }

    if let place = place {
        // Set place to class variable selectedPlace
        self.selectedPlace = place
        // Add marker & move camera to new place
        if self.selectedPlace != nil {
            let cam = GMSCameraPosition.camera(withTarget: (self.selectedPlace?.coordinate)!, zoom: 18)
            let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: cam)
            let newPlaceMarker = GMSMarker(position: (self.selectedPlace?.coordinate)!)
            newPlaceMarker.map = mapView
            self.navigationItem.title = self.selectedPlace?.name
            print(self.selectedPlace?.website)
            newPlaceMarker.title = self.selectedPlace?.name
            self.view = mapView
        }

    } else {
        self.navigationItem.title = "No place selected"
    }
})
}

在if let place = place内部我尝试使用var selectedPlace: GMSPlace?将地点设置为名为self.selectedPlace = place的类变量。但是，当我尝试打印时，例如print(self.selectedPlace?.website)，它是零 - 所以我认为我没有正确设置变量，但是我不确定原因。

如何正确地将place从pickPlace函数设置为我的类变量selectedPlace，以便我可以在我的应用中使用它？

编辑：显示我尝试使用

的类变量

我试图将自定义信息窗口显示在用户搜索的标记上，而不仅仅是我的默认标记。这是我的customInfoWindow函数 - 注意＆＃34;默认＆＃34;条件是用户搜索标记时窗口应出现的位置，以及我尝试使用self.selectedPlace?

等name值的地方

func mapView(_ mapView: GMSMapView, markerInfoWindow marker: GMSMarker) -> UIView? {

    let customInfoWindow = Bundle.main.loadNibNamed("CustomInfoWindow", owner: self, options: nil)?[0] as! CustomInfoWindow
    let placeName = marker.title!

    switch placeName {
    case "TGI Friday's":
        customInfoWindow.nameLbl.text = "TGI Friday's"
        customInfoWindow.detailLabel.text = "Thoroughly Average Chain Restaurant"
        customInfoWindow.placeImage.image = UIImage(named: "fridays")
        self.navigationItem.title = "TGI Friday's"
    case "George's":
        customInfoWindow.nameLbl.text = "George's"
        customInfoWindow.detailLabel.text = "Old School Diner"
        customInfoWindow.placeImage.image = UIImage(named: "georges")
        self.navigationItem.title = "George's"
    case "Reserve Cut":
        customInfoWindow.nameLbl.text = "Reserve Cut"
        customInfoWindow.detailLabel.text = "Kosher Steakhouse"
        customInfoWindow.placeImage.image = UIImage(named: "reserveCut")
        self.navigationItem.title = "Reserve Cut"
    case "O'Hara's":
        customInfoWindow.nameLbl.text = "O'Hara's"
        customInfoWindow.detailLabel.text = "Irish Pub"
        customInfoWindow.placeImage.image = UIImage(named: "oharas")
        self.navigationItem.title = "O'Hara's"
    case "Bill's Bar & Burger":
        customInfoWindow.nameLbl.text = "Bill's Bar & Burger"
        customInfoWindow.detailLabel.text = "Bar founded by Bill that also has burgers"
        customInfoWindow.placeImage.image = UIImage(named: "bills")
        self.navigationItem.title = "Bill's Bar & Burger"
    default:
        customInfoWindow.nameLbl.text = self.selectedPlace?.name
        customInfoWindow.placeImage.image = UIImage(named: "noImage")
        self.navigationItem.title = self.selectedPlace?.name
    }

    return customInfoWindow
}

然后，当我显示信息窗口后，我想点击它并被带到网站 - 再次，默认条件是我尝试使用{{1} }值：

self.selectedPlace?

Answer 1

您的问题是您在回调闭包中创建了一个新的地图视图，而不是将该地点添加到现有的地图视图中。这个新的地图视图缺少所有原始位置，并且它的委托没有设置到您的视图控制器实例，因此不会调用委托方法。

创建地图视图时，应将其存储在实例属性中，并将新位置添加到该地图视图中：

 if self.selectedPlace != nil {
     let cam = GMSCameraPosition.camera(withTarget: (self.selectedPlace?.coordinate)!, zoom: 18)
     let newPlaceMarker = GMSMarker(position: (self.selectedPlace?.coordinate)!)
     newPlaceMarker.map = self.mapView
     self.mapView.camera = cam

     self.navigationItem.title = self.selectedPlace?.name
     print(self.selectedPlace?.website)
     newPlaceMarker.title = self.selectedPlace?.name
}

将数据设置为类变量（来自Google Places API）

1 个答案: