单击时将GMSMarker放在底部

import GoogleMaps

class ViewController: UIViewController, GMSMapViewDelegate {
    var mapView: GMSMapView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建地图视图
        let camera = GMSCameraPosition.camera(withLatitude: 37.7749, longitude: -122.4194, zoom: 12.0)
        mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
        mapView.delegate = self
        self.view = mapView
        
        // 创建标记
        let marker = GMSMarker()
        marker.position = CLLocationCoordinate2D(latitude: 37.7749, longitude: -122.4194)
        marker.title = "San Francisco"
        marker.snippet = "California, USA"
        marker.map = mapView
    }
    
    func mapView(_ mapView: GMSMapView, didTap marker: GMSMarker) -> Bool {
        // 移动地图视图的cameraPosition到标记的位置
        mapView.camera = GMSCameraPosition.camera(withTarget: marker.position, zoom: mapView.camera.zoom)
        
        // 创建自定义的InfoWindow视图
        let infoWindow = CustomInfoWindow(frame: CGRect(x: 0, y: mapView.frame.size.height - 100, width: mapView.frame.size.width, height: 100))
        infoWindow.titleLabel.text = marker.title
        infoWindow.descriptionLabel.text = marker.snippet
        
        // 添加自定义的InfoWindow视图到地图视图的底部位置
        mapView.addSubview(infoWindow)
        
        return true
    }
}

class CustomInfoWindow: UIView {
    var titleLabel: UILabel!
    var descriptionLabel: UILabel!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // 创建标题标签
        titleLabel = UILabel(frame: CGRect(x: 10, y: 10, width: frame.size.width - 20, height: 20))
        titleLabel.font = UIFont.boldSystemFont(ofSize: 16)
        self.addSubview(titleLabel)
        
        // 创建描述标签
        descriptionLabel = UILabel(frame: CGRect(x: 10, y: 30, width: frame.size.width - 20, height: 60))
        descriptionLabel.numberOfLines = 0
        descriptionLabel.font = UIFont.systemFont(ofSize: 14)
        self.addSubview(descriptionLabel)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}