.NET MAUI Map控件加载及MoveToRegion方法异常求助

• 点击按钮才显示的地图区域，使用Microsoft.Maui.Controls.Maps实现谷歌地图时，调用MoveToRegion(MapSpan)方法失效，地图默认以(0, 0)为中心显示
• 临时将区域隐藏、点击时再设为实际大小的方案，会触发不必要的Google Maps API调用，增加服务成本
• 已设置过中心后再次调用MoveToRegion，地图仍无法移动

• .NET 7
• Microsoft.Maui.Controls.Maps 7.0.101
• 采用MVVM模式，地图通过自定义控件实现，关联属性变更时执行MoveToRegion操作，已确认传入坐标与当前显示中心不同，推测问题与MVVM模式下地图加载延迟有关

自定义控件XAML #

<maps:Map x:Name="Map"
          IsScrollEnabled="{Binding IsScrollEnabled}"
          IsShowingUser="{Binding IsShowingUser}"
          IsTrafficEnabled="{Binding IsTrafficEnabled}"
          IsZoomEnabled="{Binding IsZoomEnabled}"
          ItemsSource="{Binding Pins}">
    <maps:Map.ItemTemplate>
        <DataTemplate x:DataType="viewModels:MapPinViewModel">
            <maps:Pin Address="{Binding Address}"
                      Label="{Binding Title}"
                      Location="{Binding Location}" />
        </DataTemplate>
    </maps:Map.ItemTemplate>
</maps:Map>

自定义控件后台代码 #

using System.Collections.Generic;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Maui.Controls;
using Microsoft.Maui.Devices.Sensors;
using Microsoft.Maui.Maps;
using xxx.ViewModels;
using static Microsoft.Maui.Controls.BindableProperty;

namespace xxx
{
    public partial class MapView : ContentView
    {
        public static readonly BindableProperty AddressLabelProperty = Create(nameof(AddressLabel), typeof(string), typeof(MapView));
        public static readonly BindableProperty CenterProperty = Create(nameof(Center), typeof(Location), typeof(MapView));
        public static readonly BindableProperty DesiredHeightProperty = Create(nameof(DesiredHeight), typeof(double), typeof(MapView), 350D);
        public static readonly BindableProperty GoToAddressListCommandProperty = Create(nameof(GoToAddressListCommand), typeof(IRelayCommand), typeof(MapView));
        public static readonly BindableProperty IsScrollEnabledProperty = Create(nameof(IsScrollEnabled), typeof(bool), typeof(MapView), false);
        public static readonly BindableProperty IsShowingUserProperty = Create(nameof(IsShowingUserProperty), typeof(bool), typeof(MapView), false);
        public static readonly BindableProperty IsTrafficEnabledProperty = Create(nameof(IsTrafficEnabled), typeof(bool), typeof(MapView), false);
        public static readonly BindableProperty IsZoomEnabledProperty = Create(nameof(IsZoomEnabled), typeof(bool), typeof(MapView), false);
        public static readonly BindableProperty PinsProperty = Create(nameof(Pins), typeof(IEnumerable<MapPinViewModel>), typeof(MapView));
        public new static readonly BindableProperty IsVisibleProperty = Create(nameof(IsVisible), typeof(bool), typeof(MapView), false, propertyChanged: OnIsVisibleChanged);

        public string AddressLabel
        {
            get
            {
                return (string)this.GetValue(AddressLabelProperty);
            }
            set
            {
                this.SetValue(AddressLabelProperty, value);
            }
        }

        public Location Center
        {
            get
            {
                return (Location)this.GetValue(CenterProperty);
            }
            set
            {
                this.SetValue(CenterProperty, value);
            }
        }

        public double DesiredHeight
        {
            get
            {
                return (double)this.GetValue(DesiredHeightProperty);
            }
            set
            {
                this.SetValue(DesiredHeightProperty, value);
            }
        }

        public IRelayCommand GoToAddressListCommand
        {
            get
            {
                return (IRelayCommand)this.GetValue(GoToAddressListCommandProperty);
            }
            set
            {
                this.SetValue(GoToAddressListCommandProperty, value);
            }
        }

        public bool IsScrollEnabled
        {
            get
            {
                return (bool)this.GetValue(IsScrollEnabledProperty);
            }
            set
            {
                this.SetValue(IsScrollEnabledProperty, value);
            }
        }

        public bool IsShowingUser
        {
            get
            {
                return (bool)this.GetValue(IsShowingUserProperty);
            }
            set
            {
                this.SetValue(IsShowingUserProperty, value);
            }
        }

        public bool IsTrafficEnabled
        {
            get
            {
                return (bool)this.GetValue(IsTrafficEnabledProperty);
            }
            set
            {
                this.SetValue(IsTrafficEnabledProperty, value);
            }
        }

        public new bool IsVisible
        {
            get
            {
                return (bool)this.GetValue(IsVisibleProperty);
            }
            set
            {
                this.SetValue(IsVisibleProperty, value);
            }
        }

        public bool IsZoomEnabled
        {
            get
            {
                return (bool)this.GetValue(IsZoomEnabledProperty);
            }
            set
            {
                this.SetValue(IsZoomEnabledProperty, value);
            }
        }

        public IEnumerable<MapPinViewModel> Pins
        {
            get
            {
                return (IEnumerable<MapPinViewModel>)this.GetValue(PinsProperty);
            }
            set
            {
                this.SetValue(PinsProperty, value);
            }
        }

        public MapView()
        {
            this.InitializeComponent();
        }

        private static void OnIsVisibleChanged(BindableObject bindable, object oldValue, object newValue)
        {
            MapView mapView = bindable as MapView;
            if (mapView == null)
                return;

            bool? isVisible = newValue as bool?;
            if (!isVisible.HasValue)
                return;

            if (isVisible.Value)
            {
                mapView.Grid.HeightRequest = mapView.DesiredHeight;

                if (mapView.Center != null)
                {
                    MapSpan mapSpan = MapSpan.FromCenterAndRadius(new Location(mapView.Center.Latitude, mapView.Center.Longitude), new Distance(500));

                    mapView.Map.MoveToRegion(mapSpan);
                }
            }
            else
                mapView.Grid.HeightRequest = 1D;
        }
    }
}

内容的提问来源于stack exchange，提问作者Gabriele Zanatta