当通过后面的代码向UI添加地图时，应用程序冻结一秒钟

Question

我正在从一个页面导航到另一页（Xamarin形式的Android设备），我在某些操作后向UI添加了一个地图，并且在将映射添加到UI时，我可以觉得UI是UI是闪烁一秒钟。我们如何在不影响应用程序的性能的情况下正确添加新视图

public Constructor(string _jobOrderId, JobOrder jobOrderDetails)
        {
            InitializeComponent();
            NavigationPage.SetHasNavigationBar(this, false);
            vm = new OrderAssignmentDetailsVM();
            this.BindingContext = vm;
        }

protected override void OnAppearing()
        {
            base.OnAppearing();
            ClickEvent();
            SetUiElements();
            GoogleMapData();
            SetMaptoUI();
            List.ItemsSource = vm.OrderStatusList;
        }

向UI添加地图

     private void SetMaptoUI()
            {
                //add map to UI
                mapHolder.Children.Add(map);
                mapHolder.Children.Add(new Image() { Source = "redpin.png", HeightRequest = 50, WidthRequest = 33, Margin = Device.OnPlatform(new Thickness(0, 0, 0, 60), new Thickness(0, 0, 0, 25), 0),
                    VerticalOptions = LayoutOptions.Center, HorizontalOptions = LayoutOptions.Center });
}

如何在不影响UI性能的情况下正确添加UI视图？

Answer 1

更改网格中的元素后，必须分配主视图：

Content = null; //now mapHolder is detached from your main view hierarchy
mapHolder.Children.Add(map);
    mapHolder.Children.Add(new Image() { Source = "redpin.png", HeightRequest = 50, WidthRequest = 33, Margin = Device.OnPlatform(new Thickness(0, 0, 0, 60), new Thickness(0, 0, 0, 25), 0),
        VerticalOptions = LayoutOptions.Center, HorizontalOptions = LayoutOptions.Center });
Content = mapHolder;