tcp连接逻辑

添加登录动画

View/LogPage.xaml

@@ -3,6 +3,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              x:Class="SunlightAggregationTerminal.View.LogPage"
              Title="登录">
+    <Grid>
     <VerticalStackLayout Padding="30" Spacing="10" 
             VerticalOptions="Center" 
             HorizontalOptions="Center"
@@ -75,4 +76,20 @@
                 Margin="0,10,0,0"
                 Clicked="Log_Clicked"/>
     </VerticalStackLayout>
+        <Grid x:Name="LoadingIndicator" BackgroundColor="Gray" 
+              IsVisible="False">
+            <VerticalStackLayout Padding="30" Spacing="10"       
+                                 VerticalOptions="Center"       
+                                 HorizontalOptions="Center">
+                <ActivityIndicator IsRunning="True"    
+                               Color="Blue"  
+                               HorizontalOptions="Center"   
+                               VerticalOptions="Center" />
+            <Label Text="登录中..."
+                   FontAttributes="Bold"
+                   FontSize="24" 
+                   TextColor="Black"/>
+            </VerticalStackLayout>
+        </Grid>
+    </Grid>
 </ContentPage>