C# Listview中的行不工作
我有一个listview，里面有三个不同的单元格内容，其中只有一个通过绑定检查显示在该单元格上。我没有设置视图单元格的高度，而是将其堆栈布局子级的垂直选项设置为“填充”。现在，它可以在android上运行，但在iOs上却无法运行。我已经将HasUnderstance rows设置为true，但是轻敲每个单元格时，我注意到高度是相同的。我将显示xaml代码和项源代码：C# Listview中的行不工作,c#,ios,listview,xamarin,xamarin.forms,C#,Ios,Listview,Xamarin,Xamarin.forms,我有一个listview，里面有三个不同的单元格内容，其中只有一个通过绑定检查显示在该单元格上。我没有设置视图单元格的高度，而是将其堆栈布局子级的垂直选项设置为“填充”。现在，它可以在android上运行，但在iOs上却无法运行。我已经将HasUnderstance rows设置为true，但是轻敲每个单元格时，我注意到高度是相同的。我将显示xaml代码和项源代码： <ListView x:Name = "lvConversations" Vertic
<ListView
x:Name = "lvConversations"
VerticalOptions = "FillAndExpand"
HorizontalOptions = "FillAndExpand"
IsGroupingEnabled = "false"
SeparatorVisibility = "None"
HasUnevenRows = "true"
ItemSelected = "messageSelected"
BackgroundColor = "#F8F8F8"
>
<ListView.ItemTemplate>
<DataTemplate>
<local:ScaledViewCell>
<local:ScaledStackLayout
VerticalOptions = "Fill"
HorizontalOptions = "FillAndExpand"
Orientation = "Vertical"
Spacing = "0">
<local:ScaledStackLayout
VerticalOptions = "Fill"
HorizontalOptions = "FillAndExpand"
Orientation = "Vertical"
Spacing = "0"
IsVisible = "{Binding isGroupHeader, Converter = {StaticResource inverter}}"
BackgroundColor = "Transparent">
<!-- OUTGOING -->
<local:ScaledStackLayout
HorizontalOptions = "FillAndExpand" Orientation = "Horizontal"
IsVisible = "{Binding isOutgoing}">
<local:ScaledStackLayout
VerticalOptions = "Fill"
HorizontalOptions = "EndAndExpand"
BackgroundColor = "Transparent"
Orientation = "Vertical"
Margin = "21,14,15,0"
Spacing = "0">
<local:ScaledStackLayout
Orientation = "Horizontal"
VerticalOptions = "Fill"
HorizontalOptions = "EndAndExpand"
Spacing = "0"
>
<local:CorneredView
CornerRadius = "15"
BackgroundColor = "#d3eaf6"
VerticalOptions = "Fill"
HorizontalOptions = "End"
>
<Label
VerticalOptions = "Fill"
HorizontalOptions = "Fill"
Text = "{Binding message}"
FontSize = "10"
TextColor = "Black"
Margin = "7,10,7,10"
LineBreakMode = "WordWrap"
/>
</local:CorneredView>
<Image
Margin = "0,11,7,0"
Source = "ic_msg_arrow_outgoing"
WidthRequest = "5"
HeightRequest = "10"
Aspect = "AspectFit"
BackgroundColor = "Transparent"
VerticalOptions = "Start"
/>
<ffimageloading:CachedImage
WidthRequest = "37"
HeightRequest = "37"
BackgroundColor = "Transparent"
VerticalOptions = "Start"
Aspect = "AspectFill"
Source = "{Binding sender.imageUrl}"
DownsampleToViewSize = "true"
DownsampleUseDipUnits = "true"
>
<ffimageloading:CachedImage.Transformations>
<fftransformations:CircleTransformation>
<x:Arguments>
<x:Double>2</x:Double>
<x:String>#FF8A07</x:String>
</x:Arguments>
</fftransformations:CircleTransformation>
</ffimageloading:CachedImage.Transformations>
</ffimageloading:CachedImage>
</local:ScaledStackLayout>
<Label
Margin = "0,3,0,0"
VerticalOptions = "Center"
HorizontalOptions = "Start"
Text = "{Binding formattedDateSent}"
HeightRequest = "10"
FontSize = "8"
TextColor = "#4D212121"/>
</local:ScaledStackLayout>
</local:ScaledStackLayout>
<!--INCOMING-->
<local:ScaledStackLayout
WidthRequest = "284"
VerticalOptions = "Fill"
BackgroundColor = "Transparent"
Orientation = "Vertical"
Margin = "15,14,21,0"
Spacing = "0"
IsVisible = "{Binding isOutgoing, Converter = {StaticResource inverter}}">
<local:ScaledStackLayout
Orientation = "Horizontal"
WidthRequest = "284"
VerticalOptions = "Fill"
Spacing = "0"
>
<ffimageloading:CachedImage
WidthRequest = "37"
HeightRequest = "37"
BackgroundColor = "Transparent"
VerticalOptions = "Start"
Aspect = "AspectFill"
Source = "{Binding sender.imageUrl}"
DownsampleToViewSize = "true"
DownsampleUseDipUnits = "true"
>
<ffimageloading:CachedImage.Transformations>
<fftransformations:CircleTransformation>
<x:Arguments>
<x:Double>2</x:Double>
<x:String>#FF8A07</x:String>
</x:Arguments>
</fftransformations:CircleTransformation>
</ffimageloading:CachedImage.Transformations>
</ffimageloading:CachedImage>
<Image
Margin = "7,15,0,0"
Source = "ic_msg_arrow_incoming"
WidthRequest = "5"
HeightRequest = "10"
Aspect = "AspectFit"
BackgroundColor = "Transparent"
VerticalOptions = "Start"
/>
<local:CorneredView
WidthRequest = "235"
VerticalOptions = "Fill"
CornerRadius = "15"
BackgroundColor = "#ECECEC"
IsClippedToBounds = "true"
>
<Label
VerticalOptions = "Fill"
HorizontalOptions = "FillAndExpand"
Text = "{Binding message}"
FontSize = "10"
TextColor = "Black"
Margin = "7,10,7,10"
LineBreakMode = "WordWrap"
/>
</local:CorneredView>
</local:ScaledStackLayout>
<Label
Margin = "0,3,0,0"
VerticalOptions = "Center"
HorizontalOptions = "End"
Text = "{Binding formattedDateSent}"
HeightRequest = "10"
FontSize = "8"
TextColor = "#4D212121"/>
</local:ScaledStackLayout>
</local:ScaledStackLayout>
<!--Message Group-->
<local:ScaledStackLayout
Margin = "0"
Padding = "0"
Spacing = "0"
Orientation = "Vertical"
VerticalOptions = "Fill"
IsVisible = "{Binding isGroupHeader}"
BackgroundColor = "Transparent"
>
<!--label and button-->
<local:ScaledStackLayout
Margin = "9,0,9,0"
HeightRequest = "19"
Orientation = "Horizontal"
Padding = "0,5,7,0"
BackgroundColor = "Transparent">
<Label
Text = "{Binding groupHeaderTitle}"
HorizontalOptions = "FillAndExpand"
HeightRequest = "8"
FontSize = "8"
TextColor = "#212121"
VerticalTextAlignment = "Center"
HorizontalTextAlignment = "Center"
BackgroundColor = "Transparent"/>
</local:ScaledStackLayout>
<BoxView
Margin = "9,0,9,0"
HorizontalOptions = "FillAndExpand"
HeightRequest = "1"
BackgroundColor = "#4D212121"/>
</local:ScaledStackLayout>
</local:ScaledStackLayout>
</local:ScaledViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
2.
#FF8A07
2.
#FF8A07
public void OnSuccess(JObject response, BaseAPI caller)
{
if (Constants.isDebug)
{
JObject json = TestData.getTestData("conversation_messages_listed.json");
response = json;
}
ObservableCollection<Message> arrMessages = JsonConvert.DeserializeObject<ObservableCollection<Message>>(response["messages"].ToString(), new JsonSerializerSettings()
{
NullValueHandling = NullValueHandling.Ignore,
MissingMemberHandling = MissingMemberHandling.Ignore
});
lvConversations.ItemsSource = arrMessages;
}
public void OnSuccess（JObject响应，BaseAPI调用方）
{
if（常量.isDebug）
{
JObject json=TestData.getTestData（“对话消息列表.json”）；
response=json；
}
ObservableCollection arrMessages=JsonConvert.DeserializeObject（响应[“messages”].ToString（），新的JsonSerializerSettings（）
{
NullValueHandling=NullValueHandling.Ignore，
MissingMemberHandling=MissingMemberHandling.Ignore
});
lvConversations.ItemsSource=arrMessages；
}
请帮助，我是xamarin的新手。默认情况下，这些行在iOS上不起作用。见此： iOS不支持自动调整行单元格大小，必须设置ListView.RowHeight或Cell.Height。不幸的是，我们并没有明确禁止在Android或Windows Phone上使用这一功能（在没有我们干预的情况下，它可以正常工作），这让一些人相信iOS在这方面是有缺陷的 不幸的是，这是iOS平台的一个限制，因此是预期的行为 查看下表也可能会有所帮助 当应用程序开发人员将ListView.Rows属性设置为true时，列表视图的行为仍取决于ListView.RowHeight属性。首先，如果开发人员未设置ListView.RowHeight属性或将其设置为-1，则列表视图项将自动调整大小以适合其内容。如上所述，这是ListView.HasRows值为true的所需行为和预期用例。其次，如果开发人员将ListView.RowHeight属性设置为0或-1以外的负值，则ListView中的所有行，无论其内容的高度如何，都将具有系统的默认高度。第三，也是最后一点，如果开发人员将ListView.RowHeight设置为正值，则ListView中的所有行，无论其内容的高度如何，都将与ListView.RowHeight一样高，就像ListView.rows被设置为false一样
单击后，您可以调用
ForceUpdateSize（）var clicked = (StackLayout)sender;
((ViewCell)((Grid)((StackLayout)((PancakeView)((StackLayout)clicked.Parent).Parent).Parent).Parent).Parent).ForceUpdateSize();
如果没有ScaledStackLayout、ScaledViewCell和CorneredView的代码，很难说，如果您想提供示例来重现问题，它可能会加快解决速度。这些只是Stacklayout、viewcell和frame的简单子类。除了根据设备屏幕尺寸调整大小外，与超类相比没有太多变化。我在应用程序的其他页面上使用了它，所以我很确定它不会出现在导致问题的页面上。我需要编写大量代码来重现（message类、inveter等）。如果你仍然需要帮助，请提供样品项目。