<ItemsControl x:Class="HDSProject.Control.CustomFont" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:HDSProject.Control" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800" x:Name="itemCtrl" ItemsSource="{Binding Path=Title2, RelativeSource={RelativeSource Mode=Self}}" FontSize="20" Foreground="Teal" > <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientation="Horizontal"/> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <Border Margin="{Binding Path=CharacterSpacing, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:CustomFont}}"> <TextBlock Text="{Binding}" /> <Border.Style> <Style TargetType="Border"> <Setter Property="BorderThickness" Value="0"/> <Style.Triggers> <DataTrigger Binding="{Binding ShowUnderline, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:CustomFont}}" Value="True"> <Setter Property="BorderThickness" Value="0 0 0 1"/> </DataTrigger> </Style.Triggers> </Style> </Border.Style> <Border.BorderBrush> <SolidColorBrush Color="{Binding Foreground.Color, ElementName=itemCtrl}" /> </Border.BorderBrush> </Border> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl>我希望输入的Title2可以换行，且可以设置行间距该怎么做

您可以将StackPanel替换为一个WrapPanel，这样就可以实现Title2的换行了。而要设置行间距，您可以在WrapPanel中添加一个Margin属性，来实现行间距的设置。具体的修改代码如下：

<ItemsControl x:Class="HDSProject.Control.CustomFont"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:local="clr-namespace:HDSProject.Control"
        mc:Ignorable="d"
        d:DesignHeight="450" d:DesignWidth="800"
        x:Name="itemCtrl"
        ItemsSource="{Binding Path=Title2, RelativeSource={RelativeSource Mode=Self}}"
        FontSize="20" Foreground="Teal">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapPanel Orientation="Horizontal" Margin="0 10 0 0"/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Border Margin="{Binding Path=CharacterSpacing, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:CustomFont}}">
                <TextBlock Text="{Binding}" />
                <Border.Style>
                    <Style TargetType="Border">
                        <Setter Property="BorderThickness" Value="0"/>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding ShowUnderline, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:CustomFont}}" Value="True">
                                <Setter Property="BorderThickness" Value="0 0 0 1"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Border.Style>
                <Border.BorderBrush>
                    <SolidColorBrush Color="{Binding Foreground.Color, ElementName=itemCtrl}" />
                </Border.BorderBrush>
            </Border>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

在WrapPanel中加入了Margin属性，实现了行间距的设置。