[英]How can I bind a XAML element on a template with the C# back end instead of in the XAML?
这是我现在所拥有的:
我有一个简化了此问题的模板:
<?xml version="1.0" encoding="UTF-8"?>
<Frame xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:t="clr-namespace:Japanese.Templates"
xmlns:local="clr-namespace:Japanese;assembly=Japanese"
x:Class="Japanese.Templates.RoundButtonText" x:Name="this">
<Label Text="ABC"
TextColor="{Binding LabelTextColor, Source={x:Reference this}}"
/>
</Frame>
和这个C#
using Xamarin.Forms;
namespace Japanese.Templates
{
public partial class RoundButtonText : BaseFrameButtonTemplate
{
public RoundButtonText()
{
InitializeComponent();
// I would like to put the Label TextColor binding here instead of in the XAML
}
}
}
有人可以告诉我如何在C#后端中添加标签TextColor的绑定,以便它以与当前编写时完全相同的方式更改:
TextColor="{Binding LabelTextColor, Source={x:Reference this}}"
在XAML中?
从XAML删除绑定,并为Label控件指定一个x:Name:
<?xml version="1.0" encoding="UTF-8"?>
<Frame xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:t="clr-namespace:Japanese.Templates"
xmlns:local="clr-namespace:Japanese;assembly=Japanese"
x:Class="Japanese.Templates.RoundButtonText" x:Name="this">
<Label x:Name="label"
Text="ABC" />
</Frame>
在后面的C#代码中设置绑定和要绑定的属性:
using Xamarin.Forms;
namespace Japanese.Templates
{
public partial class RoundButtonText : BaseFrameButtonTemplate
{
Color _labelTextColor;
public Color LabelTextColor {
get {
return _labelTextColor;
}
set {
if (_labelTextColor != value) {
_labelTextColor = value;
OnPropertyChanged("LabelTextColor");
}
}
}
public RoundButtonText()
{
InitializeComponent();
label.BindingContext = this;
label.SetBinding(Label.TextColorProperty, "LabelTextColor");
}
}
}
现在,每当LabelTextColor
属性值更改时,Label的TextColor属性也应更改,就像使用XAML绑定一样。
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