[英]Xamarin Forms Change label text in Frame
我有个问题。 我创建了这个框架:
<Frame BackgroundColor="Black" BorderColor="DarkGray" CornerRadius="20" HeightRequest="40" Padding="10,0,10,0">
<Label Text="{Binding Name}" FontSize="20" TextColor="White" VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand"/>
<Frame.GestureRecognizers>
<TapGestureRecognizer Tapped="Category_Clicked" />
</Frame.GestureRecognizers>
</Frame>
在后面的代码中,我有这个事件:
List<string> selectedCategories = new List<string>();
private void Category_Clicked(object sender, EventArgs e)
{
Frame frame = (Frame)sender;
if (frame.BackgroundColor == Color.Black)
{
frame.BackgroundColor = Color.FromHex("#2196F3");
//Add label text to list
}
else
{
frame.BackgroundColor = Color.Black;
//Remove label text from list
}
}
但我需要从框架内的标签访问文本。 我怎样才能做到这一点?
从Frame
Content
属性获取标签。
private void Frame_Tapped(object sender, EventArgs e)
{
Frame tappedFrame = (sender as Frame);
Label childLabel = (tappedFrame.Content as Label);
var resultText = childLabel.Text;
}
即使您不知道BindingContext
的类型也能工作。
<Frame BackgroundColor="Black" BorderColor="DarkGray" CornerRadius="20" HeightRequest="40" Padding="10,0,10,0">
<Label x:Name = "MyTxt" Text="{Binding Name}" FontSize="20" TextColor="White" VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand"/>
<Frame.GestureRecognizers>
<TapGestureRecognizer Tapped="Category_Clicked" />
</Frame.GestureRecognizers>
在代码隐藏中:
if (frame.BackgroundColor == Color.Black)
{
frame.BackgroundColor = Color.FromHex("#2196F3");
//Add label text to list
MyTxt.text = "Some Text";
}
else
{
frame.BackgroundColor = Color.Black;
//Remove label text from list
MyTxt.text = "";
}
使用BindingContext
Frame frame = (Frame)sender;
var item = (MyClassName)frame.BindingContext
var name = item.Name;
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.