我希望你能帮助我解决我的问题。我有一个简单的地铁应用程序。名为myTextBlock的文本块位于HomePageView页面中。这是它的XAML:如何将滑块值链接到文本块的FontSize并将该值存储在ApplicationData变量中
<TextBlock x:Name="myTextBlock" Text="Hello" HorizontalAlignment="Center" VerticalAlignment="Top" Style="{StaticResource timeStyle}" TextAlignment="Center" FontSize="300" RenderTransformOrigin="0.5,0.5" Margin="11,55,3,0" ManipulationMode="All">
这是在主页的代码在LoadState背后:
protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
try
{
double? myTextBlockValue = (double?)ApplicationData.Current.LocalSettings.Values["myTextBlockSize"];
if (myTextBlockValue != null)
{
myTextBlock.FontSize = (double)myTextBlockValue;
}
}
catch
{
}
}
我建了一个设置面板(魅力吧 - >设置 - >设置)命名SettingsPage其中滑块名为timeSlider被放置。这是它的XAML:
<Slider x:Name="timeSlider" Width="257" Minimum="1" Maximum="600" Loaded="timeSlider_Loaded" ValueChanged="timeSlider_ValueChanged" />
而这些滑块加载和的ValueChanged方法放在SettingsPage代码隐藏:
private void timeSlider_Loaded(object sender, RoutedEventArgs e)
{
var sliderIstance = sender as Slider;
double? storedSize = (double?)ApplicationData.Current.LocalSettings.Values["myTextBlockSize"];
if (storedSize != null && storedSize != 1)
sliderIstance.Value = (double)storedSize;
else
sliderIstance.Value = 300;
}
private void timeSlider_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)
{
var sliderIstance = sender as Slider;
ApplicationData.Current.LocalSettings.Values["myTextBlockSize"] = sliderIstance.Value as double?;
var _Frame = Window.Current.Content as Frame;
_Frame.Navigate(_Frame.Content.GetType());
_Frame.GoBack();
}
您可以在这里下载完整的解决方案在我的SkyDrive:https://skydrive.live.com/redir?resid=1B721133DC03E67C!7350
通过这种方式,我将myTextBlock的fontsize属性(在HomePageView页面中)链接到滑块的值属性(在SettingsPage页面中),以便用户可以在运行时更改此属性。此外,此属性存储在myTextBlockSize ApplicationData变量中,以在应用程序关闭并重新打开时保留其值。
该解决方案的工作原理是:当我进入设置窗格(魅力酒吧 - >设置 - >设置),并通过滑块更改textblock fontsize属性,然后我回到主页视图并重新打开设置窗格,fontsize属性会重新初始化为其原始值,因此它不会保留先前(用户选择的)值。 你能解决我的代码吗?非常感谢你提前。
谢谢你加一个条件
if (sliderIstance.Value != 1)
。你有解决方案。非常简单! :) – user1941332 2013-04-09 20:36:40