Question

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的文本块放在HomePageView页面中。这是它的xaml：

<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HomePageView代码中的LoadState：

 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
            {

            }
        }

我构建了一个名为SettingsPage的设置窗格（条形图 - >设置 - ＆gt;设置），其中放置了名为timeSlider的滑块。这是它的xaml：

<Slider x:Name="timeSlider" Width="257" Minimum="1" Maximum="600" Loaded="timeSlider_Loaded" ValueChanged="timeSlider_ValueChanged" />

这些是在SettingsPage代码隐藏中放置的滑块Loaded和ValueChanged方法：

 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();
        }

您可以在我的skydrive上下载完整的解决方案：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value属性（在SettingsPage页面中），因此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，以在关闭并重新打开应用程序时保留其值。

解决方案有效，但问题是：当我进入设置窗格（魅力栏 - ＆gt;设置 - ＆gt;设置）并通过滑块更改textblock fontsize属性时，我回到主页视图并重新打开设置如果窗格，fontsize属性重新初始化为其原始值，因此它不保留以前（用户选择的）值。你能修好我的代码吗？非常感谢你提前。

Answer 1

您必须在if (sliderIstance.Value != 1)事件

中添加一个条件timeSlider_ValueChanged

private void timeSlider_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)
{
    var sliderIstance = sender as Slider;
    if (sliderIstance.Value != 1)
        ApplicationData.Current.LocalSettings.Values["myTextBlockSize"] = sliderIstance.Value as double?;
    var _Frame = Window.Current.Content as Frame;
    _Frame.Navigate(_Frame.Content.GetType());
    _Frame.GoBack();
}

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

1 个答案: