如何解决如何使用单击事件更改字体真棒图标?
我在 XAML 文件中指定了很棒的字体。问题是如何在单击按钮时更改字体真棒图标,并在再次单击按钮时将其更改回原始。
Xamarin 表单中的 FontAwesome
<ImageButton x:Name="stopWatch" BackgroundColor="Green" HeightRequest="60" WidthRequest="60"
VerticalOptions ="End" HorizontalOptions ="Center" Margin="10,25,10,10"
CornerRadius="30"
Padding="1" Opacity="0.5"
Clicked="Button_Onpressed" >
<ImageButton.source>
<FontimageSource FontFamily="{x:StaticResource FontAwesomeRegular}"
Glyph="{x:Static fontawesome:FontAwesomeIcons.ArrowAltCircleDown}"
Color="{AppThemeBinding Dark=Green,Light=White}"/>
</ImageButton.source>
<ImageButton.IsVisible>
<OnPlatform x:TypeArguments="x:Boolean">
<On Platform="iOS"
Value="true" />
<On Platform="Android"
Value="false" />
</OnPlatform>
</ImageButton.IsVisible>
</ImageButton>
没有字体真棒的点击事件(我无法指定带有真棒字体的图标)
private void Button_Onpressed(object sender,EventArgs e)
{
if (ButtonBackColor == true)
stopWatch.source = "connection.png";
else stopWatch.source = "signal.png";
ButtonBackColor = !ButtonBackColor;
}
更新
在 App.xaml 中定义 fontAwesome
<ResourceDictionary>
<OnPlatform x:TypeArguments="x:String"
x:Key="FontAwesomeBrands">
<On Platform="Android"
Value="FontAwesome5Brands.otf#Regular" />
<On Platform="iOS"
Value="FontAwesome5Brands-Regular" />
<On Platform="UWP"
Value="/Assets/FontAwesome5Brands.otf#Font Awesome 5 Brands" />
</OnPlatform>
<OnPlatform x:TypeArguments="x:String"
x:Key="FontAwesomeSolid">
<On Platform="Android"
Value="FontAwesome5Solid.otf#Regular" />
<On Platform="iOS"
Value="FontAwesome5Free-Solid" />
<On Platform="UWP"
Value="/Assets/FontAwesome5Solid.otf#Font Awesome 5 Free" />
</OnPlatform>
<OnPlatform x:TypeArguments="x:String"
x:Key="FontAwesomeRegular">
<On Platform="Android"
Value="FontAwesome5Regular.otf#Regular" />
<On Platform="iOS"
Value="FontAwesome5Free-Regular" />
<On Platform="UWP"
Value="/Assets/FontAwesome5Regular.otf#Font Awesome 5 Free" />
</OnPlatform>
</ResourceDictionary>
解决方法
对于AppThemeBinding
,目前代码似乎不支持Ability to set AppThemeBinding on Styles in code,您可以测试一次Application.Current.UserAppTheme
,但它不会是动态的。
using System.Linq;
...
private void Button_OnPressed(object sender,EventArgs e)
{
Application.Current.Resources.TryGetValue("FontAwesomeRegular",out object fontFamily);
if (fontFamily == null)
//this should not occurred,throw an exception
string fontFamilyString = Device.RuntimePlatform switch
{
Device.Android => (fontFamily as OnPlatform<string>).Platforms.Where(x => x.Platform[0].Equals(Device.Android)).Select(x => (string)x.Value).FirstOrDefault(),Device.iOS => (fontFamily as OnPlatform<string>).Platforms.Where(x => x.Platform[0].Equals(Device.iOS)).Select(x => (string)x.Value).FirstOrDefault(),Device.UWP => (fontFamily as OnPlatform<string>).Platforms.Where(x => x.Platform[0].Equals(Device.UWP)).Select(x => (string)x.Value).FirstOrDefault(),_ => string.Empty
};
if (ButtonBackColor == true)
{
stopWatch.Source = new FontImageSource()
{
FontFamily= fontFamilyString,Glyph = FontAwesomeIcons.ArrowAltCircleDown,Color = Application.Current.UserAppTheme == OSAppTheme.Dark
? Color.Green
: Color.White;
};
}
else
{
stopWatch.Source = new FontImageSource()
{
FontFamily= fontFamilyString,Glyph = FontAwesomeIcons.ArrowAltCircleUp,Color = Application.Current.UserAppTheme == OSAppTheme.Dark
? Color.Green
: Color.White;
};
}
ButtonBackColor = !ButtonBackColor;
}
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