使用 c# 更改 FontAwesome 文本和字体系列 - xamarin.forms [英] Change FontAwesome text and fontfamily with c# - xamarin.forms

问题描述

我在我的解决方案(android 和 ios)中添加了 FontAwesome 字体，我可以毫无问题地从 xaml 使用它.

I added the FontAwesome fonts in my solutions (android and ios) and i can use it from xaml without any problem.

我的 xaml 代码

   <Label x:Name="Star1" Text="&#xf005;" FontSize="22" FontFamily="{StaticResource FontAwesomeRegular}"/>

应用程序.xaml

        <OnPlatform x:TypeArguments="x:String" 
                    x:Key="FontAwesomeSolid"> 
          <On Platform="Android" 
              Value="FontAwesome5Solid.otf#Regular" /> 
          <On Platform="iOS" 
              Value="FontAwesome5Free-Solid" />  
        </OnPlatform> 

        <OnPlatform x:TypeArguments="x:String" 
                    x:Key="FontAwesomeRegular">
          <On Platform="Android" 
              Value="FontAwesome5Regular.otf#Regular" /> 
          <On Platform="iOS" 
              Value="FontAwesome5Free-Regular" />
        </OnPlatform>

我想在点击时更改某些标签中的字体系列和文本值.我尝试了以下代码但不起作用.

I want to change the fontfamily and Text value in some label on tap. I try the following code but is not working.

        TapGestureRecognizer starEvent = new TapGestureRecognizer();
        starEvent.Tapped += (sender, e) => {
            Star1.FontFamily = Application.Current.Resources["FontAwesomeSolid"].ToString();
            Star1.Text = "\uf005";
        };

        Star1.GestureRecognizers.Add(starEvent);

Application.Current.Resources["FontAwesomeSolid"].ToString() 返回给我

The Application.Current.Resources["FontAwesomeSolid"].ToString() returns me

"Xamarin.Forms.OnPlatform`1[System.String]"

"Xamarin.Forms.OnPlatform`1[System.String]"

推荐答案

问题在于OnPlatform的使用.我不确定为什么它不会像这样工作，我想这与它在内部的铸造方式有关.

The problem is the use of OnPlatform. I'm not sure why it won't work like this, I guess it's related to how it's casted internally.

试试这个，应该可以:

Star1.FontFamily = (Xamarin.Forms.OnPlatform<string>)Application.Current.Resources["FontAwesomeSolid"];

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