根据屏幕尺寸更改标签尺寸 xamarin 表单

我正在使用 xamarin.forms 来做一个应用程序，我发现使用相同的大小来向 ios 设备发送字母是行不通的：在 7 plus 上它运行良好，但在 iphone 5 上它对于屏幕大小来说是一个大字母... 有人知道如何制作具有可缩放尺寸的字母，或者更改特定设备或屏幕尺寸类型的尺寸吗？ 非常感谢。

您可以参考以下示例：

1. 估计字体大小以保持视觉一致性 - (docs https://developer.xamarin.com/guides/xamarin-forms/creating-mobile-apps-xamarin-forms/summaries/chapter05/#Estimated_font_sizes | github https://github.com/xamarin/xamarin-forms-book-samples/blob/master/Chapter05/FontSizes/FontSizes/FontSizes/FontSizesPage.cs#L53)

   // Resolution in device-independent units per inch.
   double resolution = 160;
   
   // Do some numeric point sizes.
   int[] ptSizes = { 4, 6, 8, 10, 12 };
   
   // Select numeric point size you need from ptSize[] array 
   double ptSize = 4;
   
   // this is your new visually consistent font-size.
   var fontSize = resolution * ptSize / 72; 
   

2. 将文本调整为可用大小 - (docs https://developer.xamarin.com/guides/xamarin-forms/creating-mobile-apps-xamarin-forms/summaries/chapter05/#Fitting_text_to_available_size | github https://github.com/xamarin/xamarin-forms-book-samples/blob/master/Chapter05/EstimatedFontSize/EstimatedFontSize/EstimatedFontSize/EstimatedFontSizePage.cs#L51)

   double lineHeight = Device.OnPlatform(1.2, 1.2, 1.3);//TODO: Change this to Device.RuntimePlatform
   double charWidth = 0.5;
   
   int charCount = text.Length;
   
   var view = this.Parent;
   // Because:
   //   lineCount = view.Height / (lineHeight * fontSize)
   //   charsPerLine = view.Width / (charWidth * fontSize)
   //   charCount = lineCount * charsPerLine
   // Hence, solving for fontSize:
   int fontSize = (int)Math.Sqrt(view.Width * view.Height /
                       (charCount * lineHeight * charWidth));