Change label size per screen size xamarin forms

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I'm using xamarin.forms to do an app and I perceived that to use the same size to letter to ios devices is not working: on 7 plus it works well, but on iphone 5 it's a Big letter for the size of the screen... Do someone know a way to do letter with scallable size, or change the size for a specific device or type of screen size? Thank you very much.

xamarin.forms xamarin layout xaml c#
1 Answers

You can refer following samples:

  1. Estimate font-size for visual consistency - (docs | github)

    // 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. Fitting text to available size - (docs | github)

    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));
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