addFont method Null safety

void addFont(
  1. Future<ByteData> bytes

Registers a font asset to be loaded by this font loader.

The bytes argument specifies the actual font asset bytes. Currently, only OpenType (OTF) and TrueType (TTF) fonts are supported.


void addFont(Future<ByteData> bytes) {
  if (_loaded) {
    throw StateError('FontLoader is already loaded');

      (ByteData data) => Uint8List.view(data.buffer, data.offsetInBytes, data.lengthInBytes),