write method
Is called when a value has to be encoded.
Implementation
@override
void write(BinaryWriter writer, Category obj) {
writer
..writeByte(4)
..writeByte(0)
..write(obj.cname)
..writeByte(1)
..write(obj.cpic)
..writeByte(2)
..write(obj.subcategories)
..writeByte(3)
..write(obj.cid);
}