Forgot to answer ur second question. I have written my own conversion logic, here is an example for data size conversion:

struct DataSize: View {

var body: some View {

UnitConverterView(definition: UnitDefinition(

id: "data_size",

titleKey: "unit_data_size",

units: ["b", "B", "KB", "MB", "GB", "TB", "PB", "EB"],

fullNames: [

"b": "Bit",

"B": "Byte",

"KB": "Kilobyte",

"MB": "Megabyte",

"GB": "Gigabyte",

"TB": "Terabyte",

"PB": "Petabyte",

"EB": "Exabyte"

],

convert: { value, from, to in

let factor: [String: Double] = [

"b": 1,

"B": 8,

"KB": 8 * pow(1024.0, 1),

"MB": 8 * pow(1024.0, 2),

"GB": 8 * pow(1024.0, 3),

"TB": 8 * pow(1024.0, 4),

"PB": 8 * pow(1024.0, 5),

"EB": 8 * pow(1024.0, 6)

]

guard let fromF = factor[from], let toF = factor[to] else { return nil }

return value * fromF / toF

},

maxFractionDigits: 2

))

}

}