Build an array of UnitMass values to present to UI/user as a list of unit options to measure weight

Question

Problem: Present an array of

UnitMass

values, to present to my app user in a simple table view, to facilitate a user selection.

The intention is that this

selectedUnit
could then be used in conjunction with the

Measurement

framework, in the following manner:

let measureWeight = Measurement(value: tempMeasure.value, unit: selectedUnit)

Essentially I want to build an array of available UnitMass... for example:

let arrayUnitMass: [UnitMass] = [.carats, .centigrams, .decigrams, .grams, .kilograms, etc...]

But I want to do this dynamically and from the

UnitMass

units available in Foundation.

I could write an extension on

UnitMass

to conform to

CaseIterable

, but then, as far as I understand, I'd have to implement my own definition of

.allCases

. (Based on "Enumerating enum cases in Swift", an article written by Ole Bergemann).

So maybe I'd be better off writing my own

Enum

for

UnitMass

...

enum SelectUnitMass {
    case carats, centigrams, decigrams, grams, kilograms//, etc...
}

Frankly I'm too lazy to maintain this

enum

myself and so, as mentioned above, I want to do this dynamically from the

UnitMass

units available in Foundation. The benefit for this choice will IMHO ensure parity with any future additions (but maybe not deletions).

This SO "Get all enum values as an array" is informative, however it does not seem to provide any hints to a solution.

Are you aware of some way to prepare an array of all

UnitMass

units available in Foundation?

892

Posted by

andrewbuilder

Reply

Answer 1

I did not find a solution.

But this seems to point in a direction that could help do it without CaseIretable:

h ttps://medium.com/@londeix/listing-all-cases-in-an-enum-3b057f2c1432

Posted by

Claude31

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