XCode How to evaluate String formula with an X expression inside

Question

I\'m tring to evaluate a string formula to a float but, I cannot find a solution. Here is an example. I need to calculate about 200 formulas in this way.

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Answer 1

Swifty Answer,

let formula = "12.845*x+(-0.505940)"
let x = 12

let expr = NSExpression(format: formula)
let object = ["x":x]

let result = expr.expressionValue(with: object, context: nil)

print(result)
//Output: 153.63406