Swiftui specify double format

Question

Text("Värde \(Double(calc2, specifier: "%.2f").rounded())")

//ERROR

I am converting a Slider value that uses a double type, but i cant format specify it? I get an error and xcode tells me to use signaling(?). I've tried putting it into an Int as well.

whats the right move here?

score 16 · Answer 1 · answered Nov 14 '19 at 10:23

You can use

Text("Värde \(calc2, specifier: "%.2f")")

to convert it to 2 decimals.

To have greater flexibility you can use formatter and leverage appendInterpolation on string. Use the below function or something to that effect


func customFormat(_ number: Double) -> String  {
   let customFormatter = NumberFormatter()
   customFormatter.roundingMode = .down
   customFormatter.maximumFractionDigits = 2

   return "\(number, formatter: customFormatter)"   
}

score 7 · Answer 2 · answered Nov 14 '19 at 09:40

7

I assume you want something like

Text("Värde \(String(format: "%.2f", calc2))")

answered Nov 14 '19 at 09:40

Asperi

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Thats the old, compatible style. Looks like `specifier:` was added in SwiftUI – smat88dd Oct 08 '20 at 06:56

score 0 · Answer 3 · answered Nov 14 '19 at 09:58

0

The problem is that Double(calc2, specifier: "%.2f") is optional

to handle it, for example, use Double(calc2, specifier: "%.2f")?.rounded() ?? 0.0

answered Nov 14 '19 at 09:58

Vyacheslav

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Swiftui specify double format

3 Answers3