Swiftui specify double format

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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?

I assume you want something like

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

How to specify floating-point precision in a string, For example, if a number is 45.6789, you might only want to show two digits after the decimal place. Here's an example using basic string� Swift's string interpolation makes it easy to put floating-point numbers into a string, but it lacks the ability to specify precision. For example, if a number is 45.6789, you might only want to show two digits after the decimal place. Here's an example using basic string interpolation: let angle = 45.6789 let raw = "Angle: \(angle)"

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

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

Swiftui specify double format, I assume you want something like. Text("V�rde \(String(format: "%.2f", calc2))"). If you initialize a text view with a string literal, the view uses the init(_: table Name: bundle: comment:) initializer, which interprets the string as a localization key and searches for the key in the table you specify, or in the default table if you don’t specify one.

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)"   
}

Floating point precision in Swift String, If you'd like to interpolate a float or a double with a String in Swift, use the %f String format specifier with appropriate number in order to specify� The numeric month of the year. A double M will use ’01’ for January. MMM: Nov: The shorthand name of the month: MMMM: November: Full name of the month: MMMMM: N: Narrow name of the month: Day: d: 26: The day of the month. A single d will use 1 for January 1st. dd: 26: The day of the month. A double d will use 01 for January 1st. F: 4th Wednesday in December

ANOTHER EXAMPLE OF SWIFTUI GARBAGE!, Just another frustraing example of why I HATE SWIFTUI Note that Double. round() is a mathematical function; it's used to round NumberFormatter has a vast array of options, and will let you format integer and real values in To round a value to two decimal places you need to set a numberStyle of .decimal and set both . The return value can be PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol, or the string representation of a number, as specified by format.. The format parameter can be any valid standard numeric format specifier except for D and X, as well as any combination of custom numeric format specifiers.

String Format Specifiers, Explains how to create, search, concatenate, and draw strings in Cocoa. struct PolygonShape: Shape { var sides: Double var animatableData: Double { get { return sides } set { sides = newValue } } } Drawing Sides with a Decimal Number. Finally, we need to teach SwiftUI how to draw a polygon with a non-integer number of sides. We will slightly alter our code.

You can use Swift’s round function to accomplish this. To round a Double with 3 digits precision, first multiply it by 1000, round it and divide the rounded result by 1000: let x = 1.23556789 let y = Double (round (1000*x)/1000) print (y) // 1.236

Comments
  • just to add: the double is in the beginning (before sliding) of type NaN so that's why it doesnt work..