Question 131137 in Xcode Question posted in
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Xcode – Swift: Adding negative numbers

I’ve got a pretty simple problem with adding negative numbers, but Apple Documentation doesn’t really cover this.

SwiftUI Code:

Text(String(-50 + 5))

This throws the error, Compiling failed: Ambiguous use of operator '-'. However, Text(String(-50)) doesn’t throw any errors.

I’ve tried casting -50 as an Int and wrapping it in parentheses. Also, if I assign -50 + 5 to a variable, and then use the variable in the Text(), it works fine. How can I get this to display -45, and what’s causing the error?

Note: Using XCode 13.2.1 on macOS Monterey

EDIT: People are asking for a screenshot, as it seems the issue isn’t occurring for everyone. Here’s the issue in a brand new project.

Screenshot

Tags:

2

Answers


  1. 0

    Check out Canvas diagnostics:

    Swift.Float16:3:31: note: found this candidate
    prefix public static func - (x: Float16) -> Float16
                              ^
Swift.Float:2:31: note: found this candidate
    prefix public static func - (x: Float) -> Float
                              ^
Swift.Double:2:31: note: found this candidate
    prefix public static func - (x: Double) -> Double
                              ^
Swift.Float80:2:31: note: found this candidate
    prefix public static func - (x: Float80) -> Float80

    and tell Xcode which type you wanna use:

    e.g.

    Text(String(-Int(50) + 5))

    or

    Text(String(-50.0 + 5))
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  2. 0

    See the error, it probably code can’t reconize -50 to int.

    Swift.Float16:3:31: note: found this candidate
    prefix public static func - (x: Float16) -> Float16
                              ^
Swift.Float:2:31: note: found this candidate
    prefix public static func - (x: Float) -> Float
                              ^
Swift.Double:2:31: note: found this candidate
    prefix public static func - (x: Double) -> Double
                              ^
Swift.Float80:2:31: note: found this candidate
    prefix public static func - (x: Float80) -> Float80

    So I test for some example like this is wrok.

    let a =  -Int(50) + 3
let b =  -50.0 + 3
let c:Int = -50 + 3

Text(String(-Int(50) + 3))
Text(String(a))
Text(String(b))
Text(String(c))
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