Cannot convert value of type 'String' to expected argument type 'DefaultStringInterpolation'

Question

I upgraded my swift 4.2 application to Swift 5 and I get this error. Does anyone know how to fix?

File using: GMStepper.swift

Error: Cannot convert value of type 'String' to expected argument type 'DefaultStringInterpolation'

if self.showIntegerIfDoubleIsInteger && floor(self.value) == self.value {
            label.text = String(stringInterpolation: "\(Int(self.value))\(self.suffixString)")
        } else {
            label.text = String(stringInterpolation: "\(Int(self.value))\(self.suffixString)")
        }

Mohsen Fard · Accepted Answer · 2019-04-15 11:50:29Z

1

You should do like this :

if self.showIntegerIfDoubleIsInteger && floor(self.value) == self.value {
        let intValue =  Int(self.value)
        label.text = String(stringInterpolation: "\(intValue)\(self.suffixString)")
    } else {
        let intValue =  Int(self.value)
        label.text = String(stringInterpolation: "\(intValue))\(self.suffixString)")
    }

answered Apr 15, 2019 at 11:50

Mohsen Fard

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Comments

OOPer · Accepted Answer · 2019-04-14 16:06:21Z

0

You should not call String.init(stringInterpolation:) directly.

init(stringInterpolation:)

Discussion

Do not call this initializer directly. It is used by the compiler when you create a string using string interpolation. Instead, use string interpolation to create a new string by including values, literals, variables, or expressions enclosed in parentheses, prefixed by a backslash (\(…)).

Why don't you simply write your code as:

    if self.showIntegerIfDoubleIsInteger && floor(self.value) == self.value {
        label.text = "\(Int(self.value))\(self.suffixString)"
    } else {
        label.text = "\(Int(self.value))\(self.suffixString)"
    }

answered Apr 14, 2019 at 16:06

OOPer

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