StringInterpolation inside SwiftUI

Question

jedilord OP

Created Jun ’19

Replies 2

Boosts 0

Participants 3

Anyone able to get custom StringInterpolations to work inside SwiftUI Text view?

extension String.StringInterpolation {
    mutating func appendInterpolation(justDate value: Date) {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        let dateString = formatter.string(from: value)
        appendLiteral(dateString)
    }
}


struct MyView: View {
    
    var body: some View {
        Text("Now: \(justDate: Date())"}) // Doesn't work
    }
    
    func test() {
        print("Now: \(justDate: Date())") // Works
    }
}

Boost

Answer 1

jlagrone OP

Nov ’20

I am having a similar problem with Xcode 12.2. My extension seem to work elsewhere, but not in Text views.

0

Answer 2

OOPer OP

Nov ’20

My extension seem to work elsewhere, but not in Text views.

In a usual context, String interpolation literals are handled by String.
But inside Text (when used as shown in OP), it is LocalizedStringKey, not String.

You may need to define another extension for LocalizedStringKey.

0