SOLVED: Problem getting a string from a func

@happyidiottalk

Feb 3

I am having an issue with an error that I don't understand. I have a class that extracts some data from a binary file, and I want to return a string back to my view so I can present it. The relevant bit of my view code is:

struct ContentView: View {

@State var myString = ""

var body: some View {
    VStack {

        let bfr: BinFileReader = BinFileReader()
        myString = bfr.getMyString()                       //THIS IS WHERE I GET THE ERROR
        ....

    }
    .padding()
}

}

and in my Binary File reader class I have:

func getMyString() -> String {

    print("Number of elements in binData is: \(binData.count)")
    let MyString_Data = binData[17...32]
    let string = String(decoding: MyString_Data, as: UTF8.self)
    print(string)
    return string
}

and the error I get is: 'buildExpression' is unavailable: this expression does not conform to 'View'

I'm confused by the error - what does it mean and how can I fix it?

@NigelGee HWS+

Feb 3

You can not have myString = bfr.getMyString() in the body.

Is the Binary File reader class an @Observable, if so

@State var bfr = BinFileReader()

var body: some View {
    VStack {

        Text(bfr.getMyString())
        ....

    }
    .padding()
}

Not sure what you are doing with myString

You get that error because body is a @ViewBuilder so that it conform to View

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