LaTeX view not updating when string input updated

[Léo G.]

Title is self explanatory. Take this code for example:

import SwiftUI
import LaTeXSwiftUI

struct TestView: View {
    @State var varLatex = "$a$"
    
    var body: some View {
        VStack {
            Text(varLatex)
            LaTeX(varLatex)
            Button("Switch") {
                varLatex = "$b$"
            }
        }
    }
}

#Preview {
    TestView()
}

When the button is clicked, varLatex is updated and so is the Text view. But the LaTeX view is not updated... I have tried on multiple examples: whenever the input is updated, the view does not. And there is no workaround...

It feels like the LaTeX only works with constant strings, since iterating with ForEach over a constant list of strings works perfectly.

My knowledge in Swift is too little for me to open a PR... I hope this can be fixed soon!

[Vladimir (Alkenso)]

have same issue. Fix is highly demanded and appreciated

[lcs-rgordon]

Same experience here.

However, @colinc86 I've figured out that this problem was introduced at some point after version 1.1.0 based on my having created a project in early June 2023 that used LaTeXSwiftUI, and having everything work as expected.

For example, the code below works with version 1.1.0:

import SwiftUI
import LaTeXSwiftUI

struct ContentView: View {
    
    @State var radius = 0.0
    
    var body: some View {
        VStack {
            Text("\(radius)")
            Slider(value: $radius, in: 0...100)
            LaTeX("$$A=\\pi ^2$$")
            LaTeX("$$A=\\pi (\(radius))^2$$")
        }
        .padding()
    }
}

With the latest version, 1.3.0, when you drag the slider, the view is not updated.

I hope this helps. Thank-you for developing this package – it's really useful for myself as a Computer Science and Mathematics teacher, and, for my students.

[lcs-rgordon]

Follow-up: it is version 1.2.3 where the code in my comment above breaks. Any version lower than that and the LaTeX view updates as expected.

[electrocampbell]

The past few months have been very busy for me, so I apologize for not keeping up with this as much as I would have liked. I've updated the package to version 1.3.1, and it should work now with the examples you all have provided (which I very much appreciate). Thank you for the feedback!

[lcs-rgordon]

Completely understand about being busy – no need to apologize. Can confirm on my end as well that 1.3.1 works as expected, trying out the example I provided earlier. My students and I very much appreciate your efforts to build and maintain this package. Thanks!

[Léo G.]

No need to apologise indeed, thank you for this great package!