Make struct init() parameter accept two types?

November 4, 2021

I believe this would be generics but I am unsure of how to implement it. I have a simple struct for defining a button on my app. I want to be able to either pass directly in an Image() or compose an image with Image(systemName: String) if a user passes in a String.

import SwiftUI

public struct TextFieldStepperButton {
    let image: Image
    let color: Color
   
    // image: Image should accept both (String && Image)
    public init(image: Image, color: Color = Color.accentColor) {
        // Detect if image == String || Image then define it depending on result
        self.image = image
        self.color = color
    }
}

Is there a way to do this?

>Solution :

This isn’t a problem of generics; you just need two inits.

public init(image: Image, color: Color = Color.accentColor) {
    self.image = image
    self.color = color
}

// And then add a convenience that calls the other:

public init(imageNamed: String, color: Color = Color.accentColor) {
    self.init(image: Image(systemName: imageNamed), color: color)
}

I would recommend having different parameter names (image vs imageNamed), but you could unify them and use image for both if you like.