Conditionally apply overlay in SwiftUI

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In SwiftUI, the .overlay() modifier allows you to add subviews over other views, creating layered compositions. You can conditionally apply overlays based on certain conditions using various approaches.

Nil Value for No Change:

Most modifiers in SwiftUI, including .overlay(), accept nil as a value to indicate "no change." This means you can write conditional overlays like:

.overlay(views > 1 ? Button(action: { ... }, label: { ... }) : nil)

This overlay will only be applied if the views variable is greater than 1.

Extracting the Button to a View Struct:

To improve readability, you can extract the button to a separate view struct. This makes the code more organized and easier to maintain:

struct MyButton: View {
    var body: some View {
        Button(action: { ... }, label: { ... })
    }
}

.overlay(views > 1 ? MyButton() : nil)

Using Curly Braces:

Another way to conditionally apply overlays is to use curly braces with an if statement:

.overlay {
    if user.isVerified {
        Image(systemName: "checkmark.circle.fill")
    }
}

This overlay will only be applied if the user.isVerified condition is true.

Remember that the .overlay() modifier allows you to stack multiple overlays on top of each other. This provides flexibility in creating complex and dynamic user interfaces.

```