SwiftUI Alignment Guide Bug

For the last few years SwiftUI’s alignment guides have been broken in combination with if-statements. Here’s a small example:

struct ContentView: View {
    var body: some View {
        Color.green
            .frame(width: 100, height: 100)
            .overlay(alignment: .topLeading) {
                if true {
                    Circle()
                        .alignmentGuide(.leading) { $0.width/2 }
                }
            }
    }
}

I expected the horizontal center of the circle to be aligned with the leading edge of the green color. Instead, both views are centered on top of each other. When you remove the if it works as expected. If you replace the if with an if/else or a switch it’s still broken.

To fix this (depending on your use case) you can replace the if statement with an opacity modifier or something similar.

(FB13676056 for Apple folks. Last tested on Xcode 27).