No console output from Xcode 11 / iOS 13

Question

My console is providing no output, no prints or system debug info on the right side and no variables on the left. I have both console windows open and I do have "All Output" selected. I have tried restarting Xcode and the machine itself but it doesn't seem to fix the issue. For the sake of debugging I am using Swift, I am unsure if this is related but it happened after enabling multiple windows but this may be a coincidence.

The issue is specific to each simulator as the only fix I have found is creating a new simulator but even this breaks after the first build and run.

Looking around I have seen this issue occur for others on Xcode 8 and adding the OS_ACTIVITY_MODE argument to the run scheme fixes it for those, I have tried and this does not work in this case. I suspect that this is Xcode 11 / iOS 13 specific as did not happen once on prior versions in my experience.

Are there any longterm fixes for this?

Answer 1

For XCode 11 users, not getting any output in their console, assuming that you have the console active (view > debug area > activate console), you'll have to right-click the live preview and select debug preview, as follows:

After that, you'll start getting output in your console!

The output above is the following source code, that you can create as a view let's say TestView.swift and copy/paste:

import SwiftUI

struct TestView: View {
    var body: some View {
        Button(action: { print("Hello world!") }) {
            Text("Click me!")
        }
    }
}

struct TestView_Previews: PreviewProvider {
    static var previews: some View {
        TestView()
    }
}