the navigationBarTitle string var I was using was not private , I make it private, and now the navigationBarTitle don't pass to the root view, when I am not using the timer. Now im fighting with a countodown timer I have as a navigationBarItems trailing, and that one is getting fuzzy, and all the bar appears on the root view. thanks

I don't know how to edit the question again, sorry. The private var resolution was a false alarm, the counter is the problem, when I do the left-edge,i see more of the root vies, the counter immediately stops, and if I stays on the destination view then timer becomes blurry, and if I tap on < Back, the root view appears with the navigationBar of the destination view. If I go all the way to the right, the root view appears fine, without the destination view bar. it only happens when the timer is working .

I don't know how to edit the question again, sorry again. when I begin the left-edge scrolling, that I see the root view, the navigationBarItems(trailing), stop to upgrade the counter, but the timer continue working, (I print my var onBarRighTitle, and continue upgrading), when I stop the scrolling and stay in the destination view, the text receive again the output, and becomes blurry.

import SwiftUI struct ContentView: View {     var body: some View {         NavigationView {             NavigationLink(destination: SecondCounter()){                 Text("Show Second Counter View")}                 .navigationBarTitle("RootView")         }     }     struct SecondCounter : View {         @State var timer: Timer? = nil         @State private var secCounter = 0                var body: some View {             Text("")                 .navigationBarTitle("Second Counter View" ,displayMode:.inline)                 .navigationBarItems(trailing:Text("\(secCounter)"))                 .onAppear {                     self.secondCounter()                 }             .onDisappear {                 self.timer?.invalidate()                 self.timer = nil             }         }         func secondCounter () {             timer =  Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { _ in                 self.secCounter += 1             })         }     }     struct ContentView_Previews: PreviewProvider {         static var previews: some View {             ContentView()         }     } } this is the whole program where I get the errors

Resolved !!!! I use .toolbar IOS 14, and now the problem is not happening. I'm very happy Your total silence did not help with this question, but I hope somebody, somewhere learned something from it.

Same issue with Xcode 13.2.1, I downloaded from the Application Store, I downloaded from the Developers website, the same error, I cannot enter info on a TextField in Preview, the cursor appear, I can paste, but not enter data from the keyboard. I can enter data when I run the sample in my phone.

I got this answer from : Ioannis Diamantidis - How to fix Xcode Playground getting stuck on "Running". I am using Xcode version 13.2.1 with a Mac Mini M1. I went to the playground icon on the top right corner - Hide or show the Inspectors, it says Playground Settings , I select in Platform macOs. now my playground is running perfect, I see the results everywhere

Same problem with Mac Mini M1 , and Xcode 13.2.1(13C100)

The same problem happens to me for a long time, I submitted an issue, and Apple recommend to download Xcode 13.3.1, and macOs 12.4 Beta, now is working perfect, I can enter values with the physical keyboard in any TextField preview. I don't know if downloading only Xcode 13.3.1 will resolve the problem, I had before 13.2.1 I think