How to fix the Core Data / SwiftUI 2.0 template in Xcode 12

Question

In Xcode 12, does the CoreData / SwiftUI 2.0 template give you an app that only displays a white screen? Well...

In ContentView, replace the body with this...

Code Block swiftvar body: some View {
	NavigationView {
		List {
			ForEach(items) { item in
				Text("Item at \(item.timestamp!, formatter: itemFormatter)")
			}
			.onDelete(perform: deleteItems)
		}
		.toolbar {
			ToolbarItem(placement: .navigationBarLeading) {
				#if os(iOS)
				EditButton()
				#endif
			}
			ToolbarItem(placement: .navigationBarTrailing) {
				Button(action: addItem) {
					Label("Add Item", systemImage: "plus")
				}
			}
		}
	}
}

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Posted by

SRiggs

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Answer 1

Nice suggestion! Thanks for posting.

The template in Xcode 12.2 beta produces a blank white screen on iOS

Posted by

davidcc

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Answer 2

Still an issue in the public release...

Posted by

ShunnyBunny

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Answer 3

I've fixed this for Xcode 12.3 default CoreData code.
Answered here :https://stackoverflow.com/a/65315807/1890317

Posted by

Ged

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Answer 4

Hi there,

If you add a new navigation view and a new horizontal stack view in the body then you can solve the blank screen issue with an ease.

Here goes the code:

Code Block swiftvar body: some View {
        NavigationView { // NEW
            List {
                ForEach(items) { item in
                    Text("Item at \(item.timestamp!, formatter: itemFormatter)")
                }
                .onDelete(perform: deleteItems)
            }
            .toolbar {
                HStack { // NEW
                  #if os(iOS)
                    EditButton()
                  #endif
                  Button(action: addItem) {
                      Label("Add Item", systemImage: "plus")
                  }
              } //: HSTACK
          }
      } //: NAVIGATION
}

This can fix this problem until engineers in Cupertino updates this Core Data template.

Until then happy coding!

Posted by

Robert Petras

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How to fix the Core Data / SwiftUI 2.0 template in Xcode 12

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