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# leftItemsSupplementBackButton

A Boolean value that indicates whether the left items display in addition to the Back button.

```
var leftItemsSupplementBackButton: Bool { get set }
```

## Discussion

Normally, the presence of custom left bar button items causes the Back button to be removed in favor of the custom items. Setting this property to <doc://com.apple.documentation/documentation/Swift/true> causes the items in the [`leftBarButtonItems`](/documentation/UIKit/UINavigationItem/leftBarButtonItems) or [`leftBarButtonItem`](/documentation/UIKit/UINavigationItem/leftBarButtonItem) property to be displayed to the right of the Back button — that is, they’re displayed in addition to, not instead of, the Back button. When set to <doc://com.apple.documentation/documentation/Swift/false>, the items in those properties are displayed instead of the Back button. The default value of this property is <doc://com.apple.documentation/documentation/Swift/false>.

The value in the [`hidesBackButton`](/documentation/UIKit/UINavigationItem/hidesBackButton) property still determines whether the Back button is actually displayed.

---

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