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# backButtonBackgroundImage(for:barMetrics:)

Returns the back button background image for a specified control state and bar metrics.

```
func backButtonBackgroundImage(for state: UIControl.State, barMetrics: UIBarMetrics) -> UIImage?
```

## Parameters

`state`

A control state.

`barMetrics`

Bar metrics.

## Return Value

The back button background image for `state` and `barMetrics`.

## Discussion

This modifier applies only to navigation bar back buttons and is ignored by other buttons.

---

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