navigation bar rightbaritem image-button bug iOS 11

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Reason

The problem appears because from ios 11 UIBarButtonItem uses autolayout instead of dealing with frames.

Solution

You should add width constraint for this image-button if you use Xcode 9.

 button.widthAnchor.constraint(equalToConstant: 32.0).isActive = true
 button.heightAnchor.constraint(equalToConstant: 32.0).isActive = true

PS

button is not UIBarButtonItem, it is UIButton inside UIBarButtonItem. You should set constraint not for UIBarButtonItem, but for elements inside it.

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