ios - UINavigationBar: wrong animation with AutoLayout if BackgroundImage is set -

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i have uinavigationcontroller within container. container has leading-constraint. want animate leading-constraint shrink navigationcontroller-view display additional stuff.

this working fine long backgroundimage not set. if set custom backgroundimage uiappearance, navigationbar doesn't animate size-change backgroundimage. ios7 working fine.

how can fix ios6?

project: https://bitbucket.org/arturfriesen/navigationbartest


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