ios7 - iOS 7.1 UINavigationBar backgroundImage behaviour -

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is there specific documentation uinavigationbar backgroundimage ios 7.1? becuase behave differently ios 7.

what want achieve , achieved on ios 7.

what want achieve

this achieved putting uiimage on uinavigatioinbar using [[uinavigationbar appearance] setbackgroundimage:img forbarmetrics:uibarmetricsdefault];

but when on ios 7.1, changed screenshoot

appearance on ios 7.1

ios < 7 , ios 7 positioning works using delta. on ios 7, changed , ui broken. because on ios 7.1, uinavigationbar seems opaque when set backgroundimage. how make uinavigationbar become translucent in ios 7? don't need more position adjustment each ios version.

self.navigationcontroller.navigationbar.translucent = yes;

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