ios - shadow in navigationbar when pushing -

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please help. when pushing view controller navigation bar shadow. there way remove shadow, please?

i used push/pop animations yes. tried 

[uiview animatewithduration:1.2               animations:^{                  self.view.frame = cgrectmake(320, 0, 320, 480);  }];

but nothing.

thank you.

there tone of ways modify navigation bar appearance, can see examples here: www.appcoda.com/customize-navigation-status-bar-ios-7

in particular case, can set empty image navigation bar shadow image:

[uinavigationbar appearance].shadowimage = [uiimage new];

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