UINavigationBar*bar=[self.navigationController navigationBar];
CGFloatnavBarHeight=35.0f;
CGRectframe=CGRectMake(0.0f,20.0f,320.0f,navBarHeight);
[bar setFrame:frame];
UINavigationBar*bar=[self.navigationController navigationBar];
CGFloatnavBarHeight=35.0f;
CGRectframe=CGRectMake(0.0f,20.0f,320.0f,navBarHeight);
[bar setFrame:frame];