hii,,

   This is some code for 


self.navigationController.navigationBar.translucent = YES;
self.navigationController.navigationBar.tintColor = [UIColor blackColor];
And to make your statusbar translucent.

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent animated:YES]; 
[self setWantsFullScreenLayout:YES];

use this code and build and run to get Transparent NavgationBar..