Use Custom Back Button in NavigationBar

 Use Following code in -(void)viewDidLoad {}

UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];


[btn setBackgroundImage:[UIImage imageNamed:@"btnImg.png"] forState:UIControlStateNormal];

 [btn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

 btn.frame=CGRectMake(3, 2, 53, 30);

 UIBarButtonItem *btnBack=[[UIBarButtonItem alloc] initWithCustomView:btn];

 self.navigationItem.leftBarButtonItem=btnBack;

 [btnBack release];