gistfile1.txt

UIImage *backButtonImage = [UIImage imageNamed:@"left"];
[backButtonImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIButton *backBarButton = [UIButton buttonWithType:UIButtonTypeCustom];
backBarButton.frame = CGRectMake(0.0f, 0.0f, backButtonImage.size.width, backButtonImage.size.height);
//[backBarButton setBackgroundImage:backButtonImage forState:UIControlStateNormal];
[backBarButton setImage:backButtonImage forState:UIControlStateNormal];
[backBarButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
backBarButton.layer.borderColor = [[UIColor whiteColor] CGColor];
backBarButton.layer.borderWidth = 1.0f;
backBarButton.tintColor = [UIColor whiteColor];
UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backBarButton];
self.navigationItem.leftBarButtonItem = backBarButtonItem;