UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 88)];
UIImage *img = [UIImage imageNamed:@"top_bar.png"];
[imgView setImage:img];
[self.view addSubview:imgView];

UIButton *navigationButton = [UIButton buttonWithType:UIButtonTypeCustom];
[navigationButton setImage: [UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
[navigationButton addTarget:view action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
navigationButton.frame = CGRectMake(-2, 23, 75, 55);
[self.view addSubview:navigationButton];

If your user interface is complex or less than very good, it may be rejected