如何使以编程方式创建的leftBarButtonItem可见并设置backgroundimage

Question

Below code is working fine in my application. But that leftbarbuttonitem is invisible. And I can't set background image to leftBarButtonItem . I did some thing wrong, but I don't know what is the mistake? Is it possible to make visible and set background image?

UIImageView *NavigationBarImage =[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 44)];
NavigationBarImage.image=[UIImage imageNamed:@"mapbutton.png"];
[self.navigationController.navigationBar addSubview:NavigationBarImage];
self.navigationItem.hidesBackButton = YES;

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonItemStyleBordered target:self action:@selector(goBack)];
self.navigationItem.leftBarButtonItem = backButton;

-(void)goBack
{
    [self.navigationController popViewControllerAnimated:YES];
}

Answer 1

If you want to add a backgroundImage to your navigation item you have to add a custom button, like bellow:

UIButton *tempButton                            =       [UIButton buttonWithType:UIButtonTypeCustom];
tempButton.frame                                =       CGRectMake(0, 0, 50, 30);
tempButton.showsTouchWhenHighlighted            =       YES;
tempButton.backgroundColor                      =       [UIColor clearColor];
[tempButton setBackgroundImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
[tempButton setTitle:@"Back" forState:UIControlStateNormal];
[tempButton addTarget:self action:@selector(goBack) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *backBtn                        =         [[UIBarButtonItem alloc]initWithCustomView:tempButton];

self.navigationItem.leftBarButtonItem           =       backBtn;

And to add a background Image to navigation bar you can use the following code

 [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"header.png"] forBarMetrics:UIBarMetricsDefault];

Answer 2

UIButton *home = [UIButton buttonWithType:UIButtonTypeCustom];  
UIImage *homeImage = [UIImage imageNamed:@"YOUR_IMAGE.png"];  
[home setBackgroundImage:homeImage forState:UIControlStateNormal];  
[home addTarget:self action:@selector(your_Action)  
forControlEvents:UIControlEventTouchUpInside];  
home.frame = CGRectMake(0, 0, 69, 26);  
UIBarButtonItem *button2 = [[UIBarButtonItem alloc] initWithCustomView:home];
[[self navigationItem] setLeftBarButtonItem:button2];
[button2 release];
button2 = nil;