在自定义的UINavigationController中设置背景图片

//这个方法中设置

+ (void)initialize

{

    UINavigationBar *bar = [UINavigationBar appearance];

    [bar setBackgroundImage:[UIImage imageNamed:@"bg_navigationBar_normal"] forBarMetrics:UIBarMetricsDefault];

}

 

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

}

 

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}