自定义 NavigationController

/**
 *  设置UINavigationBarTheme的主题
 */
+ (void)setupNavigationBarTheme
{
    UINavigationBar *appearance = [UINavigationBar appearance];
    
    // 设置导航栏背景
    if (!iOS7) {
        [appearance setBackgroundImage:[UIImage imageWithName:@"navigationbar_background"] forBarMetrics:UIBarMetricsDefault];
    }
    
    // 设置文字属性
    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
    textAttrs[UITextAttributeTextColor] = [UIColor blackColor];
    // UITextAttributeFont  --> NSFontAttributeName(iOS7)
#warning 过期 : 并不代表不能用, 仅仅是有最新的方案可以取代它
    textAttrs[UITextAttributeFont] = HMNavigationTitleFont;
    // UIOffsetZero是结构体, 只要包装成NSValue对象, 才能放进字典\数组中
    textAttrs[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
    [appearance setTitleTextAttributes:textAttrs];
}
/**
 *  设置UIBarButtonItem的主题
 */
+ (void)setupBarButtonItemTheme
{
    // 通过appearance对象能修改整个项目中所有UIBarButtonItem的样式
    UIBarButtonItem *appearance = [UIBarButtonItem appearance];
    
    /**设置文字属性**/
    // 设置普通状态的文字属性
    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
    textAttrs[UITextAttributeTextColor] = [UIColor orangeColor];
    textAttrs[UITextAttributeFont] = [UIFont systemFontOfSize:15];
    textAttrs[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
    [appearance setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
    
    // 设置高亮状态的文字属性
    NSMutableDictionary *highTextAttrs = [NSMutableDictionary dictionaryWithDictionary:textAttrs];
    highTextAttrs[UITextAttributeTextColor] = [UIColor redColor];
    [appearance setTitleTextAttributes:highTextAttrs forState:UIControlStateHighlighted];
    
    // 设置不可用状态(disable)的文字属性
    NSMutableDictionary *disableTextAttrs = [NSMutableDictionary dictionaryWithDictionary:textAttrs];
    disableTextAttrs[UITextAttributeTextColor] = [UIColor lightGrayColor];
    [appearance setTitleTextAttributes:disableTextAttrs forState:UIControlStateDisabled];
    
    /**设置背景**/
    // 技巧: 为了让某个按钮的背景消失, 可以设置一张完全透明的背景图片
    [appearance setBackgroundImage:[UIImage imageWithName:@"navigationbar_button_background"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
}

/**
 *  能拦截所有push进来的子控制器
 */
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.viewControllers.count > 0) { // 如果现在push的不是栈底控制器(最先push进来的那个控制器)
        viewController.hidesBottomBarWhenPushed = YES;
        
        // 设置导航栏按钮
        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem itemWithImageName:@"navigationbar_back" highImageName:@"navigationbar_back_highlighted" target:self action:@selector(back)];
        viewController.navigationItem.rightBarButtonItem = [UIBarButtonItem itemWithImageName:@"navigationbar_more" highImageName:@"navigationbar_more_highlighted" target:self action:@selector(more)];
    }
    [super pushViewController:viewController animated:animated];
}