iOS Navigation自定义设置Item

@interface CustomNavigationController : UINavigationController

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
// 判断Push进来的控制器是否根控制器
if (self.childViewControllers.count > 0)
{
// Push时隐藏TabBarBottom(应用层级结构为TabBarController -> NavigationController时)
viewController.hidesBottomBarWhenPushed = YES;

// 添加左边Item到navigationItem
viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem itemWithTarget:self image:@“leftBarButtonImage" highlightedImage:@"leftBarButtonImage_highlighted" action:@selector(clickLeftItem)];

// 添加左边Item到navigationItem
viewController.navigationItem.rightBarButtonItem = [UIBarButtonItem itemWithTarget:self image:@“rightBarButtonImage" highlightedImage:@“rightBarButtonImage_highlighted" action:@selector(clickRightItem)];
}

[super pushViewController:viewController animated:YES];
}

- (void)clickLeftItem
{
// Method
[self popViewControllerAnimated:YES];
}

- (void)clickLeftItem
{
// Method
}

+ (UIBarButtonItem *)itemWithTarget:(id)target image:(NSString *)imageName highlightedImage:(NSString *)highlightedImageName action:(SEL)action
{
// 创建按钮
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
// 设置按钮图片
[button setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:highlightedImageName] forState:UIControlStateHighlighted];
// 设置按钮尺寸
button.size = button.currentImage.size; // 避免图片拉伸
// 设置按钮监听事件
[button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

// 返回Item
return [[UIBarButtonItem alloc] initWithCustomView:button];
}