"首页添加至购物车,TabBar显示购物车的数量"实现

// 接受通知
- (void)addNotification{
    [AJNotification addObserver:self selector:@selector(IncreaseShoppingCart) name:LFBShopCarBuyNumberDidChangeNotification object:nil];
}

// 接收通知的操作
- (void)IncreaseShoppingCart{
    UIViewController *shoppingVC = self.childViewControllers[2];
    NSInteger shoppingIndex = [[AJUserShopCarTool sharedInstance]getShopCarGoodsNumber];
    if (shoppingIndex == 0) {
        shoppingVC.tabBarItem.badgeValue = nil;
        return;
    }
    shoppingVC.tabBarItem.badgeValue = [NSString stringWithFormat:@"%zd",shoppingIndex];
}

// 注销通知
- (void)dealloc{
    [AJNotification removeObserver:self];
}