如何在IOS中重新加载UIBarButtonItem

Question

My app is like a shopping cart. I have added one cart UIBarButtonItem in navigation bar.
In cart button I have added a badge at top.
Now my question is when I add an Item on cart How to update badge on button without navigation or when I delete an item from cart badge would be update.
Is it possible to reload navigation bar without navigation?

Answer 1

I just Update my badge when I want to reload. For eg when I delete any product from cart I reinitialise the bar button item. Here, is my code:

  NSMutableArray *arrProducts = [[notification userInfo] objectForKey:@"CartList"]; [[NSUserDefaults standardUserDefaults] setInteger:[arrProducts count] forKey:@"Badge"]; [[NSUserDefaults standardUserDefaults] synchronize]; UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; UIImage *backButtonImage = [UIImage imageNamed:@"shopping_cart.png"]; [button setBackgroundImage:backButtonImage forState:UIControlStateNormal]; // add badge to cart button. [CommonUtils AddBadge:button]; [button addTarget:self action:@selector(AddToCartClicked:) forControlEvents:UIControlEventTouchUpInside]; button.frame = CGRectMake(0, 0, 30, 30); [btnAddtoCart initWithCustomView:button]; 

Answer 2

Check condition and show/hide badge accordingly.

First, you have to hide badge. When any item is selected check count of item selected is greater than 0 then show badge.

Every time any item selected show badge.

Every time any item deselected check if selected item == 0 then hide badge.