如何测试工具栏中的项目是否为 FlexibleSpace 项目？

Question

我想知道UIBarButtonItem枚举的self.toolbarItems是按钮，哪个是灵活的空间项。

Answer 1

As A-Live confirmed my findings that one is not able to query the UIBarButtonItem to check if it is FlexibleSpace (or FixedSpace) I've used tag to mark those items as flexible and fixed space (2 different integers) and put those numbers in the constant then in code I use:

for(int i=0; i<self.toolbarItems.count; i++)
{
    if(item.tag != TOOLBAR_FIXED_SPACE_TAG && 
       item.tag != TOOLBAR_FLEXIBLE_SPACE_TAG)
    {
        //count real button:)
    }
}

Answer 2

The answer above I wasn't able to get to actually work, so I used this. Hopefully this can help someone:

 for(int i=0; i<[buttonArray count]; i++){
      UIBarButtonItem *buttonItem = [[self items] objectAtIndex:i];
      if(buttonItem.title){
           NSLog(@"Double Boom %@", buttonItem);
      }
 }

** Flexible/Fixed space doesn't contain a title... This is the only real difference I could immediately see. So, I am literally just checking for a title.

Answer 3

Dirty Swift 5.0 solution:

let fixedSpaces = toolbarItems?.filter({ $0.description.contains("systemItem=FixedSpace") })

It may break over time but will suffice for debug purposes.

Apply hand sanitizer after each use.