I'm trying to figure out a clean way to make a UIToolbar only as wide as it needs to be to fit the items t开发者_如何学Gohat it contains. Is there a way to either:

• Configure the UIToolbar to adjust its width automatically as its items are changed?
• Programatically determine the minimum width required by the items, which can then be used to set the UIToolbar's frame?

I haven't been able to figure this out due to the spacing between the items and the fact that UIBarButtonItems are not UIView subclasses.

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After trying some suggestions from other answers that did not work unless I used custom views, or unless everything was loaded, I finally arrived at a way to set the toolbar width based on its items:

//Add bar items to toolbar first.

UIView* v = toolbar.subviews.lastObject;
float newWidth = v.frame.origin.x + v.frame.size.width;

//Set toolbar width

You'll need to override UIToolbar -setItems: or otherwise detect changed buttons to autoresize.

I have included this feature in my refactoring library, es_ios_utils, to set a navigation item's right item with multiple buttons. In the preceding link, see UIToolbar +toolbarWithItems: and UINavigationItem -setRightBarButtonItems.

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I just checked the documentation and seems like UIBarButtonItems, even though they are not UIView subclasses, they have an attribute width. I didn't try it myself, but I think you could sum each item's width, including the flexible item, and get the width for your toolbar. Hope it helps! ;)

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Swift 3, 4 update

I have a toolbar with barButtonItem initiated with image. All I need to do is to calculate the total width of the images plus the intervals (margin.)

Margin is by default 11 in width. The code will be:

let width: CGFloat = YourBarButtonItemList.reduce(0) {sofar, new in
    if let image = new.image {
        return sofar + image.size.width + 11
    } else {
        return sofar + ADefaultValueIfThisDoesntWork + 11
    }
}