问题
As you can see from the screenshot, the View button text is aligned properly under Allowed Toolbar Items, but once I add it to the toolbar, it's aligned to the right. Why?
回答1:
You have to set sane minimum and maximum sizes for the toolbar item. I think you also have to make sure the autoresize masks (or constraints if you're using automatic layout) are set properly in the toolbar item's view (the NSSegmentedControl in this case). I don't have the "proper" settings handy but the min/max toolbar item size + correct autosizing behavior are the key here.
来源：https://stackoverflow.com/questions/8280710/cant-align-label-on-a-segmented-control-in-an-nstoolbar