I am using SF Symbols images as tab images in my iOS app by assigning them as follows:
self.tabBarItem.image = UIImage(systemName: "ellipsis")
This results in all images being top-aligned, but I would like to have them centered vertically.
What do I have to do for this?
Apparently SF symbols are rendered with system font size by default. So if you add a baseline offset of half that size to the ellipsis symbol you could almost perfectly center it vertically that way.
It's only almost perfect because ellipsis symbol has a height of its own which is not accounted for by this solution, even if it is not much.
self.tabBarItem.image = UIImage(systemName: "ellipsis")!.withBaselineOffset(fromBottom: UIFont.systemFontSize / 2)
The best solution, which will make your button identical to "tabBarSystemItem: .more", but with the possibility of removing the title and applying Configuration is the following:
self.tabBarItem.image = UIImage(systemName: "ellipsis", withConfiguration:
UIImage.SymbolConfiguration(weight: .black))!.imageWithoutBaseline()
You have to set the image insets on the UITabBarItem to shift your icons down 6 or 7px (depending on your icon size).
I've done this by creating a subclass of UITabBarController and adding this code to the bottom of my viewDidLoad method:
tabBar.items?.forEach({
$0.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)
})
(You could also do this in your ViewController classes, if that's where you configure each of their tab bar items.)
You can also do it using storyboards by selecting your TabBarItem in the storyboard and adjusting the insets in the info panel:
