As seen below, my image is being cropped, yet there appears to be enough space to render it. As well, the image seems to be at the top.
I have no title set so want no text there. How can I get the button to center and fit the image?

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You can’t. Either reconsider putting text there (images are almost never entirely self explaining, the are mostly usefull as visual mnemonic). Or you have to implement the tab bar yourself.