itemPositioning enum('fill', 'center', 'auto')
Specifies tab bar item positioning. Available values are: - fill - distributes items across the entire width of the tab bar - center - centers item in the available tab bar space - auto (default) - distributes items dynamically according to the user interface idiom. In a horizontally compact environment (e.g. iPhone 5) this value defaults to fill, in a horizontally regular one (e.g. iPad) it defaults to center.
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