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Instead of `flexGrow`, `TabBarBottom` should use `flex` in order to match iOS HIG for UITabBar. Otherwise, if labels with different length are set, the layout of the tab bar isn't consistent with what iOS users expect (tab highlighted with red border):  After the change, this is how the tab bar looks: <img width="429" alt="screen shot 2017-02-27 at 15 14 35" src="https://cloud.githubusercontent.com/assets/289640/23364470/7f652e76-fcff-11e6-9e84-8a0efa7d9c5d.png">