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const BottomTabs = TabNavigator(    {        Combined: {            screen: Combined,            path: 'combined',        },        Trend: {            screen: Trend,            path: 'trend',        },        Scans: {            screen: Scans,            path: 'scans',        },        Products: {            screen: Products,            path: 'products',        },    },    {        tabBarOptions: {            activeTintColor: Platform.OS === 'ios' ? '#2d5b8a' : '#000',        },        animationEnabled: false,        swipeEnabled: true,        tabBarPosition: 'bottom', //--->看这里    });

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