Flutter 中 使用 SingleTickerProviderStateMixin 出現的問題

在使用 TabBar 時出現以下問題：
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flutter: _TravelPageState is a SingleTickerProviderStateMixin but multiple tickers were created. A SingleTickerProviderStateMixin can only be used as a TickerProvider once. If a State is used for multiple AnimationController objects, or if it is passed to other objects and those objects might use it more than one time in total, then instead of mixing in a SingleTickerProviderStateMixin, use a regular TickerProviderStateMixin.

緣由是； 屢次調用了 TabController()
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解決方案：將其 SingleTickerProviderStateMixin 改爲 TickerProviderStateMixin 便可。

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