Flutter 中 使用 SingleTickerProviderStateMixin 出现的问题

在使用 TabBar 时出现以下问题：
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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.

缘由是； 屡次调用了 TabController()
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解决方案：将其 SingleTickerProviderStateMixin 改为 TickerProviderStateMixin 便可。

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