1.问题:The argument type 'MyState' can't be assigned to the parameter type 'TickerProvider'.
方案:在State类的末尾添加 with TickerProviderStateMixin
1.问题:The argument type 'MyState' can't be assigned to the parameter type 'TickerProvider'.
方案:在State类的末尾添加 with TickerProviderStateMixin
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