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in Technique[技术] by (71.8m points)

setState的使用疑问

以下setState的使用方法:
setState(() {
_stateValue = 1;
});
和下面的使用方法:
_stateValue = 1;
setState((){});
实际上是等效的,那么问题来了:这两种方法有何区别?没有区别的话,setState的函数参数fn有什么用呢?完全可以去掉啊,调用起来还简单明了:
_stateValue = 1;
setState();


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