考资料:
Flutter之BuilderContext和Widget关系浅析
Flutter之Widget更新机制简单分析
Fultter之Element和Widget对应关系解析
Flutter之实战InheritedWidget详解
Widget _createButton() {
return Builder(builder: (context) {
转载:https://blog.csdn.net/chunqiuwei/article/details/103791010
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