flutter

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flutter

flutter 生命周期

flutter 生命周期 🔗 createState(): When the Framework is instructed to build a StatefulWidget, it immediately calls createState() mounted is true: When createState creates your state class, a buildContext is assigned to that state. buildContext is, overly simplified, the place in the widget tree in which this widget is placed. Here’s a longer explanation. All widgets have a bool this.mounted property. It is turned true when the buildContext

flutter
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flutter

flutter 问题整理

Undefined name ‘OutlineButton’. 🔗使用TextButton代替 Try adding either an explicit non-’null’ default value or the ‘required’ modifier. 🔗空安全报错，一旦sdk升级到2.12以上之后，那么就会执行空安全检查 添加关键字

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