- this是指當前對象
- this.widget是指當前組件
好比我有一個有狀態
的組件ShapeStep,在_ShapeStepState中的this.widget才能訪問到str屬性,而this訪問不到。
class ShapeStep extends StatefulWidget {
final String str;
const ShapeStep({Key key, this.autologousPreparation}) : super(key: key);
@override
_ShapeStepState createState() => _ShapeStepState();
}
class _ShapeStepState extends State<ShapeStep> {
@override
void dispose() { // 聲明周期函數——銷燬時執行的方法
print("aaa " + this.toString());
print("bbb " + this.widget.toString());
print("是否同樣 " + (this == this.widget).toString()); // false
this.widget.str= '張大哥';
print("ShapeStep被銷燬");
super.dispose();
}
// 省略build方法
}