英文:
How to conditionally assign a value to Flutter List
问题
如何根据recipeList的值有条件地为"ingList"赋值？
class Calculator extends StatefulWidget {
List<IngredientList> recipeList;
Calculator(this.recipeList, {Key? key}) : super(key: key);
@override
State<Calculator> createState() => _CalculatorState();
}
class _CalculatorState extends State<Calculator> {
List<IngredientList> ingList = [];
这段代码中，根据recipeList的值，有条件地为"ingList"赋值。
英文:
How to conditionally assign a value to "ingList" based on the value of recipeList?
class Calculator extends StatefulWidget {
List<IngredientList> recipeList;
Calculator(this.recipeList, {Key? key}) : super(key: key);
@override
State<Calculator> createState() => _CalculatorState();
}
class _CalculatorState extends State<Calculator> {
List<IngredientList> ingList = [];
答案1
得分: 1
你可以使用 initState 来实现这个功能。
英文:
You can use initState to do that
class Calculator extends StatefulWidget {
List<IngredientList> recipeList;
Calculator(this.recipeList, {Key? key}) : super(key: key);
@override
State<Calculator> createState() => _CalculatorState();
}
class _CalculatorState extends State<Calculator> {
List<IngredientList> ingList = [];
@override
void initState() {
super.initState();
ingList = widget.recipeList; // you can do any condition here
}
}
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