Flutter 颤振-位置参数太多
我想将文档和用户对象传递到一个对话框中,该对话框编码在一个单独的文档中,可以对该用户的文档执行操作 传递信息的代码是:Flutter 颤振-位置参数太多,flutter,dart,arguments,Flutter,Dart,Arguments,我想将文档和用户对象传递到一个对话框中,该对话框编码在一个单独的文档中,可以对该用户的文档执行操作 传递信息的代码是: Widget _buildFunctionCards(BuildContext context, DocumentSnapshot document, FirebaseUser user) { return ListTile( title: GestureDetector( onTap: () {
Widget _buildFunctionCards(BuildContext context, DocumentSnapshot document, FirebaseUser user) {
return ListTile(
title: GestureDetector(
onTap: () {
showDialog(
context: context,
builder: (_) => FunctionEditOptions(document, user),
);},
child:Container... ()))}
接收文件的编码如下:
class FunctionEditOptions extends StatefulWidget {
FunctionEditOptions({this.db, this.user});
final FirebaseUser user;
final DocumentSnapshot db;
@override
State<StatefulWidget> createState() => FunctionEditOptionsState();
}
class FunctionEditOptionsState extends State<FunctionEditOptions>
with SingleTickerProviderStateMixin {
AnimationController controller;
Animation<double> scaleAnimation;
@override
class FunctionEditOptions扩展StatefulWidget{
FunctionEditOptions({this.db,this.user});
最终FirebaseUser用户;
最终文件数据库;
@凌驾
State createState()=>FunctionEditOptions状态();
}
类函数EditOptions状态扩展状态
使用SingleTickerProviderStateMixin{
动画控制器;
动画缩放;
@凌驾
收到的错误消息是:“位置参数太多:应为0,但找到2。”
如果有人能提供我的见解,我将不胜感激!改变这一点:
builder: (_) => FunctionEditOptions(document, user),
对此
builder: (_) => FunctionEditOptions(db: document, user: user), // or:
builder: (_) => FunctionEditOptions(user: user, db: document), // both ways are correct
当在括号内指定参数时,这些参数是可选的,并且可能不符合顺序。因此,在传递参数时必须命名参数
另一种方法是从括号中取出参数,并确保参数顺序正确
FunctionEditOptions(this.db, this.user);
这样说吧:
builder: (_) => FunctionEditOptions(document, user),
builder: (_) => FunctionEditOptions(document, user: user),
您可以将两者混合使用
FunctionEditOptions(this.db, {this.user});
这样说吧:
builder: (_) => FunctionEditOptions(document, user),
builder: (_) => FunctionEditOptions(document, user: user),