存档
11月 2021
显示总共32条中的前3条
Flutter Error Null check operator used on a null value
发布者 : 粮油菜大市场 发布时间 : 25 Nov 2021 09:26:43
Flutter Error Null check operator used on a null value
flutter error A ProductProvider was used after being disposed.
发布者 : 粮油菜大市场 发布时间 : 25 Nov 2021 07:04:55
A ProductProvider was used after being disposed.
可能是 provider的一个子节点，已经声明过父节点了，改成value的形式
ChangeNotifierProvider.value(
value: ProductProvider.instance(false)),
There should be exactly one item with [DropdownButton]'s value: disabled
发布者 : 粮油菜大市场 发布时间 : 25 Nov 2021 07:02:45
There should be exactly one item with [DropdownButton]'s value: disabled.
Either zero or 2 or more [DropdownMenuItem]s were detected with the same value
'package:flutter/src/material/dropdown.dart':
package:flutter/…/material/dropdown.dart:1