我正在计算用户的刷卡次数,当它在控制台中打印出来时,它确实会被计算在内,但在刷卡后,我得到了这个错误:-
[ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: setState() called after dispose(): _HomeState#990d2(lifecycle state: defunct, not mounted, ticker inactive)
This error happens if you call setState() on a State object for a wid
我为一个动画按钮复制粘贴的代码,该按钮在向动画控制器添加侦听器时调用setState。 这篇文章的答案是: (Article) Flutter Laggy Animations: How Not To setState (SO answer) Flutter animation not working 声明在这种情况下不建议调用setState,因为它将在每次按下按钮时重新构建整个UI。合乎道理! 现在,当我使用AnimatedBuilder时,它会停止工作。我做错了什么? 代码: class _AnimatedButtonState extends State<AnimatedBut
我正在为我的应用做注册页面,我已经设置它为每个TextFormField有焦点节点,这样用户就可以点击键盘上的next按钮来聚焦下一个字段。问题是,当页面加载时,它会聚焦在底部字段上,即使我将顶部的"name“字段设置为自动焦点。
我甚至尝试在onInit中请求焦点,我已经厌倦了在构建部分的顶部。
class _SignUpScreenState extends State<SignUpScreen> {
final _signUpFormKey = GlobalKey<FormState>();
final TextEditingController
我试图使用setState更改变量的值,但是它给了我这个错误
Unhandled Exception: setState() called after dispose(): _SplashState#27d6e(lifecycle state: defunct, not mounted, ticker inactive)
E/flutter (12289): This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g
它显示了这个错误。 E/flutter (22343): This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callba
在单击“注册”页面上的“注册”按钮后,我试图实现加载栏,然后得到了此错误,无法在单击按钮后找到显示加载栏的方法
错误:
[ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: setState() called after dispose(): _AdminRegisterState#f3c8f(lifecycle state: defunct, not mounted)
E/flutter (29660): This error happens if you call setState() on a State o
试图在颤振中使用,我有以下问题:
当导航应该弹出回Widget Nr1时,我不能再在Widget Nr1中调用setState()。这是因为dispose()方法一旦从WidgetNR1到Widget-Nr2的Navigation.push被调用。
事实证明,为了使dispose()插件正确工作,我绝对需要调用这个image_picker方法。(如果我不这样做,那么错误...was disposed with an active Ticker...就会发生,可能是因为image_picker插件在引擎盖下做了一些非常需要预先处置()的事情。
总之,我觉得那条蛇咬了它的尾巴。
作为总结,我做了以