Flutter 入门指北之输入处理(登录界面实战) 这边需要提下的是 setState 方法,该方法只有 StatefulWidget 才有,当需要修改某个值的内容的时候,通过该方法进行修改,最后的效果图如下,当输入框文字发生变化的时候,监听的 Text 内容会随之改变,获取内容的 Text 当点击按钮了才发生变化 ...
6 TextFormField Flutter not changing appropriately 47 setState does not update TextFormField when use initialValue 8 TextFormField not resetting its Initial Value 1 How to initialize a textfield in flutter 0 Flutter : Problems with textformfield 1 How to fix initial value TextFormField ...
I'm experiencing an issue with TextFormField in Flutter. I'm trying to retrieve values from a JSON Array List and display them within a TextFormField. However, when I attempt to edit or change the value inside the TextFormField, it always reverts back to the initial valu...
(最后更新于2018年8月29日,根据应用于Flutter框架v.0.5.7的更改修复_ensureVisible方法中的错误) 像许多Flutter开发人员一样,我在处理包含TextField或TextFormField的表单时最近遇到了这个问题。当这些字段获得焦点时,键盘会显示并可能覆盖它们。 浏览互联网,我在GitHub上找到了一个源代码,由Collin Jackson(链接)提供。
编译器会帮助开发人员在每个构造函数开头放入一段代码,这段代码会把开发人员在定义成员字段时所指定的...
import 'package:flutter/material.dart'; import 'package:get/get.dart'; class AuthController extends GetxController { final formKey = GlobalKey<FormState>(); String userEmail = ''; String userName = ''; String userPassword = ''; String? emailValidator(String value) { ...
import'package:flutter/material.dart';voidmain() {runApp(MaterialApp(home:Scaffold(appBar:AppBar(), body:constApp(),))); }classAppextendsStatefulWidget{constApp({super.key});@overrideState<App>createState()=>_AppState(); }class_AppStateextendsState<App> {int_i=0;@overrideWidgetbuild(BuildCo...
我有一个带控制器的TextFormField。在这个控制器中,初始值是0,但是用户可以增加或减少数字。代码如下: TextFormField( controller: _controller, keyboardType: TextInputType.number, textAlign: TextAlign.center, onChanged: (value) { _setQuantity(); ...
TextFormField is auto-validating itself without updating its content causing the user to see red fields after he enter in a page containing +6 TextFormFields. Steps to Reproduce Run the following code: import 'package:flutter/material.da...
在StreamInputName方法外部但在类中创建一个TextEditingController,然后将其设置为TextFormField的控制器,...