当我向TextFormField添加TextEditingController时,文本字段的值在与其交互后被重置/删除。
在代码示例中,我删除了不必要的小部件(用于较短的问题):
Widget build(BuildContext context) {
final usernameTextEditController = TextEditingController();
final passwordTextEditController = TextEditingController();
final confirmPasswordTextEditController = TextEditingController();
//...
TextFormField(
validator: InputValidator.inputUsernameValidate,
controller: usernameTextEditController,
decoration: InputDecoration(
labelText: 'Your user name.',
),
),
TextFormField(
controller: passwordTextEditController,
validator: InputValidator.inputPasswordValidate,
decoration: InputDecoration(
labelText: 'Your password',
),
obscureText: true,
),
TextFormField(
controller: confirmPasswordTextEditController,
validator: InputValidator.inputPasswordValidate,
decoration: InputDecoration(
labelText: 'Confirm Password',
),
obscureText: true,
),
//...
}
你的变量在build() - Function中,这个变量经常被调用,所以你的变量会一次又一次地被初始化(=“重置”)
将它们移动到类build() - 函数所在,应该解决该问题。
有关build()及其调用原因和时间的详细信息,请参阅文档。 build method