[英]Flutter TextFormField onChangeText it is not showing icon
I am new in flutter.我是 flutter 的新手。 I am trying to set icon when text changed.我正在尝试在文本更改时设置图标。
It is not showing icon as I addListner to my controller.当我将Listner 添加到我的controller 时,它没有显示图标。
TextEditingController _controller = new TextEditingController();
Defined listner function.定义监听器 function。
_controller.addListener(() {
setState(() {});
});
TextFormField(
controller: _usernameController,
decoration: InputDecoration(
labelText: 'Username',
suffixIcon: _usernameController.text.length > 0 ? IconButton(
onPressed: () {
//do code for button press
},
icon: Icon(Icons.check, color: Colors.grey)
) : null
),
)
You need to add your listener to your _usernameController not your _controller您需要将侦听器添加到您的 _usernameController 而不是您的 _controller
_usernameController.addListener(() {
setState(() {});
});
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