布尔变量的值发生变化,但在文本字段中未显示错误文本
这些是声明
int i = 0;
List<bool> validationList = [];
List<Widget> listDynamic = [];
List<TextEditingController> controllersList = [];
这是验证方法
submitData()
{
for(int a = 0 ; a < i; a++ ){
if(controllersList[a].text == ''){
setState(() {
validationList[a] =true;
print(validationList[a]);
});
}
}
}
这是动态创建文本文件的方法
addDynamic() {
validationList = List.from(validationList)..add(false);
controllersList = List.from(controllersList)..add(TextEditingController());
listDynamic = List.from(listDynamic)..add(Column(
children: <Widget>[
Container(
margin: EdgeInsets.fromLTRB(20, 40, 20, 0),
child: TextField(
decoration: InputDecoration(
errorText: validationList[i] == true ? 'Value cant be empty' : null,
labelText: ('ImageURL'),
prefixIcon: Icon(Icons.image),
helperText: 'www.example.com',
border: OutlineInputBorder()),
controller: controllersList[i],
),
),
SizedBox(height: 20),
],
));
i++;
setState(() {});
}
答案 0 :(得分:0)
将'key'属性添加到TextField中: 键:ObjectKey(“ key $ i”),