Validação de campo de texto em vibração
TextFormField(
// The validator receives the text that the user has entered.
validator: (value) {
if (value == null || value.isEmpty) {
return 'Please enter some text';
}
return null;
},
),
/*
The TextFormField widget renders a material design
text field and can display validation errors when
they occur.
Validate the input by providing a validator() function
to the TextFormField. If the user’s input isn’t valid,
the validator function returns a String containing an
error message. If there are no errors, the validator
must return null.
For this example, We create a validator that ensures the TextFormField
isn’t empty. If it is empty, then we return a friendly error message.
*/
CoderHomie