@override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        padding: const EdgeInsets.all(28),
        color: Colors.blue.shade800,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(Icons.people, size: 78),
            const TextField(
              decoration: InputDecoration(label: Text("Login:")),
            ),
            
             onChanged: _controller.setLogin,

            const TextField(
              decoration: InputDecoration(label: Text("Senha:")),
              obscureText: true,
              onChanged: _controller.setPass,
            ),
            const SizedBox(
              height: 25,
            ),
            ElevatedButton(
              onPressed: () {
                _controller.auth();
              },
              child: const Text("Login"),
            ),
          ],
        ),
      ),
    );
  }
}

CodePudding user response：

Don't use const when you're passing values and methods from controller. It'll give you an error.

Also your onChanged method is outside the TextField. Here's the workig code for you:

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        padding: const EdgeInsets.all(28),
        color: Colors.blue.shade800,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(Icons.people, size: 78),
             TextField(
              decoration:const InputDecoration(label: Text("Login:")),
              onChanged: _controller.setLogin,
            ),
             TextField(
              decoration: InputDecoration(label: Text("Senha:")),
              obscureText: true,
              onChanged: _controller.setPass,
            ),
            const SizedBox(
              height: 25,
            ),
            ElevatedButton(
              onPressed: () {
                _controller.auth();
              },
              child: const Text("Login"),
            ),
          ],
        ),
      ),
    );
  }

CodePudding user response：

Try this:

@override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        padding: const EdgeInsets.all(28),
        color: Colors.blue.shade800,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(Icons.people, size: 78),
            const TextField(
              decoration: InputDecoration(label: Text("Login:")),
              onChanged: _controller.setLogin,
            ),
            const TextField(
              decoration: InputDecoration(label: Text("Senha:")),
              obscureText: true,
              onChanged: _controller.setPass,
            ),
            const SizedBox(
              height: 25,
            ),
            ElevatedButton(
              onPressed: () {
                _controller.auth();
              },
              child: const Text("Login"),
            ),
          ],
        ),
      ),
    );
  }

CodePudding user response：

onChanged should go inside TextField and you will also need to remove const from your TextField. Here's the full working code:

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Container(
      padding: const EdgeInsets.all(28),
      color: Colors.blue.shade800,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.center,
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const Icon(Icons.people, size: 78),
          TextField(
            decoration: InputDecoration(label: Text("Login:")),
            onChanged: _controller.setLogin,
          ),
          TextField(
            decoration: InputDecoration(label: Text("Senha:")),
            obscureText: true,
            onChanged: _controller.setPass,
          ),
          const SizedBox(
            height: 25,
          ),
          ElevatedButton(
            onPressed: () {
              _controller.auth();
            },
            child: const Text("Login"),
          ),
        ],
      ),
    ),
  );
}