TextFormField向后输入值[Flutter]

Question

如下面的 GIF 所示，我使用的 TextFormField 正在向后输入值。我也将 TextDirection 属性设置为 ltr 但它没有改变任何东西。其他 TextFormFields 似乎没有这个问题。输入的文本正在使用 Navigator.pop 发送回另一个屏幕，并以相同的向后人工发送。

Weird TextFormField

导致问题的 textFormField 代码：

TextFormField(
// validator: (String value) {
// return value.isEmpty ? "task must have a name" : null;
// },
    textDirection: TextDirection.ltr,
    maxLength: 100,
    controller: newcontroller, // Just an ordinary TextController
    onChanged: (value) {
        setState(() {
            newcontroller.text = value;
        });
    },
    decoration: InputDecoration(
        errorText: _validate  // Just a boolean value set to false by default
                   ? 'Value Can\'t Be Empty' : null,
        labelText: "name of task"
    ),
    style: TextStyle(height: 1.2, fontSize: 20, color: Colors.black87)
)

Answer 1

you can send whatever you want in Navigator.pop(context,whatever you want to pass)

  TextFormField(
//                        validator: (String value) {
//                          return value.isEmpty ? "task must have a name" : null;
//                        },
                textAlign: TextAlign.end,
                maxLength: 100,
                controller: newcontroller, // Just an ordinary TextController
                onChanged: (value) {
                  print(value);
                },

                decoration: InputDecoration(
                    errorText:
                        _validate // Just a boolean value set to false by default
                            ? 'Value Can\'t Be Empty'
                            : null,
                    labelText: "name of task"),
                style:
                    TextStyle(height: 1.2, fontSize: 20, color: Colors.black87),
              ),
              MaterialButton(
                onPressed: () {
                  Navigator.pop(context, newcontroller.text);
                },
                child: Text("GO BACK!"),
              ),

Answer 2

只需删除 onChanged 函数即可。没必要。

Answer 3

You don't have to set text in newcontroller.text when onChanged is called. text enter in your TextFormField is assigned by default to newcontroller.

您收到此错误是因为对于这段代码，

所以，尝试删除下面的代码

 setState(() {
            newcontroller.text = value;
        });

Answer 4

将 onChanged 替换为 onEditingComplete。

onEditingComplete: (value) {
            newController.text = value;
            FocusScope.of(context).unfocus(); //use this to dismiss the screen keyboard
        }

TextFormField向后输入值[Flutter]

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