Question

当键盘的 KeyboardType 设置为 KeyboardType.Number 时，我目前无法将用户输入捕获到文本字段中。

如果键盘设置为 KeyboardType.Text，文本字段会按预期更新，但是当设置为 KeyboardType.Number 时，文本字段无法更新。

这是为什么？以及如何更改我的代码，以便在单击文本字段时显示数字键盘，并在按下数字时更新文本字段中的相关数字。

以下代码不会更新文本字段（当设置为 KeyboardType.Number 时）...

@Composable
fun MyNumberField() {

    var text = remember { mutableStateOf("")}

    val change : (String) -> Unit = { it ->
        value.value = it
    }

    TextField(
        value = text.value,
        modifier = Modifier.fillMaxWidth(),
        keyboardOptions = KeyboardOptions.Default.copy(keyboardType = KeyboardType.Number),
        onValueChange = change
    )

}

以下代码确实更新了文本字段（当设置为 KeyboardType.Text 时）...

@Composable
fun MyNumberField() {

    var text = remember { mutableStateOf("")}

    val change : (String) -> Unit = { it ->
        text.value = it
    }

    TextField(
        value = value.value,
        modifier = Modifier.fillMaxWidth(),
        keyboardOptions = KeyboardOptions.Default.copy(keyboardType = KeyboardType.Text),
        onValueChange = change
    )

}

非常感谢

Answer 1

您应该更新 text.value，而不是 value.value，您的代码中有错别字，请将其更改为此。

@Composable
fun MyNumberField() {

    var text = remember { mutableStateOf("")}

    val change : (String) -> Unit = { it ->
        value.value = it    // you have this which is not correct and I don't think it even compiled
        text.value = it  // it is supposed to be this 
    }

    TextField(
        value = text.value,
        modifier = Modifier.fillMaxWidth(),
        keyboardOptions = KeyboardOptions.Default.copy(keyboardType = KeyboardType.Number),
        onValueChange = change
    )

}

Jetpack Compose 数字输入到 TextField

1 个答案: