如何在 Jetpack Compose 的 TextField 中正确设置高度？

Question

So I have this textfield,

var value = remember { mutableStateOf("") }

OutlinedTextField(
    value = value.value,
    placeholder = {
        Text("Search Users")
    },
    singleLine = true,
    modifier = Modifier.height(40.dp),
    onValueChange = {
        value.value = it
    },
)

I am setting height to 40.dp as you can see. However it looks like this,

Looks like the text/placeholder is cut off. How to fix this?

Answer 1

I run into same problem using OutlinedTextField. Obviously, this is material component that have exact padding, that is causing crop on text (even with smaller font size).

Here is result:

Solution is to use BasicTextField, and here is the code:

@Composable
private fun CustomTextField(
modifier: Modifier = Modifier,
leadingIcon: (@Composable () -> Unit)? = null,
trailingIcon: (@Composable () -> Unit)? = null,
placeholderText: String = "Placeholder",
fontSize: TextUnit = MaterialTheme.typography.body2.fontSize
) {
var text by rememberSaveable { mutableStateOf("") }
BasicTextField(modifier = modifier
    .background(
        MaterialTheme.colors.surface,
        MaterialTheme.shapes.small,
    )
    .fillMaxWidth(),
    value = text,
    onValueChange = {
        text = it
    },
    singleLine = true,
    cursorBrush = SolidColor(MaterialTheme.colors.primary),
    textStyle = LocalTextStyle.current.copy(
        color = MaterialTheme.colors.onSurface,
        fontSize = fontSize
    ),
    decorationBox = { innerTextField ->
        Row(
            modifier,
            verticalAlignment = Alignment.CenterVertically
        ) {
            if (leadingIcon != null) leadingIcon()
            Box(Modifier.weight(1f)) {
                if (text.isEmpty()) Text(
                    placeholderText,
                    style = LocalTextStyle.current.copy(
                        color = MaterialTheme.colors.onSurface.copy(alpha = 0.3f),
                        fontSize = fontSize
                    )
                )
                innerTextField()
            }
            if (trailingIcon != null) trailingIcon()
        }
    }
)
}

calling it with changed background shape:

CustomTextField(
        leadingIcon = {
            Icon(
                Icons.Filled.Search,
                null,
                tint = LocalContentColor.current.copy(alpha = 0.3f)
            )
        },
        trailingIcon = null,
        modifier = Modifier
            .background(
                MaterialTheme.colors.surface,
                RoundedCornerShape(percent = 50)
            )
            .padding(4.dp)
            .height(20.dp),
        fontSize = 10.sp,
        placeholderText = "Search"
)

Answer 2

您可以设置 minHeight 而不是使用高度：

modifier = Modifier.defaultMinSize(minHeight = 40.dp)

Answer 3

See the problem is that the font size is too big for the provided height. The correct way to provide a height for the field is using the modifiers as you already are doing. However, to work around this problem either increase the height of the text field or decrease the size of the font.