Flutter自定义TextField高度

1. TextField设置isCollapsed = true
2. 自定义InputField的InputDecoration的contentPadding
3. 剩下的就交给文字行高了

	TextField(
		controller: controller,
		isCollapsed: true,
		contentPadding:
                    EdgeInsets.symmetric(vertical: 20.rpx, horizontal: 15.rpx),
	)

多去看官方文档和注释!!!

/// The padding for the input decoration's container.
///
/// The decoration's container is the area which is filled if [filled] is true
/// and bordered per the [border]. It's the area adjacent to [icon] and above
/// the widgets that contain [helperText], [errorText], and [counterText].
///
/// By default the `contentPadding` reflects [isDense] and the type of the
/// [border].
///
/// If [isCollapsed] is true then `contentPadding` is [EdgeInsets.zero].
///
/// If `isOutline` property of [border] is false and if [filled] is true then
/// `contentPadding` is `EdgeInsets.fromLTRB(12, 8, 12, 8)` when [isDense]
/// is true and `EdgeInsets.fromLTRB(12, 12, 12, 12)` when [isDense] is false.
/// If `isOutline` property of [border] is false and if [filled] is false then
/// `contentPadding` is `EdgeInsets.fromLTRB(0, 8, 0, 8)` when [isDense] is
/// true and `EdgeInsets.fromLTRB(0, 12, 0, 12)` when [isDense] is false.
///
/// If `isOutline` property of [border] is true then `contentPadding` is
/// `EdgeInsets.fromLTRB(12, 20, 12, 12)` when [isDense] is true
/// and `EdgeInsets.fromLTRB(12, 24, 12, 16)` when [isDense] is false.
final EdgeInsetsGeometry contentPadding;