flutter 关于TextField如何修改hintText的字体颜色

使用hintStyle修改
比如：

TextField(
     maxLength: 150,
     maxLines: 3,
     decoration: InputDecoration(
              hintText: "点击填写故障文字说明…",
              hintStyle:TextStyle(color: Colors.grey), //修改颜色
              border: InputBorder.none),
),

InputDecoration的参数

const InputDecoration({
    this.icon,
    this.labelText,
    this.labelStyle,
    this.helperText,
    this.helperStyle,
    this.helperMaxLines,
    this.hintText,
    this.hintStyle,
    this.hintMaxLines,
    this.errorText,
    this.errorStyle,
    this.errorMaxLines,
    this.hasFloatingPlaceholder = true,
    this.isDense,
    this.contentPadding,
    this.prefixIcon,
    this.prefix,
    this.prefixText,
    this.prefixStyle,
    this.suffixIcon,
    this.suffix,
    this.suffixText,
    this.suffixStyle,
    this.counter,
    this.counterText,
    this.counterStyle,
    this.filled,
    this.fillColor,
    this.focusColor,
    this.hoverColor,
    this.errorBorder,
    this.focusedBorder,
    this.focusedErrorBorder,
    this.disabledBorder,
    this.enabledBorder,
    this.border,
    this.enabled = true,
    this.semanticCounterText,
    this.alignLabelWithHint,
  }) : assert(enabled != null),
       assert(!(prefix != null && prefixText != null), 'Declaring both prefix and prefixText is not supported.'),
       assert(!(suffix != null && suffixText != null), 'Declaring both suffix and suffixText is not supported.'),
       isCollapsed = false;