Flutter 命名参数 'colors' 未在 SweepGradient 中定义

Question

在我的项目中，我想使用 SweepGradient当我尝试使用此定义时，出现错误:

Context: Found this candidate, but the arguments don't match.
  const SweepGradient({
        ^^^^^^^^^^^^^

我的代码实现:

static final BoxDecoration _gradientBorderDecoration = BoxDecoration(
  shape: BoxShape.circle,
  // https://brandpalettes.com/instagram-color-codes/
  gradient: SweepGradient(
    colors: [
      Color(0xFF833AB4), // Purple
      Color(0xFFF77737), // Orange
      Color(0xFFE1306C), // Red-pink
      Color(0xFFC13584), // Red-purple
    ],
  ),
);

SweepGradient构造类:

const SweepGradient({
  this.center = Alignment.center,
  this.startAngle = 0.0,
  this.endAngle = math.pi * 2,
  required List<Color> colors,
  List<double>? stops,
  this.tileMode = TileMode.clamp,
  GradientTransform? transform,
}) : assert(center != null),
     assert(startAngle != null),
     assert(endAngle != null),
     assert(tileMode != null),
     super(colors: colors, stops: stops, transform: transform);

flutter版本:

Flutter 1.22.0-10.0.pre.153 • channel master • https://github.com/flutter/flutter.git
Framework • revision 2e643651a9 (15 hours ago) • 2020-09-11 23:07:03 -0400
Engine • revision 16b900b63e
Tools • Dart 2.10.0 (build 2.10.0-117.0.dev)

Answer 1

在我升级到最新的稳定 Flutter 版本 1.12 后，这也发生在我身上。我修复它执行以下操作:

输入终端:flutter clean

在文件下 --> 使缓存无效/重新启动(单击此选项)

之后，一切又像魅力一样。