封面图蒙版iOS和安卓不一样，iOS需要多加一层且第一层画笔不能是透明色

@@ -2099,12 +2099,133 @@ class Utils {
     stream.addListener(ImageStreamListener(listener));
     stream.addListener(ImageStreamListener(listener));
     return completer.future;
     return completer.future;
   }
   }
+
 //  static   Future<ui.Image> getImage(String asset) async {
 //  static   Future<ui.Image> getImage(String asset) async {
 //     ByteData data = await rootBundle.load(asset);
 //     ByteData data = await rootBundle.load(asset);
 //     Codec codec = await ui.instantiateImageCodec(data.buffer.asUint8List());
 //     Codec codec = await ui.instantiateImageCodec(data.buffer.asUint8List());
 //     FrameInfo fi = await codec.getNextFrame();
 //     FrameInfo fi = await codec.getNextFrame();
 //     return fi.image;
 //     return fi.image;
 //   }
 //   }
+  // static Future<Uint8List> canvas(
+  //     context, String _thumbnail, String month, String week) async {
+  //   var pictureRecorder = new ui.PictureRecorder(); // 图片记录仪
+  //   var canvas = new Canvas(pictureRecorder); //canvas接受一个图片记录仪
+  //   var images = await loadImage(_thumbnail, true); // 使用方法获取Unit8List格式的图片
+  //   print(images);
+  //   // Paint _linePaint = new Paint()
+  //   //   ..color = Colors.blue
+  //   //   ..style = PaintingStyle.fill
+  //   //   ..isAntiAlias = true
+  //   //   ..strokeCap = StrokeCap.round
+  //   //   ..strokeWidth = 500;
+  //   // Paint selfPaint = Paint()
+  //   //   ..color = Colors.red
+  //   //   ..style = PaintingStyle.fill
+  //   //   ..isAntiAlias = true
+  //   //   ..strokeCap = StrokeCap.butt
+  //   //   ..strokeWidth = 2;
+  //   final paint = Paint()
+  //     // ..color = Colors.red
+  //     // ..maskFilter = MaskFilter.blur(BlurStyle.normal, 5.0)
+  //     ..style = PaintingStyle.fill;
+
+  //   // 绘制一个矩形作为蒙版
+  //   // canvas.drawRect(Rect.fromLTRB(10, 10, 80, 80), paint);
+
+  //   // // 应用蒙版后，再绘制其他图形
+  //   // paint.maskFilter = null;
+  //   // canvas.drawCircle(Offset(60, 60), 30, paint);
+
+  //   // canvas.drawRect(Rect.fromLTWH(0, 0, 500, 400), paint);
+
+  //   // canvas.drawImage(images, Offset(0, 0), paint);
+
+  //   // 定义源矩形，通常是图像的全部
+  //   final Rect source = Rect.fromLTWH(
+  //       0.0, 0.0, images.width.toDouble(), images.height.toDouble());
+  //   // 定义目标矩形，即画布的大小
+  //   final Rect destination = Rect.fromLTWH(0.0, 0.0, 500, 400);
+  //   // 绘制图像
+  //   canvas.drawImageRect(images, source, destination, paint);
+
+  //   final paint1 = Paint()
+  //     ..color = Colors.black.withOpacity(0.4)
+  //     ..maskFilter = MaskFilter.blur(BlurStyle.normal, 5.0)
+  //     ..style = PaintingStyle.fill;
+
+  //   // 绘制一个矩形作为蒙版
+  //   canvas.drawRect(Rect.fromLTRB(0, 0, 500, 400), paint1);
+
+  //   // 在画布上绘制图片，使用BoxFit来适配画布大小
+  //   // canvas.drawImageRect(
+  //   //     images,
+  //   //     Rect.fromLTWH(0, 0, images.width.toDouble(), images.height.toDouble()),
+  //   //     Rect.fromLTWH(0, 0, images.width.toDouble(), images.height.toDouble()),
+  //   //     paint);
+
+  //   // 绘制文字
+  //   ui.ParagraphBuilder pb2 = ui.ParagraphBuilder(ui.ParagraphStyle(
+  //       textAlign: TextAlign.center,
+  //       fontWeight: FontWeight.normal,
+  //       fontStyle: FontStyle.normal,
+
+  //       //  :MyColours.color_000000,
+  //       fontSize: 26));
+  //   pb2.pushStyle(ui.TextStyle(color: MyColours.color_FFEFC5, fontSize: 26));
+  //   pb2.addText(
+  //       '${Provider.of<UserModel>(context, listen: false).user.sellername}');
+
+  //   // 设置文本的宽度约束
+  //   ParagraphConstraints pc2 = ui.ParagraphConstraints(width: 500);
+  //   ui.Paragraph paragraph2 = pb2.build()..layout(pc2);
+  //   canvas.drawParagraph(paragraph2, Offset(10, 40));
+
+  //   // 绘制文字
+  //   ui.ParagraphBuilder pb = ui.ParagraphBuilder(ui.ParagraphStyle(
+  //       textAlign: TextAlign.center,
+  //       fontWeight: FontWeight.bold,
+  //       fontStyle: FontStyle.normal,
+
+  //       //  :MyColours.color_000000,
+  //       fontSize: 48));
+  //   pb.pushStyle(ui.TextStyle(color: MyColours.color_FFEFC5, fontSize: 48));
+  //   pb.addText(month);
+
+  //   // 设置文本的宽度约束
+  //   ParagraphConstraints pc = ui.ParagraphConstraints(width: 500);
+  //   ui.Paragraph paragraph = pb.build()..layout(pc);
+  //   canvas.drawParagraph(paragraph, Offset(10, 150));
+
+  //   // 绘制文字
+  //   ui.ParagraphBuilder pb3 = ui.ParagraphBuilder(ui.ParagraphStyle(
+  //       textAlign: TextAlign.center,
+  //       fontWeight: FontWeight.bold,
+  //       fontStyle: FontStyle.normal,
+
+  //       //  :MyColours.color_000000,
+  //       fontSize: 42));
+  //   pb3.pushStyle(ui.TextStyle(color: MyColours.color_FFEFC5, fontSize: 42));
+  //   pb3.addText(week);
+
+  //   // 设置文本的宽度约束
+  //   ParagraphConstraints pc3 = ui.ParagraphConstraints(width: 500);
+  //   ui.Paragraph paragraph3 = pb3.build()..layout(pc3);
+  //   canvas.drawParagraph(paragraph3, Offset(10, 230));
+
+  //   //下面的代码是生成图片的关键代码，以上绘制文字和圆圈的代码可以忽略不计
+  //   var picture =
+  //       await pictureRecorder.endRecording().toImage(500, 400); //设置生成图片的宽和高
+  //   var pngImageBytes =
+  //       await picture.toByteData(format: ui.ImageByteFormat.png);
+  //   // var imgBytes = Uint8List.view(pngImageBytes.buffer); //这一行和下面这一行都是生成Uint8List格式的图片（原理还不知道）
+  //   Uint8List pngBytes = pngImageBytes.buffer.asUint8List();
+  //   print(pngBytes); //pngBytes可以放在Image.memory()中预览
+  //   // setState(() {
+  //   //   imageMemory = pngBytes;
+  //   // Uint8List result = await resizeImage(pngBytes); //重置图片尺寸
+  //   Uint8List result = await testFromFileComporessList(context, pngBytes);
+  //   return result;
+  // }
 
 
   static Future<Uint8List> canvas(
   static Future<Uint8List> canvas(
       context, String _thumbnail, String month, String week) async {
       context, String _thumbnail, String month, String week) async {
@@ -2124,20 +2245,37 @@ class Utils {
     //   ..isAntiAlias = true
     //   ..isAntiAlias = true
     //   ..strokeCap = StrokeCap.butt
     //   ..strokeCap = StrokeCap.butt
     //   ..strokeWidth = 2;
     //   ..strokeWidth = 2;
-    final paint = Paint()
-      ..color = Color.fromRGBO(81, 81, 81, 0.4)
+    Paint paint = Paint()
+      ..color = Color.fromRGBO(81, 81, 81, 0.6)
       ..style = PaintingStyle.fill;
       ..style = PaintingStyle.fill;
+    if (Platform.isIOS) {
+      paint = Paint()
+        // ..color = Colors.red
+        // ..maskFilter = MaskFilter.blur(BlurStyle.normal, 5.0)
+        ..style = PaintingStyle.fill;
+    }
 
 
     // canvas.drawRect(Rect.fromLTWH(0, 0, 500, 400), paint);
     // canvas.drawRect(Rect.fromLTWH(0, 0, 500, 400), paint);
 
 
     // canvas.drawImage(images, Offset(0, 0), paint);
     // canvas.drawImage(images, Offset(0, 0), paint);
 
 
-          // 定义源矩形，通常是图像的全部
-      final Rect source = Rect.fromLTWH(0.0, 0.0, images.width.toDouble(), images.height.toDouble());
-      // 定义目标矩形，即画布的大小
-      final Rect destination = Rect.fromLTWH(0.0, 0.0, 500, 400);
-      // 绘制图像
-      canvas.drawImageRect(images, source, destination, paint);
+    // 定义源矩形，通常是图像的全部
+    final Rect source = Rect.fromLTWH(
+        0.0, 0.0, images.width.toDouble(), images.height.toDouble());
+    // 定义目标矩形，即画布的大小
+    final Rect destination = Rect.fromLTWH(0.0, 0.0, 500, 400);
+    // 绘制图像
+    canvas.drawImageRect(images, source, destination, paint);
+
+    if (Platform.isIOS) {
+      final paint1 = Paint()
+        ..color = Colors.black.withOpacity(0.6)
+        ..maskFilter = MaskFilter.blur(BlurStyle.normal, 5.0)
+        ..style = PaintingStyle.fill;
+
+      // 绘制一个矩形作为蒙版
+      canvas.drawRect(Rect.fromLTRB(0, 0, 500, 400), paint1);
+    }
 
 
     // 在画布上绘制图片，使用BoxFit来适配画布大小
     // 在画布上绘制图片，使用BoxFit来适配画布大小
     // canvas.drawImageRect(
     // canvas.drawImageRect(