factory ImageFilter.blur({ double sigmaX = 0.0, double sigmaY = 0.0, TileMode tileMode = TileMode.clamp })

ImageFilter.blur(sigmaX: 10, sigmaY: 0)

ImageFilter.blur(sigmaX: 0, sigmaY: 10)

ImageFilter.blur(sigmaX: 20, sigmaY: 20)

  const BackdropFilter({
    Key? key,
    required this.filter,
    Widget? child,
  })

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('blur demo'),
      ),
      body: Stack(
        children: [
          /// 圖片在Stack最底層
          Image.asset(
            “assets/images/painting2.jpg”,
          ),
          BackdropFilter(
          	/// 過(guò)濾器
            filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
            /// 必須設(shè)置一個(gè)空容器
            child: Container(),
          ),
    }

 body: Stack(
   children: [
     Image.asset(imgs[0]),
     Positioned(
       left: 100,
       right: 100,
       top: 200,
       bottom: 200,
       /// 必須clip，否則會(huì)對(duì)整個(gè)區(qū)域模糊。
       child: ClipRect(
         child: BackdropFilter(
           filter: ImageFilter.blur(sigmaY: 5, sigmaX: 5),
           child: Container(
             alignment: Alignment.center,
             color: Colors.black.withOpacity(0),
             child: Text('child不會(huì)被模糊處理'),
           ),
         ),
       ),
     )
   ],
 ),

 ImageFiltered(
   imageFilter: ImageFilter.blur(sigmaX: 20, sigmaY: 20),
   child: Image.asset(
     "assets/images/painting2.jpg",
   ),
 )