BottomNavigationBar无法应用背景图像-Flutter

问题描述

当 BottomNavigationBarItem 多于3个时，

BottomNavigationBar 不应用背景图像。它显示白色背景而不是应用的图像。请查看代码，让我知道代码中是否缺少某些内容。

 bottomNavigationBar: Container(
            decoration: Boxdecoration(
              image: decorationImage(image: Assetimage('assets/images/tabbar_background.png'),fit: BoxFit.fill),),child: BottomNavigationBar(
              backgroundColor: Colors.transparent,elevation: 0,items: [
                BottomNavigationBarItem(icon: Image.asset("assets/images/eplay.png"),title: Text('title')),BottomNavigationBarItem(icon: Image.asset("assets/images/games.png"),BottomNavigationBarItem(icon: Image.asset("assets/images/retail-location.png"),BottomNavigationBarItem(icon: Image.asset("assets/images/scan.png"),/*  BottomNavigationBarItem(icon: Image.asset("assets/images/scan.png"),*/
              ],

解决方法

将type: BottomNavigationBarType.fixed添加为BottomNavigationBar的属性。

---

我以您的代码为例添加了一个演示：

  bottomNavigationBar: Container(
            decoration: BoxDecoration(
              image: DecorationImage(image: AssetImage('assets/images/tabbar_background.png'),fit: BoxFit.fill),),child: BottomNavigationBar(
              backgroundColor: Colors.transparent,type: BottomNavigationBarType.fixed,// new line
              elevation: 0,items: [
                BottomNavigationBarItem(icon: Image.asset("assets/images/eplay.png"),title: Text('title')),BottomNavigationBarItem(icon: Image.asset("assets/images/games.png"),BottomNavigationBarItem(icon: Image.asset("assets/images/retail-location.png"),BottomNavigationBarItem(icon: Image.asset("assets/images/scan.png"),/*  BottomNavigationBarItem(icon: Image.asset("assets/images/scan.png"),*/
              ],