在Flutter中,可以通过自定义BottomNavigationBar
来更改项目之间的间距。以下是一种实现方式:
BottomNavigationBar
组件,继承自BottomNavigationBar
。build
方法,并使用super
关键字调用父类的build
方法。build
方法中,获取父类的build
结果,并将其返回。padding
属性来调整项目之间的间距。下面是一个示例代码:
import 'package:flutter/material.dart';
class CustomBottomNavigationBar extends BottomNavigationBar {
CustomBottomNavigationBar({
Key key,
@required List<BottomNavigationBarItem> items,
int currentIndex = 0,
ValueChanged<int> onTap,
Color backgroundColor,
double elevation = 8.0,
BottomNavigationBarType type,
Color fixedColor,
IconThemeData iconTheme,
TextStyle selectedItemStyle,
double iconSize = 24.0,
bool showSelectedLabels = true,
bool showUnselectedLabels = true,
}) : super(
key: key,
items: items,
currentIndex: currentIndex,
onTap: onTap,
backgroundColor: backgroundColor,
elevation: elevation,
type: type,
fixedColor: fixedColor,
iconTheme: iconTheme,
selectedItemColor: selectedItemStyle?.color,
unselectedItemColor: selectedItemStyle?.color,
selectedFontSize: selectedItemStyle?.fontSize,
unselectedFontSize: selectedItemStyle?.fontSize,
iconSize: iconSize,
showSelectedLabels: showSelectedLabels,
showUnselectedLabels: showUnselectedLabels,
);
@override
Widget build(BuildContext context) {
final BottomNavigationBar parent = super.build(context);
return Padding(
padding: EdgeInsets.symmetric(vertical: 8.0), // 调整垂直间距
child: parent,
);
}
}
使用自定义的CustomBottomNavigationBar
替代原生的BottomNavigationBar
,并设置合适的间距值即可。
CustomBottomNavigationBar(
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Home',
),
BottomNavigationBarItem(
icon: Icon(Icons.search),
label: 'Search',
),
BottomNavigationBarItem(
icon: Icon(Icons.person),
label: 'Profile',
),
],
currentIndex: _selectedIndex,
onTap: _onItemTapped,
)
这样,你就可以在Flutter中更改BottomNavigationBar()
中项目之间的间距了。
注意:以上示例代码仅供参考,具体实现方式可以根据实际需求进行调整。
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