英文:
Changing Like Button Color in Flutter
问题
我尝试在按下时更改IconButton的图标形状和颜色，但没有任何反应。以下是我的代码：
String adTitle = widget.documentSnapshot['Title'];
String $adDescription = widget.documentSnapshot['Description'];
IconData _iconData = Icons.favorite_border_outlined;
Color _iconColor = Colors.red;
return Scaffold(
body: Column(
children: [
Row(
children: [
IconButton(
icon: Icon(
_iconData,
size: 40,
color: _iconColor,
),
onPressed: () {
setState(() {
_iconData = Icons.favorite;
_iconColor = Colors.blue;
});
},
)
],
),
],
),
);
英文:
I try to change the icon shape and color of the IconButton when it is pressed but there is nothing happens. here is my code:
String adTitle = widget.documentSnapshot['Title'];
String $adDescription = widget.documentSnapshot['Description'];
IconData _iconData = Icons.favorite_border_outlined;
Color _iconColor = Colors.red;
return Scaffold(
body: Column(
children: [
Row(
children: [
IconButton.outlined(
icon: Icon(
_iconData,
size: 40,
color: _iconColor,
),
onPressed: () {
setState(() {
_iconData = Icons.favorite;
_iconColor = Colors.blue;
});
},
)
],
),
],
),
);
}
答案1
得分: 2
IconData _iconData = Icons.favorite_border_outlined;
Color _iconColor = Colors.red;
它们目前是局部变量。要使其正常工作，您需要将它们定义为类级别的变量（在build方法之外定义它们）。
<details>
<summary>英文:</summary>
IconData _iconData = Icons.favorite_border_outlined;
Color _iconColor = Colors.red;
They are local variables as of now. You need to make them class level varibales for this to work (define them outside build method)
</details>
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