问题描述
如何让AnimatedContainer在键盘关闭时返回到之前的状态(1)?目前通过 onTap 改变容器的位置
Widget _formAuth(String labelForm,String labelButton,void func()) {
return AnimatedContainer(
duration: Duration(seconds: 1),curve: Curves.ease,margin: EdgeInsets.fromLTRB(13,_marginFormAuth,13,50),Widget _inputLoginOrPassword(
Icon icon,String hint,TextEditingController controller,bool obscure) {
return Container(
margin: EdgeInsets.fromLTRB(10,35,10,0),child: TextField(
onTap: () {
setState(() {
_marginFormAuth = 20;
});
},
解决方法
您可以在 state 类中定义一个布尔变量,并在 build 方法中为其赋值,如下所示:
bool isKeyboardOpened;
build () {
isKeyboardOpened = MediaQuery.of(context).viewInsets.bottom > 0;
_marginFormAuth = isKeyboardOpened ? 20 : whateverYouHadBefore;
...
}
这种在您打开键盘时移动容器的解决方案并不是最好的方法,但是,您应该修改代码背后的整个概念,并使用在您聚焦字段时自然滚动的可滚动项 :)
,检测键盘状态使用:https://github.com/adee42/flutter_keyboard_visibility
import 'package:keyboard_visibility/keyboard_visibility.dart';
@protected
void initState() {
super.initState();
KeyboardVisibilityNotification().addNewListener(
onChange: (bool visible) {
print(visible);
},);
}
要为容器设置动画,请使用 AnimationController 而不是 AnimatedContainer:https://flutter.dev/docs/development/ui/animations/tutorial