我看到了this question和 this issue ，但它不能解决我的问题。我尝试了 SizedBox 和 SizedBox.fromSize 以及 BoxConstraints，但它们都不起作用。
我该如何处理？
import 'package:flutter/material.dart';
import 'package:mymovie/bloc_helpers/bloc_event_state_builder.dart';
import 'package:mymovie/logics/intro/intro.dart';
import 'package:mymovie/resources/strings.dart';
import 'package:mymovie/utils/bloc_navigator.dart';
import 'package:mymovie/utils/bloc_snackbar.dart';
import 'package:mymovie/utils/service_locator.dart';
class IntroScreen extends StatefulWidget{
@override
_IntroScreenState createState() => _IntroScreenState();
}
class _IntroScreenState extends State<IntroScreen> with SingleTickerProviderStateMixin{
final IntroBloc introBloc = sl.get<IntroBloc>();
AnimationController animationController;
Animation buttonSqueeze;
@override
void initState() {
super.initState();
animationController = AnimationController(
duration: const Duration(milliseconds: 1500),
vsync: this
);
buttonSqueeze = Tween(
begin: 320.0,
end: 70.0
).animate(CurvedAnimation(
parent: animationController,
curve: Interval(0.0,0.250)
));
animationController.addListener(() {
if(animationController.isCompleted) {
introBloc.emitEvent(IntroEventKakaoLogin());
}
});
}
Future<void> _playAnimation() async{
try {
await animationController.forward();
} on TickerCanceled {}
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
width: double.infinity,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/images/ironman.jpg'),
fit: BoxFit.cover,
colorFilter: ColorFilter.mode(Colors.black.withOpacity(0.6), BlendMode.darken)
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Container(
padding: const EdgeInsets.only(top: 180.0),
child: Text(
'영화일기',
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 70.0
),
),
),
SizedBox(height: 20.0),
Container(
color: Colors.white,
width: 200.0,
height: 4.0,
),
SizedBox(height: 200.0),
AnimatedBuilder(
animation: buttonSqueeze,
builder: (_,__){
return BlocBuilder(
bloc: introBloc,
builder: (context, IntroState state){
if(state.isKakaoLoginSucceeded) {
BlocNavigator.pushReplacementNamed(context, routeHome);
}
if(state.isKakaoLoginFailed) {
BlocSnackbar.show(context, '로그인에 실패하였습니다.');
introBloc.emitEvent(IntroEventStateClear());
}
return GestureDetector(
child: Container(
width: buttonSqueeze.value,
height: 60.0,
decoration: BoxDecoration(
color: Colors.yellow,
borderRadius: BorderRadius.circular(15.0)
),
child: buttonSqueeze.value>75.0 ? Row(
children: <Widget>[
SizedBox(width: 20.0),
buttonSqueeze.value<100.0 ? Container() :
Image.asset('assets/images/kakao.png'),
buttonSqueeze.value<300.0 ? Container() :
Container(
child: Text(
'카카오톡으로 로그인',
style: TextStyle(
color: Colors.brown,
fontWeight: FontWeight.bold,
fontSize: 20.0
),
),
)
],
) :
SizedBox(
child: CircularProgressIndicator(
valueColor: AlwaysStoppedAnimation<Color>(Colors.brown),
strokeWidth: 1.0,
),
width: 30.0,
height: 30.0,
)
),
onTap: () => _playAnimation()
);
}
);
}
)
],
)
)
);
}
}
最佳答案
尝试这种方式，这解决了我的问题:
new Container(
height: 60.0,
child: new Center(child: new CircularProgressIndicator()),
)
关于dart - 如何在 flutter 中调整 CircularProgressIndicator 的大小？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55206949/