Flutter State生命周期
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2022-08-19
16:37:51
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首先来张图
image.png
代码打印这些方法在何时执行
class _LifeDemoState extends State<LifeDemo>
with WidgetsBindingObserver {
@override
void initState() {
// TODO: implement initState
super.initState();
WidgetsBinding.instance.addObserver(this);
print('initState');
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
print(state.toString());
}
@override
void didChangeDependencies() {
// TODO: implement didChangeDependencies
super.didChangeDependencies();
print('didChangeDependencies');
}
@override
void didUpdateWidget(LifeDemo oldWidget) {
// TODO: implement didUpdateWidget
super.didUpdateWidget(oldWidget);
print('didUpdateWidget');
}
@override
Widget build(BuildContext context) {
print('build');
// TODO: implement build
return MaterialApp(
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