在类组件内部,我有一个panResponder
并且在onPanResponderRelease
事件期间,我想更新类组件的状态。但是,在调用 setState 后,状态永远不会更新。
type ExampleState = {
duration: number
};
class Example extends Component<ExampleProps, ExampleState> {
constructor(props: ExampleProps) {
super(props);
this.state = {
duration: 0
};
this.setupPanResponder();
}
setupPanResponder = (): void => {
this.panResponder = PanResponder.create({
onPanResponderTerminationRequest: () => false,
onStartShouldSetPanResponder: () => true,
onPanResponderGrant: () => {
// grant code here
},
onPanResponderMove: (event, gestureState) => {
// move code here
},
onPanResponderRelease: () => {
this.setState({ duration: 0 }); // does not seem to actually be setting the state
}
});
};
}
为什么 setState 不起作用?如果我在另一个事件中使用 setState,比如onPanResponderMove
,它似乎确实有效,这对我来说很奇怪。