Question

我在本机反应中有两个组件，无法从子组件中关闭模态。

ListTrips-父级

ModalAddTrip-子项

ListTrips.js

import ModalAddTrip from './ModalAddTrip';
....
....
this.state = {
    isModalAddTripVisible: false
} 
....
handleDismissModalAddTrip = () => {
    this.setState({ isModalAddTripVisible: false });
};

closeModal() {
    this.refs.ModalAdd.handleDismissModalAddTrip();
}
....

<ModalAddTrip
    ref="ModalAdd"
    isVisible={this.state.isModalAddTripVisible}
    onBackDropPress={this.handleDismissModalAddTrip}
    closeModal={() => this.closeModal()}
    onRequestClose={this.handleDismissModalAddTrip}
/>

ModalAddTrip.js

<Modal
    isVisible={isVisible}
    onBackdropPress={onBackDropPress}
    closeModal={this.props.child}
>
<Button
    style={{ fontSize: 18, color: 'white' }}
    containerStyle={{
        padding: 8,
        marginLeft: 70,
    }}
    onPress={this.closeModal}
>

打开模态后，我无法关闭模态。我知道它与引用/属性有关，但是我已经花了好几个小时弄乱了，而且我什么都找不到。我正在尝试按照this.props.closeModal;的方式将ref切换到child组件，但是它也不起作用。在ModalAddTrip中的函数中，但这也不起作用。

任何帮助将不胜感激。谢谢

Answer 1

//对我来说效果很好//

模态示例.JS

...
import Child from "./components/Child.js"

const ModalExample = () => {    

  const [modalVisible, setModalVisible] = useState(true)

  return(
    <Modal visible={ModalVisible}>
      <Child closeModal={()=>setModalVisible(false)}/>
    </Modal>
  )
}
export default ModalExample

CHILD.JS

...
const Child = (closeModal) => {
  render(
    <Button title="close" onPress={closeModal.closeModal}/>
  )
}
export default Child

Answer 2

ModalAddTrip.js

  _toggleModal = () =>
      this.setState({ isVisible: !this.state.isVisible });
  ....

  render() { 
  ....
   <Modal
    isVisible={isVisible}
    onBackdropPress={onBackDropPress}
  >
      <Button
            style={{ fontSize: 18, color: 'white' }}
            containerStyle={{
              padding: 8,
              marginLeft: 70,
            }}
            onPress={this._toggleModal} >
</Modal>

Answer 3

这是我用来处理模态的解决方案。

export default class MyModal extends React.Component<Props, State>{

  constructor(props: Props){
    super(props);
    this.state = {
      visible: false,
    }
  }

  // Use this method to toggle the modal !
  toggleModal = () => {
    this.setState({visible: !this.state.visible});
  }


  render(){
    return(
      <Modal
      isVisible={this.state.visible}
      hideModalContentWhileAnimating
      onBackdropPress={() => {
        this.toggleModal();
      }}
      useNativeDriver
      >
        <View style={{backgroundColor: "white", padding: 5}}>
        </View>
      </Modal>
    );
  }
}

如果我按下它，模态将关闭->它可以自行关闭。

现在可以通过父组件进行管理，只需从模态中获取引用即可：

  <MyModal 
    ref={ref => {
      this.myModal = ref;
    }}
  />

您可以从父组件中切换它：

toggleMyModal = () => {
    if(this.myModal){
      this.myModal.toggleModal();
    }
  }

让我知道您是否可以使用它：）

子组件React Native

3 个答案: