将多个回调传递给道具

Question

我想在用户提交一些文本输入后关闭组件。在我关闭之前，我想要调用一些函数（基于提交的文本）。

我尝试将多个回调传递给onSubmitEditing道具。这不起作用，因为无法保证在卸载组件之前我的所有功能都已完成。

所以我想知道为什么允许这样做？

我最终编写了一个退出函数，它在卸载promise之前包装了我必须做的所有事情。这是这种情况的最佳做法吗？

class AlbumCreateView extends Component {
  constructor(props){
    super(props)
    this.state = {
      newAlbumName: '',
    }
    this._keyboardDidHide = this._keyboardDidHide.bind(this)
    this._keyboardWillShow = this._keyboardWillShow.bind(this)
    this.exitFunction = this.exitFunction.bind(this)
  }

  componentWillMount () {
    this.keyboardWillShowListener = Keyboard.addListener('keyboardWillShow', this._keyboardWillShow);
    this.keyboardDidHideListener = Keyboard.addListener('keyboardDidHide', this._keyboardDidHide);
  }

  componentWillUnmount (e) {
    this.keyboardWillShowListener.remove();
    this.keyboardDidHideListener.remove();
    LayoutAnimation.configureNext(LayoutAnimation.Presets.linear)
    this.props.raiseKeyboard(0)
  }

  _keyboardWillShow (e) {
    LayoutAnimation.configureNext(LayoutAnimation.Presets.linear)
    this.props.raiseKeyboard(e.endCoordinates.height)

  }

  _keyboardDidHide () {

  }
  newAlbumSaveHandler() {
    MySwiftClass.createAndSaveToNewAlbum(this.state.newAlbumName)
    LayoutAnimation.configureNext(LayoutAnimation.Presets.linear),
    this.props.raiseKeyboard(0)
  }
  exitFunction() { *****
    const saveAndDismissKeyboardPromise = new Promise((resolve, reject) => {
      //I want to make sure these these two functions are called before the component unmounts
      this.newAlbumSaveHandler()
      Keyboard.dismiss()
      resolve()
    })
    //this component lives in a modal, the following callback toggles the isVisible state in the parent and unmounts this component
    saveAndDismissKeyboardPromise.then(this.props.toggleModal)
  }

  render(){
    return(
      <View style={styles.flatList}>
        <View style={styles.albumButton}>
        </View>
        <TextInput onSubmitEditing={this.exitFunction} *****
          keyboardType='default'
          autoFocus={true}
          autoCorrect={false}
          textAlign='center'
          onChangeText={(newAlbumName) => this.setState({newAlbumName})}
          enablesReturnKeyAutomatically={true}
          style={{width: 200}}
        />

      </View>
    )
  }
}