Question

我一直在尝试从这个npm包中实现react-image-gallery v0.8.7（0.8.8有一个bug）：https://github.com/xiaolin/react-image-gallery并在example之后集成如下（我正在开发一个Meteor网络应用程序）：

class MyGallery extends Component {
    constructor(props) {
    super(props);
    this.state = {
      mediaSrc: [],
      isFullScreen: false
    };
  }

  componentWillMount() {
    const mediaSrc = this.props.myObject.pictures.map((picture) => {
      return { original: picture, thumbnail: picture };
    });
    this.setState({ mediaSrc });
  }

  _onImageClick(event) {
    if (this.state.isFullScreen) {
      this._imageGallery.exitFullScreen();
      this.setState({ isFullScreen: false });
    } else {
      this._imageGallery.fullScreen();
      this.setState({ isFullScreen: true });
    }
  }

  render() {
    return (
      <div className="dish row">
        <figure className="center col-12" >
          <div className="dish__preview_container">
            <ImageGallery
              ref={i => this._imageGallery = i}
              items={this.state.mediaSrc}
              onClick={this._onImageClick.bind(this)}
              showFullscreenButton={false}
              showIndex
              showPlayButton={false}
              showThumbnails={false}
            />
         </div>
      );
  }
}

MyGallery.propTypes = {
  myObject: PropTypes.object.isRequired,
}

}

对象myObject在图片数组中包含以下值：

[ 'https://media-cdn.tripadvisor.com/media/photo-s/05/6c/2b/9b/america-s-taco-shop.jpg',
  'https://www.cocinavital.mx/wp-content/uploads/2017/09/tostadas-de-tinga-de-pechuga-de-pollo-con-chipotle-video.jpg'
]

当渲染ImageGallery时，按预期显示，但是当点击按钮aria-label =“Previous Slide”或aria-label =“Next Slide”时，不显示相应的图像并抛出以下异常开发人员工具控制台：

Warning: Can't call setState (or forceUpdate) on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in the componentWillUnmount method.
    in ImageGallery (created by MyGallery)
    in div (created by MyGallery)

对解决方案有任何建议吗？

更新：在componenteWillUmnount方法上重置了组件状态变量。删除它，也尝试使用Meteor Reactive Dic t而不是组件状态变量。但是例外仍然存在。

Answer 1

根据React Official Documentation，您不应在setState()方法中调用componentWillUnmount，因为您的组件永远不会被重新呈现。到目前为止，我只使用此方法删除componentDidMount()中添加的事件侦听器。

无法在卸载的组件上调用setState（或forceUpdate）。反应图像库中的内存泄漏

1 个答案: