报错：setState(...): Cannot update during an existing state transition

Question

代码如下：var Video=require('react-native-video').default;_onProgress(data){   if(!this.state.videoLoaded){        this.setState({            videoLoaded:true        })    }    console.log(data)   console.log('progress')}render(){return(<View style={styles.container}><Video ref='videoPlayer' source={{uri:'http://video.iblack7.com/video_hcwijdwneqantgb4yqgx.mp4'}} onProgress={this._onProgress} /></View>)}以上代码运行的时候报错：setState(...): Cannot update during an existing state transition (such as within `render` or another component's constructor). Render methods should be a pure function of props and state; constructor side-effects are an anti-pattern, but can be moved to `componentWillMount`具体的意思我觉得应该是reader里面执行的this._onProgress方法里有一个setState不能够执行到。但我不知道怎么改，有哪位大神或老师帮忙看看吗？跪谢！！