向下滚动时总是刷新我的Web视图

Question

我在scrollview中使用了Web视图。因为向下交换屏幕时需要刷新Web视图。但是向下交换时总是刷新页面。我只需要刷新页面的顶部即可。

            <ScrollView
              refreshControl={
                <RefreshControl

                  refreshing={this.state.refreshing}
                   onRefresh={this._onRefresh}

              />

               }
            scrollEnabled={false}


           <Spinner
                visible={this.state.visible}
                textContent={'Loading...'}
                color={'blue'}

            /> 
       <WebView
          style={{
         marginTop: 0,
         height: 600,
     }}
        startInLoadingState={false} 
        enableNavigate={false}
        ref={(ref) => this.myWebView = ref} 

        source={{uri: }}

       onLoadStart={() => (this.showSpinner())}
       onLoad={() => (this.hideSpinner())}
       domStorageEnabled={false}


       scalesPageToFit={true} 

     >

    </WebView>
    </ScrollView>

        </View>