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nuke-scroll-view

滚动组件

  • 2.2.28
  • npm
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ScrollView

  • category: Components
  • chinese: 滚动组件
  • type: 基本

ScrollView 是一个包装了滚动操作的组件。一般情况下需要一个确定的高度或 flex 1 来保证 ScrollView 的正常展现。

API

属性说明类型默认值
horizontal是否横向booleanfalse
showScrollBar是否显示滚动条booleantrue
showsHorizontalScrollIndicator【废弃】是否显示水平滚动条booleantrue
showsVerticalScrollIndicator 【废弃】是否显示垂直滚动条booleantrue
onEndReachedThreshold设置加载更多的偏移string500rem
onEndReached滚动到底部时的事件( 距离底部 onEndReachedThreshold 长度时触发)event
scrollEventThrottle在滚动过程中,scroll 事件被调用的频率(默认值为 100),用于滚动的节流number100
onScroll滚动时触发的事件function
onScrollStart滚动开始时触发的事件function
onScrollEnd滚动结束时触发的事件function
style容器样式object
contentContainerStyle容器内部 container 样式
idscrollview 标识,如果页面存在多个 ScrollView,且需要使用下拉刷新组件,则必须添加 id 作为标识'scroller_rv'
实例方法
  • resetLoadmore()

    //调用 resetLoadmore 以保证上一次加载不到数据后,下次还能继续触发 onEndReached
    this.refs.scroller1.resetLoadmore();
    
    //省略部分代码
    <ScrollView ref="scroller1" onEndReached={this.loadmore}>
      {this.getViews()}
    </ScrollView>;
    

    这是一个重置 onEndReached 是否能触发的 标记位的方法。标记位默认为 true,即滚动到底部即可触发 onEndReached 事件。但当 onEndReached 触发后,没有通过 setState 增加数据导致页面 scroller 内容变长,(或者反而变短了),native 端会将标记位设置为 false。 此时调用 resetLoadmore ,可以清除标记位,让 onEndReached 可以再次触发。

  • scrollTo(options = { y: 0, animated: true})

    当前 ScrollView 实例需要滚动到某个位置时,目前只支持纵向滚动

    • options:
      • options.y : 位移偏移量,默认 0
      • options.animated: 是否展示滑动动画 , 默认 true
    
      scrollTo = e => {
        this.refs.scroller1.scrollTo({ y : 100 });
      };
      render(){
        return (
          <ScrollView ref="scroller1" style={styles.scroller}>
            <View style={{ height: 400 }}></View>
            <View style={{ height: 400 }}></View>
            <View style={{ height: 400 }}></View>
            <Button onPress={this.scrollTo}> 滑动到 100rem </Button>
          </ScrollView>
        )
      }
    
  • scrollToElement(ref,options = {offset:0, animated:true})

    当前 ScrollView 实例需要把某个元素滚动到可视区域时

    • ref : 元素实例
    • options:
      • options.offset : 位移偏移量,默认 0
      • options.animated: 是否展示滑动动画 , 默认 true
    
      scrollToElement = e => {
        this.refs.scroller1.scrollToElement(this.refs.specialView);
      };
      render(){
        return (
          <ScrollView ref="scroller1" style={styles.scroller}>
            <View style={{ height: 400 }}></View>
            <View style={{ height: 400 }}></View>
            <View style={{ height: 400 }} ref="specialView"><Text> hi, I am special </Text></View>
            <View style={{ height: 400 }}></View>
            <Button onPress={this.scrollToElement}> 滑动到指定元素:ref = specialView </Button>
          </ScrollView>
        )
      }
    

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Package last updated on 09 Oct 2018

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