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ReactNative實現(xiàn)的橫向滑動條效果

更新時間：2024年02月05日 11:29:04 作者：xvzhengyang

本文介紹了ReactNative實現(xiàn)的橫向滑動條效果,本文結(jié)合示例代碼給大家介紹的非常詳細,補充介紹了ReactNative基于寬度變化實現(xiàn)的動畫效果,感興趣的朋友跟隨小編一起看看吧

ReactNative實現(xiàn)的橫向滑動條

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ReactNative實現(xiàn)弧形拖動條

OK，我們先看下效果圖

注意使用到了兩個庫

1.react-native-linear-gradient

2.react-native-gesture-handler

ok，我們看下面的代碼

import {Image, TouchableWithoutFeedback, StyleSheet, View} from 'react-native';
import LinearGradient from 'react-native-linear-gradient';
import React from 'react';
import {
  Gesture,
  GestureDetector,
  GestureHandlerRootView,
} from 'react-native-gesture-handler';
export class HorizntalSlider extends React.Component {
  shouldComponentUpdate(
    nextProps: Readonly<P>,
    nextState: Readonly<S>,
    nextContext: any,
  ): boolean {
    return false;
  }
  constructor(props) {
    super(props);
    this.progress = props.initValue;
    this.step = props.step;
    this.range = props.max - props.min;
    this.currentX = 0;
    this.enable = true;
  }
  _setValueChange(value) {
    this.currentX = value;
    this.selectedTrack.setNativeProps({
      style: {width: value},
    });
    let indicatorValue = value - 5 > 0 ? value - 5 : 0;
    this.indicator.setNativeProps({
      style: {left: indicatorValue - 1},
    });
  }
  componentDidMount(): void {
    if (this.props) {
      this.setPowerState(this.props.openState);
    }
  }
  _add() {
    if (!this.enable) {
      showToast(this.tips);
      const {onEnableClick} = this.props;
      if (onEnableClick) {
        onEnableClick();
      }
      return;
    }
    let tempValue = this.progress + this.step;
    this.progress =
      tempValue > this.props.max ? this.props.max : tempValue;
    let styleValue =
      ((this.progress - this.props.min) / this.range) * 250;
    this._setValueChange(styleValue);
    const {onLastChange, onChange} = this.props;
    onChange(this.progress);
    onLastChange(this.progress);
  }
  _reduce() {
    if (!this.enable) {
      const {onEnableClick} = this.props;
      if (onEnableClick) {
        onEnableClick();
      }
      showToast(this.tips);
      return;
    }
    let tempValue = this.progress - this.step;
    this.progress =
      tempValue < this.props.min ? this.props.min : tempValue;
    let styleValue =
      ((this.progress - this.props.min) / this.range) * 250;
    this._setValueChange(styleValue);
    const {onLastChange, onChange} = this.props;
    onChange(this.progress);
    onLastChange(this.progress);
  }
  _onValueChange(x, isFinalize = false) {
    if (x > 250) {
      x = 250;
    }
    if (x < 0) {
      x = 0;
    }
    this.currentX = x;
    this.progress = this.props.min + parseInt((x / 250) * this.range);
    // if (isFinalize) {
    //   const {onLastChange} = this.props;
    //   onLastChange(this.progress);
    // } else {
    //   const {onChange} = this.props;
    //   onChange(this.progress);
    // }
    this._setValueChange(x);
  }
  setPowerState(state) {
    if (!this.props) {
      return;
    }
    if (state === 1) {
      this.selectedTrack.setNativeProps({
        style: {
          width: this.currentX,
        },
      });
      this.indicator.setNativeProps({
        style: {opacity: 1},
      });
    } else {
      this.selectedTrack.setNativeProps({
        style: {width: 0},
      });
      this.indicator.setNativeProps({
        style: {opacity: 0},
      });
    }
  }
  setEnable(isEnable, tips) {
    if (!this.props) {
      return;
    }
    this.enable = isEnable;
    this.tips = tips;
  }
  gesture = Gesture.Pan()
    .onBegin(e => {
      this._onValueChange(e.x);
    })
    .onUpdate(e => {
      this._onValueChange(e.x);
    })
    .onFinalize(e => {
      this._onValueChange(e.x, true);
    });
  render() {
    this.currentX = ((this.progress - this.props.min) / this.range) * 250;
    this.currentX = this.currentX > 0 ? this.currentX : 0;
    return (
      <View style={[styles.mainContainer, this.props.style]}>
        <GestureHandlerRootView>
          <GestureDetector gesture={this.gesture}>
            <View style={styles.sliderContainer}>
              <LinearGradient
                start={{x: 0, y: 0}}
                end={{x: 1, y: 0}}
                colors={['#4372FF', 'white', '#FF4D4F']}
                style={{
                  width: 252,
                  height: 60,
                }}
              />
              <View
                style={{
                  flexDirection: 'row',
                  alignItems: 'center',
                  position: 'absolute',
                }}>
                <View
                  ref={c => (this.selectedTrack = c)}
                  style={{
                    width: this.currentX,
                    opacity: 0,
                    height: 60,
                  }}
                />
                <View
                  style={{
                    flex: 1,
                    backgroundColor: '#12161a',
                    opacity: 0.8,
                    height: 60,
                  }}
                />
              </View>
              <View
                ref={c => (this.indicator = c)}
                style={[styles.indicator, {left: this.currentX - 7}]}
              />
            </View>
          </GestureDetector>
        </GestureHandlerRootView>
      </View>
    );
  }
}
class Track extends React.Component {
  constructor(props) {
    super(props);
    this.unitViewArr = [];
    for (let i = 0; i < 42; i++) {
      this.unitViewArr[i] = i;
    }
  }
  shouldComponentUpdate(
    nextProps: Readonly<P>,
    nextState: Readonly<S>,
    nextContext: any,
  ): boolean {
    return false;
  }
  render() {
    return (
      <View style={styles.trackContainer}>
        {this.unitViewArr.map((item, index) => {
          return (
            <View
              key={index}
              style={{flexDirection: 'row', alignItems: 'center'}}>
              <View
                style={{
                  height: 60,
                  width: 2,
                  opacity: 0,
                  backgroundColor: '#12161a',
                  borderRadius: 100,
                }}
              />
              <View
                style={{height: 60, width: 4, backgroundColor: '#12161a'}}
              />
            </View>
          );
        })}
      </View>
    );
  }
}
const styles = StyleSheet.create({
  mainContainer: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
  },
  sliderContainer: {
    position: 'relative',
    justifyContent: 'center',
    paddingVertical: 10,
    marginLeft: 10,
    marginRight: 8,
  },
  trackContainer: {
    width: 252,
    flexDirection: 'row',
    position: 'absolute',
  },
  actionImg: {
    width: 60,
    height: 60,
  },
  thumb: {
    height: 34,
    width: 7,
    backgroundColor: 'transparent',
  },
  indicator: {
    width: 0,
    height: 0,
    position: 'absolute',
    top: -2,
    borderLeftWidth: 4,
    borderTopWidth: 4,
    borderRightWidth: 4,
    left: -3,
    borderTopColor: '#FF6A6B',
    borderLeftColor: 'transparent',
    borderRightColor: 'transparent',
  },
});
export default HorizntalSlider;

使用代碼如下

        <GestureHandlerHorizntalSlider
              model={{
                initValue: 20,
                step: 10,
                max: 100,
                min: 0,
              }}>
       </GestureHandlerHorizntalSlider>

拖動條：max（最大值），min（最小值），initValue（當前值），step（步調(diào)）

補充：

ReactNative基于寬度變化實現(xiàn)的動畫效果

效果如上圖所示，通過修改設(shè)備寬度實現(xiàn)動畫效果

import React, {useRef, useEffect, useState} from 'react';
import {Animated, Text, View, Image} from 'react-native';
const FadeInView = props => {
  const fadeAnim = useRef(new Animated.Value(0)).current;
  React.useEffect(() => {
    Animated.timing(
      fadeAnim, // 動畫中的變量值
      {
        toValue: props.currentWidth, // 
        duration: props.durationTime, // 讓動畫持續(xù)一段時間
        //  Style property 'width' is not supported by native animated module
        useNativeDriver: false,
      },
    ).start(); // 開始執(zhí)行動畫
  }, [props.currentWidth]);
  return (
    <Animated.View // 使用專門的可動畫化的View組件
      style={{
        ...props.style,
        width: fadeAnim, // 將寬度綁定到動畫變量值
      }}>
    </Animated.View>
  );
};
// 然后你就可以在組件中像使用`View`那樣去使用`FadeInView`了
export default props => {
  return (
    <FadeInView
      durationTime={props.durationTime}
      currentWidth={props.currentWidth}
      style={{height: 310, backgroundColor: 'pink'}}></FadeInView>
  );
};

使用的代碼如下

<LayoutAnimatedWidth
      currentWidth={this.state.currentWidth}
      durationTime={this.state.durationTime}>
</LayoutAnimatedWidth>

PS：注意上面的代碼和截圖不一致；但是代碼是可以實現(xiàn)上面的效果的。

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ReactNative實現(xiàn)的橫向滑動條效果

目錄

ReactNative實現(xiàn)的橫向滑動條

ReactNative基于寬度變化實現(xiàn)的動畫效果

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