reactjs - Prop 类型失败 : Invalid prop `opacity` of type `object` supplied to `RCTView`

Question

我正在关注以下的 React Native 教程: https://facebook.github.io/react-native/docs/animated.html

但是，当我运行代码时，我收到以下警告:失败的 Prop 类型:提供给 RCTView

的 object 类型的 Prop opacity 无效

当调用 fade() 时，组件会消失，没有动画。

这是一个示例代码:

import React, { Component } from 'react';
import {
  AppRegistry,
  Text,
  View,
  Animated,
  StyleSheet
} from 'react-native';

import Icon from 'react-native-vector-icon/FontAwesome'

export default class Sample extends Component {
  state = {
    fadeAnim: new Animated.Value(0),
  }
  fade() {
    Animated.timing(                  // Animate over time
      this.state.fadeAnim,            // The animated value to drive
      {
        toValue: 1,                   // Animate to opacity: 1 (opaque)
        duration: 10000,              // Make it take a while
      }
    ).start();                        // Starts the animation
  }
  render() {
    let { fadeAnim } = this.state;

    return (
      <View style={styles.container}>
        <TouchableHighlight onPress={() => {this.fade()}}>
          <Icon name="circle" size={30} color="#fff" style={{opacity: fadeAnim}}
          >
        </TouchableHighlight>
      </View>
    );
  }
......
}

Answer 1

您应该将 View 更改为 Animated.View。然后，您可以选择添加 fadeAnim 的内插值以进行更细粒度的控制。

像这样的东西应该有效......

render() {
    const { fadeAnim } = this.state;

    // optionally tweak the input / output range to suit your needs
    const opacity = fadeAnim.interpolate({
      inputRange: [0, 1],
      outputRange: [0, 1]
    });

    return (
      <Animated.View style={[styles.container, opacity]}>
        <TouchableHighlight onPress={() => {this.fade()}}>
          <Icon name="circle" size={30} color="#fff"
          >
        </TouchableHighlight>
      </Animated.View>
    );
  }

您可能不想淡出容器 View ，在这种情况下将 Animated.View 移动到 Touchable 内。