一个简单的rn 淡入动画

自定义的component FadeInView

import React, {Component} from 'react';
import {Animated} from 'react-native';

class FadeInView extends Component {
    constructor(props) {
        super(props);
        this.state = {
            fadeAnim: new Animated.Value(0)
        };
    }
    componentDidMount() {
        Animated
            .timing(this.state.fadeAnim, {
            toValue: 1,
            //5秒
            duration: 5000
        })
            .start();
    }
    render() {
        return (
            <Animated.View
                style={{
                ...this.props.style,
                opacity: this.state.fadeAnim
            }}>
                {this.props.children}
            </Animated.View>
        );
    }
}
//暴露组件
module.exports = FadeInView;

index.android.js 使用FadeInView

import React, {Component} from 'react';
import {
  AppRegistry,
  TouchableOpacity,
  Text,
  View,
  StyleSheet,
  Alert
} from 'react-native';
var FadeInView = require('./src/fadeview');
class MyButton extends Component {
  _onPressButton() {
    Alert.alert('demoproject', 'you have tap the button', {cancelable: true})
  }

  render() {
    return (
      <View style={styles.container}>
        <FadeInView
          style={{
          width: 250,
          height: 50,
          backgroundColor: 'powderblue',
          alignItems: 'center',
          justifyContent: 'center'
        }}>
          <Text
            style={{
            fontSize: 28,
            textAlign: 'center',
            margin: 10
          }}>Fading in</Text>
        </FadeInView>
      </View>

    )
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center'
  }
});

// 注册应用(registerComponent)后才能正确渲染 注意：只把应用作为一个整体注册一次，而不是每个组件/模块都注册
AppRegistry.registerComponent('DemoProject', () => MyButton);