我正在学习React Native,使用的是这个网站:https://www.tutorialspoint.com/react_native/react_native_animations.htm。然而,在我尝试在iPhone上打开应用程序时出现了问题。根据错误提示,它找不到变量,尽管已经导入了该变量。
import React, { Component } from 'react';
import { View, LayoutAnimation, TouchableOpacity, Text, StyleSheet} from 'react-native';
export default class Animations extends Component {
state = {
myStyle: {
height: 100,
backgroundColor: 'red'
}
};
expandElement = () => {
LayoutAnimation.configureNext(LayoutAnimation.Presets.spring);
this.setState({
myStyle: {
height: 400,
backgroundColor: 'red'
}
})
};
collapseElement = () => {
LayoutAnimation.configureNext(LayoutAnimation.Presets.linear);
this.setState({
myStyle: {
height: 100,
backgroundColor: 'red'
}
})
};
render() {
return (
<View>
<View>
<View style={this.state.myStyle}/>
</View>
<TouchableOpacity>
<Text style={styles.button} onPress = {this.expandElement}>
Expand
</Text>
</TouchableOpacity>
<TouchableOpacity>
<Text style={styles.button} onPress = {this.collapseElement}>
Collapse
</Text>
</TouchableOpacity>
</View>
)
}
}
const styles = StyleSheet.create({
button: {
borderWidth: 1,
borderColor: 'red',
color: 'red',
textAlign: 'center',
marginTop: 50,
padding: 10
}
});
sudo react-native run-android
- Ricky Damsudo react-native run-ios
xD 哈哈 - Ricky Dam