第二天使用React Native,所以我不知道我在做什么,但是如何使用react-native-scrollable-tab-view从另一个组件中切换标签?
https://github.com/skv-headless/react-native-scrollable-tab-view
我在ButtonPage中有一个MenuButton,我正在尝试使用onPress切换标签。但是,当我点击它时,我得到:
undefined is not an object (evaluating 'this.props.tabView.goToPage')
我得到的是这个
export default class Home extends Component {
render() {
return (
<View style={{flex: 1}}>
<StatusBar
barStyle='light-content'/>
<ScrollableTabView initialPage={1} renderTabBar={false}
ref={(tabView) => { this.tabView = tabView}}>
<FriendsPage tabView={this.tabView} tabLabel="Friends" />
<ButtonPage tabView={this.tabView} tabLabel="Button" />
<HangoutsPage tabView={this.tabView} tabLabel="Hangouts" />
</ScrollableTabView>
</View>
)
}
}
在我的ButtonPage中我有这个
export default class ButtonPage extends Component {
render() {
return (
<View style={styles.container}>
<View style={styles.buttonsContainer}>
<HangoutsButton/>
<View style={styles.spacer}/>
<MenuButton/>
</View>
</View>)
}
}
这个MenuButton由
描述
export default class MenuButton extends Component {
constructor(props) {
super(props)
this.goToPage = this.goToPage.bind(this)
}
goToPage(pageNumber) {
this.props.tabView.goToPage(pageNumber)
}
render() {
return (
<Indicator
position='left top'
value='3'
type='warning'>
<TouchableHighlight
onPress={() => this.goToPage(0)}
underlayColor='#ed8600'
style={styles.touchable}>
<Image source={require('./resources/menuicon.png')} style={styles.image} />
</TouchableHighlight>
</Indicator>
)
}
}
如何获取我的scrollableTabView的参考文件一直到我的按钮,这样我可以点击它并用goToPage更改页面?
我假设您可以将对象粘贴在道具中并将该道具一直向下传递,然后使用MenuButton上的函数goToPage。
答案 0 :(得分:5)
您不需要一直查看参考。只需使用
export default class MenuButton extends Component {
render() {
return (
<Indicator
position='left top'
value='3'
type='warning'>
<TouchableHighlight
onPress={() => this.props.onPress && this.props.onPress()}
underlayColor='#ed8600'
style={styles.touchable}>
<Image source={require('./resources/menuicon.png')} style={styles.image} />
</TouchableHighlight>
</Indicator>
)
}}
export default class ButtonPage extends Component {
render() {
return (
<View style={styles.container}>
<View style={styles.buttonsContainer}>
<HangoutsButton/>
<View style={styles.spacer}/>
<MenuButton onPress={ () => this.props.goToPage && this.props.goToPage() }/>
</View>
</View>)
}}
最后
export default class Home extends Component {
goToPage(pageId) {
this.tabView.goToPage(pageId);
}
render() {
return (
<View style={{flex: 1}}>
<StatusBar
barStyle='light-content'/>
<ScrollableTabView initialPage={1} renderTabBar={false}
ref={(tabView) => { this.tabView = tabView}}>
<FriendsPage tabView={this.tabView} tabLabel="Friends" />
<ButtonPage tabView={this.tabView} tabLabel="Button" goToPage={ () => this.goToPage(1) } />
<HangoutsPage tabView={this.tabView} tabLabel="Hangouts" />
</ScrollableTabView>
</View>
)
}
}