我有以下代码,我希望实现的是从Tabscreen
中的某个屏幕更改TabNavigator
的状态。但是我正在尝试这样做的方式,使用全局函数设置状态,根本不起作用,错误undefined is not a function (evaluating 'this.setstate')
import React from 'react';
import {Image, Text, TouchableNativeFeedback, TouchableHighlight} from 'react-native';
import {TabNavigator} from 'react-navigation';
import {Container, Header, Icon, Left, Body} from 'native-base';
import Timeline from './Timeline';
const Mainscreen=TabNavigator(
{
Main:{
screen: Timeline,
navigationOptions:{
tabBarIcon: ({tintColor}) => <Icon name='home' style={{color:tintColor}}/>
}
},
Search:{
screen: props => <Container><TouchableHighlight onPress={()=>globalStateUpdate()}><Container style={{backgroundColor:'rgba(0,132,180,0.5)'}}></Container></TouchableHighlight></Container>,
navigationOptions:{
tabBarIcon: ({tintColor}) => <Icon name='search' style={{color:tintColor}}/>
}
},
}
);
function globalStateUpdate(){
this.setState({
header:<Text>Search</Text>
});
}
class Tabscreen extends React.Component {
constructor(props){
super(props);
this.state={
header:<Text>Home</Text>
};
globalStateUpdate = globalStateUpdate.bind(this);
}
render() {
return (
<Container>
<Header hasTabs >
<Left>
{this.state.header}
</Left>
<Body/>
</Header>
<Mainscreen/>
</Container>
);
}
}
export default Tabscreen;
我该怎么做?反应导航对我的应用程序非常重要,我无法删除它。我相信Redux可以解决这个问题,但是对于单个文本更改来说似乎过于复杂,这就是我所需要的。
答案 0 :(得分:1)
您可以将此功能从TabScreen
传递到其他屏幕以更新TabScreen
状态。
const Mainscreen=TabNavigator(
{
Main:{
screen: Timeline,
navigationOptions:{
tabBarIcon: ({tintColor}) => <Icon name='home' style={{color:tintColor}}/>
}
},
Search:{
screen: props => <Container><TouchableHighlight onPress={()=> props.screenProps.globalStateUpdate({header:<Text>Search</Text>})}><Container style={{backgroundColor:'rgba(0,132,180,0.5)'}}></Container></TouchableHighlight></Container>,
navigationOptions:{
tabBarIcon: ({tintColor}) => <Icon name='search' style={{color:tintColor}}/>
}
},
}
);
class Tabscreen extends React.Component {
constructor(props){
super(props);
this.state={
header:<Text>Home</Text>
globalStateUpdate: newState => this.setState(newState)
};
}
render() {
return (
<Container>
<Header hasTabs >
<Left>
{this.state.header}
</Left>
<Body/>
</Header>
<Mainscreen screenProps={{globalStateUpdate: this.state.globalStateUpdate}} />
</Container>
);
}
}