我有子组件,它在ListView中呈现项目列表。 ListView的数据源自通过父mapStateToProps传递的Redux存储对象。子对象具有按钮,按下时将删除项目。该按钮将触发相应的redux调度操作,并且状态会正确更新,但子组件不会更新。通过断点和控制台语句,我已经验证了当redux状态变为chagnes时,子componentShouldUpdate和子componentWillReceiveProps被触发,但子状态render方法在状态改变后不会触发。
父
<PendingActionsList
proposedStatusChanges={this.props.proposedStatusChanges}
certifications={this.props.certifications}
driverProfile={this.props.driverProfile}
acceptProposedStatusChange={this.props.acceptProposedStatusChange}
rejectProposedStatusChange={this.props.rejectProposedStatusChange}
navigator={this.props.navigator}
/>
儿童
componentWillMount(){
this.setState({
proposedChanges:this.props.proposedStatusChanges
});
}
shouldComponentUpdate(nextProps){
//fires when expected and returns expected value
return nextProps.proposedStatusChanges.length != nextProps.proposedStatusChanges.length;
}
componentWillReceiveProps(nextProps){
//fires when props change as expected
console.log({'will receive props': nextProps});
this.setState({
proposedChanges:nextProps.proposedStatusChanges
});
}
render(){
//only fires at intial render
const dataSource = this.ds.cloneWithRows(this.state.proposedChanges)
return(
<View style={styles.container}>
<Text>Pending Actions </Text>
<ListView
dataSource={dataSource}
renderRow={(rowData) => this.renderRow(rowData)}
renderSeparator={(sectionId,rowId)=><View key={`${sectionId}-${rowId}`} style={{height:1,backgroundColor:'#D1D1D1'}}/>}
/>
</View>
);
我在没有状态字段的情况下尝试了这个,这是我期望的工作,但结果相同。
答案 0 :(得分:1)
那是因为您一直在检查同一对象中的不平等:
//Replace this:
return nextProps.proposedStatusChanges.length != nextProps.proposedStatusChanges.length;
//With this:
return nextProps.proposedStatusChanges.length != this.props.proposedStatusChanges.length;