我目前正在构建我的第一个react-native应用程序,它是IMDB的简单克隆.我使用Navigator
IOS来管理状态事务并尽可能模块化我的应用程序.
当我尝试从我的库组件转到我的电影组件时发生错误.库列出了用户存储的所有电影,电影组件采用简单的方式获取对象并显示传递的电影的信息.
奇怪的是我从我的搜索组件重用了我的Movie Component,我无法重现异常.
库组件：
var React = require('react-native');
var Separator = require('../Helpers/Separator');
var Movie = require('../Movie');
var {
Text,StyleSheet,View,ScrollView,TouchableHighlight,ActivityIndicatorIOS
} = React;
var styles = StyleSheet.create({
container: {
flex: 1,},rowContainer: {
flexDirection: 'column',flex: 1,padding: 10
},name: {
color: '#48BBEC',fontSize: 18,paddingBottom: 5
},year: {
color: '#48BBEC',fontSize: 14,description: {
fontSize: 14,paddingBottom: 5
}
});
class Library extends React.Component{
selectFilm(selectedMovie){
this.props.navigator.push({
title: selectedMovie.Title,component: Movie,passProps: { movie: selectedMovie,canSave: false,isAuthenticated: true }
});
}
render(){
var movies = this.props.movies;
var list = movies.map((item,index) => {
return(
<View key={index}>
<View style={styles.rowContainer}>
<TouchableHighlight
onPress={this.selectFilm.bind(this,movies[index])}
underlayColor='transparent'>
<Text style={styles.name}>{movies[index].title}</Text>
</TouchableHighlight>
<Text stlye={styles.year}>{movies[index].year}</Text>
</View>
<Separator />
</View>
)
});
return(
<ScrollView style={styles.container}>
{list}
</ScrollView>
)
}
};
Library.propTypes = {
movies: React.PropTypes.array.isRequired
};
module.exports = Library;
电影组件：
var React = require('react-native');
var Badge = require('./Badge.js');
var Library = require('./User/Library.js');
var Separator = require('./Helpers/Separator');
var api = require('../Utils/api');
var {
StyleSheet,Image,Text,AsyncStorage
} = React;
var styles = StyleSheet.create({
container: {
flex: 1
},buttonText: {
fontSize: 18,color: 'white',alignSelf: 'center'
},rowContainer: {
padding: 10
},rowTitle: {
color: '#48BBEC',fontSize: 16
},rowContent: {
fontSize: 19
},color: '#111',button: {
height: 45,flexDirection: 'row',backgroundColor: '#758BF4',borderColor: 'white',borderWidth: 1,borderRadius: 8,marginBottom: 0,marginTop: 10,alignSelf: 'stretch',justifyContent: 'center'
}
});
class Movie extends React.Component{
componentDidMount() {
AsyncStorage.getItem("token").then((value) => {
this.setState({"token": value});
}).done();
}
getRowTitle(title){
return title[0] ? title[0].toUpperCase() + title.slice(1): title;
}
getTitle(item){
return item[0] ? item[0].toUpperCase() + item.slice(1) : item;
}
handleSubmit(){
api.addMovie(this.state.token,this.props.movie)
.then((res) => {
console.log(res);
if (res === 'Film already exists') {
alert('Film already exists');
} else {
alert('SAVED');
}
});
}
handleDelete(){
api.deleteMovie(this.props.movie.imdbID)
.then((res) => {
this.props.navigator.pop();
});
}
render(){
var showSave;
if (this.props.isAuthenticated) {
showSave = (
this.props.canSave ? <TouchableHighlight style={styles.button} onPress={this.handleSubmit.bind(this)} underlayColor="#48BBEC"><Text style={styles.buttonText}> SAVE </Text></TouchableHighlight> :
<TouchableHighlight style={styles.button} onPress={this.handleDelete.bind(this)} underlayColor="#48BBEC"><Text style={styles.buttonText}>DELETE </Text></TouchableHighlight>
);
}
var movie = this.props.movie;
var topicArr = ['director','year','rated','plot','country','awards','imdbRating'];
var list = topicArr.map((item,index) => {
if (!movie[item]) {
item = this.getTitle(item);
}
return (
<View key={index}>
<View style={styles.rowContainer}>
<Text style={styles.rowTitle}>{this.getRowTitle(item)}</Text>
<Text style={styles.rowContent}> {movie[item]} </Text>
</View>
<Separator />
</View>
)
});
return(
<ScrollView style={styles.container}>
<Badge movie={this.props.movie} />
{list}
{showSave}
</ScrollView>
)
}
};
Movie.propTypes = {
movie: React.PropTypes.object.isRequired
};
module.exports = Movie;
搜索组件：
var React = require('react-native');
var Movie = require('./Movie');
var api = require('../Utils/api');
var {
Text,TextInput,ActivityIndicatorIOS,AsyncStorage
} = React;
var styles = StyleSheet.create({
// Styles
});
class Search extends React.Component{
constructor(props){
super(props);
this.state = {
title: '',isLoading: false,token: ''
}
}
componentDidMount() {
AsyncStorage.getItem("token").then((value) => {
this.setState({"token": value});
}).done();
}
handleChange(event){
this.setState({
title: event.nativeEvent.text
});
}
handleSubmit(){
var isAuthenticated = this.state.token !== null ? true : false;
this.setState({
isLoading: true
});
api.findMovie(this.state.title)
.then((res) => {
if (!res.Response) {
this.setState({
error: 'Movie not found',isLoading: false
});
} else {
this.props.navigator.push({
title: res.Title,passProps: {movie: res,canSave: true,isAuthenticated: isAuthenticated}
});
this.setState({
isLoading: false,error: false,title: ''
})
}
});
}
render(){
var showErr = (
this.state.error ? <Text>{this.state.error}</Text> : <View></View>
);
return(
<View style={styles.mainContainer}>
<Text style={styles.title}>Search for a movie</Text>
<TextInput
style={styles.searchInput}
value={this.state.title}
onChange={this.handleChange.bind(this)} />
<TouchableHighlight
style={styles.button}
onPress={this.handleSubmit.bind(this)}
underlayColor="white">
<Text style={styles.buttonText}> SEARCH </Text>
</TouchableHighlight>
<ActivityIndicatorIOS
animating={this.state.isLoading}
color= "#111"
size="large">
</ActivityIndicatorIOS>
{showErr}
</View>
)
}
};
module.exports = Search;
这是我的应用程序的应用程序流程：
终于明白了！
我的愚蠢错误.
解决方案是从Movie Component中删除Library Component的需求.删除该行后,错误就消失了.您似乎不能要求转换的相同组件,如果您这样做,您的代码将会中断.
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