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[英]How to send value to another screen in React Native with hooks?
[英]How to send and display the value of a text input on another screen with native react?
我想將存儲在變量中的文本輸入數據發送到另一個屏幕,並顯示保存在所述變量中的數據
嘗試通過react-navigation傳遞變量的狀態,但是問題是我有3個屏幕,我想將存儲在變量文本中的數據從屏幕1傳遞到屏幕3
class Screen1 extends Component {
constructor(props) {
super(props);
this.state = {
text: '',
percentage: ''
};
}
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state
var data = {
textData: params.text
}
return {
headerLeft: (
<View style={{ flexDirection: 'row', justifyContent: 'center', alignItems: 'center' }}>
<AntDesign
name="left"
color="rgba(0,0,0,0.5)"
size={30}
style={{ marginLeft: 5 }}
/>
<Text style={{ marginLeft: 20, color: '#000', fontSize: 17, fontWeight: 'bold' }}>Crear regalo</Text>
</View>
),
headerRight: (
<View>
<TouchableOpacity
disabled={navigation.getParam('isDisable')} // get value from params and pass it to disabled props
onPress={() => navigation.navigate('2', { data })}
style={styles.Btn}>
<Text style={styles.TxtBtn}>Siguiente</Text>
</TouchableOpacity>
</View>
),
}
};
// set by a default value in componentDidMount to make the next button disable initially
componentDidMount() {
Alert.alert('Advertencia', 'Ingrese el porcentaje de su descuento');
this.props.navigation.setParams({ isDisable: true });
}
render() {
return (
<View style={styles.container}>
<View style={styles.Box}>
<ImageBackground source={require('../Icons/Regalo.png')} style={styles.Image}>
<View style={styles.ContainerInput}>
<TextInput
style={{ textAlign: 'center', color: '#fff', fontSize: 40, }}
type="numeric"
placeholder="%"
value={this.state.text} //set value from state
onChangeText={(text) => {
//when text length is greater than 0 than next button active otherwise it will be disable
let isDisable = text.length > 0 ? false : true
//set value in the state
this.setState({ text: text })
// set value to params
this.props.navigation.setParams({ isDisable: isDisable });
}} />
<Text style={{ fontSize: 40, color: '#fff', textAlign: 'center' }}>
{this.state.text.split(' ').map((word) => word && '%').join(' ')}
</Text>
</View>
</ImageBackground>
</View>
</View>
);
}
導出默認的Screen1; 我的屏幕二:
class Screen2 extends Component {
constructor(props) {
super(props);
this.state = {
textData: this.props.navigation.state.params.data.textData,
text: ''
};
}
static navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state
var data = {
textData: params.textData
}
return {
headerLeft: (
<View style={{ flexDirection: 'row', justifyContent: 'center', alignItems: 'center' }}>
<AntDesign
name="left"
color="rgba(0,0,0,0.5)"
size={30}
style={{ marginLeft: 5 }}
onPress={() => navigation.navigate('1')}
/>
<Text style={{ marginLeft: 20, color: '#000', fontSize: 17, fontWeight: 'bold' }}>Crear regalo</Text>
</View>
),
headerRight: (
<View>
<TouchableOpacity
disabled={navigation.getParam('isDisable')} // get value from params and pass it to disabled props
onPress={() => navigation.navigate('3', { data })}
style={styles.Btn}>
<Text style={styles.TxtBtn}>Crear</Text>
</TouchableOpacity>
</View>
),
}
};
componentDidMount() {
this.props.navigation.setParams({ isDisable: true });
}
render() {
return (
<View style={styles.container}>
<View style={styles.InputContainer}>
<TextInput
multiline
style={styles.Input}
type="numeric"
placeholder="Describa los términos y condificones de tu regalos"
placeholderTextColor="rgb(196,196,196)"
value={this.state.text} //set value from state
onChangeText={(text) => {
//when text length is greater than 0 than next button active otherwise it will be disable
let isDisable = text.length > 1 ? false : true
//set value in the state
this.setState({ text: text })
// set value to params
this.props.navigation.setParams({ isDisable: isDisable });
}} />
</View>
</View>
);
}
導出默認的Screen2; 我的屏幕三:
class Screen3 extends Component {
constructor(props) {
super(props);
this.state = {
textData: this.props.navigation.state.params.data.textData,
text: '',
percentage: '',
};
}
static navigationOptions = ({ navigation }) => ({
headerLeft: (
<View style={{ flexDirection: 'row', justifyContent: 'center', alignItems: 'center' }}>
<AntDesign
name="left"
color="rgba(0,0,0,0.5)"
size={30}
style={{ marginLeft: 5 }}
onPress={() => navigation.navigate('2')}
/>
<Text style={{ marginLeft: 20, color: '#000', fontSize: 17, fontWeight: 'bold' }}>Crear regalo</Text>
</View>
),
headerRight: (
<View>
<TouchableOpacity
disabled={navigation.getParam('isDisable')} // get value from params and pass it to disabled props
onPress={() => navigation.navigate('4')}
style={styles.Btn}>
<Text style={styles.TxtBtn}>Crear</Text>
</TouchableOpacity>
</View>
),
});
// set by a default value in componentDidMount to make the next button disable initially
componentDidMount() {
this.props.navigation.setParams({ isDisable: true });
}
render() {
let datos = [{
value: 'Banana',
}, {
value: 'Mango',
}, {
value: 'Pear',
}];
var data = {
textData: this.state.textData
}
return (
<View style={styles.container}>
<View style={styles.BoxandInput}>
<View style={styles.ContainerInput}>
<TextInput
style={styles.Input}
multiline
placeholder='Escriba una Descripcion'
placeholderTextColor="rgb(196,196,196)"
maxLength={203}
/>
</View>
<View style={styles.Box}>
<ImageBackground
source={require('../Icons/Regalo.png')}
style={styles.Image}>
<View style={styles.ContainerText}>
<Text style={styles.TextBox}>{data}</Text>
</View>
</ImageBackground>
</View>
</View>
<View style={styles.Regalos}>
<View style={{ justifyContent: 'center', alignItems: 'center', flexDirection: 'row' }}>
<Text style={styles.line}>--------------------------</Text>
<Text style={styles.RegalosText}>Cantidad de Regalos</Text>
<Text style={styles.line}>--------------------------</Text>
</View>
<View style={{ justifyContent: 'center', alignItems: 'center', marginTop: 30 }}>
<TextInput
style={styles.RegalosInput}
placeholder='0'
placeholderTextColor='#000'
maxLength={6}
type='numeric'
/>
<View style={styles.LineInput} />
<Text style={{ fontSize: 10, color: '#ccc', textAlign: 'center', marginTop: 5 }}>60 regalos Disponibles</Text>
<TouchableOpacity style={{ marginTop: 15 }}>
<Text style={{ fontSize: 10, color: 'cyan', textAlign: 'center' }}>Comprar Regalos</Text>
</TouchableOpacity>
</View>
</View>
<View style={styles.ContainerServices}>
<View style={{ justifyContent: 'center', alignItems: 'center', flexDirection: 'row' }}>
<Text style={styles.line}>-----------------------------------</Text>
<Text style={styles.RegalosText}>Servicios</Text>
<Text style={styles.line}>-----------------------------------</Text>
</View>
<Dropdown
dropdownMargins={{ min: 5, max: 10 }}
label='Favorite Fruit'
data={datos}
/>
</View>
</View>
);
}
導出默認值
您可以創建一個數據對象,並將其與導航一起發送到下一個UI。 您可以將數據對象從UI 1傳遞到UI 2,然后可以從UI 2將其發送給UI 3。
在第一個用戶界面中,您可以創建數據變量,例如
var data = {
textData: text
}
將以上代碼包含在代碼的navigationOptions中。
然后在導航調用中還包括數據對象。
onPress={() => navigation.navigate('2', {data})}
在第二個UI中,將傳遞的值分配給構造函數內部的變量。
constructor(props) {
super(props);
this.state = {
textData: this.props.navigation.state.params.data. textData,
}
}
然后,當您要導航到第三個UI時,請創建一個數據變量並按照之前的操作進行發送。
var data = {
textData: this.state.textData
}
將此參數與navigation.navigation一起傳遞,並從第二個UI中訪問它,類似於第二個UI。
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