gpt4 book ai didi

javascript - 如何从项目列表中选择 ScrollView 中的中心项目

转载 作者:行者123 更新时间:2023-11-30 11:33:00 26 4
gpt4 key购买 nike

我的应用程序中有来自两个 ScrollView 的 2 个 ScrollView ,我应该选择每个出现在滚动中心的项目,然后继续我在代码中的下一个事件

如果有任何 Prop 可以选择列表中的中心项目,我该怎么做

这是我的 js 文件,其中显示了 2 个 ScrollViews:

import React, { Component } from 'react';
import { Image, Text, View, TouchableWithoutFeedback, Animated } from 'react-native';
import { Actions } from 'react-native-router-flux';
import TeamScroll from './TeamScroll';

const a = require('./Images/over3_selected.png');
const b = require('./Images/over3.png');
const c = require('./Images/over5_selected.png');
const d = require('./Images/over5.png');
const e = require('./Images/over10_selected.png');
const f = require('./Images/over10.png');

class ChallengeScreen extends Component {
state = {
threePressed: false,
fivePressed: false,
tenPressed: false
}
componentWillMount() {
this.slide1 = new Animated.Value(0);
this.slide2 = new Animated.Value(0);
this.slide3 = new Animated.Value(0);

this.ball1();
this.ball2();
this.ball3();
}
ball1() {
Animated.timing(
this.slide1, {
delay: 100,
toValue: -140,
duration: 700,
}
).start();
}

ball2() {
Animated.timing(
this.slide2, {
delay: 200,
toValue: -160,
duration: 900,
}
).start();
}
ball3() {
Animated.timing(
this.slide3, {
delay: 300,
toValue: -180,
duration: 1100,
}
).start();
}


render() {
return (
<Image
source={require('./Images/bg_inner.png')} style={styles.backgroundStyle}>

<Text style={styles.chooseteamtextStyle}>
CHOOSE YOUR TEAM
</Text>
<Image source={require('./Images/team-logo-band.png')} style={styles.band1Style}>
<TeamScroll />
</Image>

<Text style={styles.opponentStyle}>
YOUR OPPONENT
</Text>
<Image source={require('./Images/team-logo-band.png')} style={styles.band2Style}>
<TeamScroll />
</Image>

<Text style={styles.overstextStyle}>
OVERS
</Text>
<View style={styles.viewStyle}>

<TouchableWithoutFeedback
onPress={() => playFunc(3, this.props.challenge)}
onPressIn={() => {
this.setState({ threePressed: true });
}}
onPressOut={() => {
this.setState({ threePressed: false });
}}
>
<Animated.Image source={this.state.threePressed ? a : b}
style={[styles.over3Style, { transform: [{ translateY: this.slide1 }] }]} />
</ TouchableWithoutFeedback>

<TouchableWithoutFeedback
onPress={() => playFunc(5, this.props.challenge)}
onPressIn={() => {
this.setState({ fivePressed: true });
}}
onPressOut={() => {
this.setState({ fivePressed: false });
}}>
<Animated.Image source={this.state.fivePressed ? c : d}
style={[styles.over5Style, { transform: [{ translateY: this.slide2 }] }]} />
</ TouchableWithoutFeedback>

<TouchableWithoutFeedback
onPress={() => playFunc(10, this.props.challenge)}
onPressIn={() => {
this.setState({ tenPressed: true });
}}
onPressOut={() => {
this.setState({ tenPressed: false });
}}>
<Animated.Image source={this.state.tenPressed ? e : f}
style={[styles.over10Style, { transform: [{ translateY: this.slide3 }] }]} />
</ TouchableWithoutFeedback>

</View>
</ Image>
);
}
}
function playFunc(num, param) {
if (num === 3 && param === 'Computer') {
Actions.screen4();
}
else if (num === 5 && param === 'Computer') {
Actions.screen4();
}
else if (num === 10 && param === 'Computer') {
Actions.screen4();
}
else if (num === 3 && param === 'Team') {
Actions.screen3();
}
else if (num === 5 && param === 'Team') {
Actions.screen3();
}
else if (num === 10 && param === 'Team') {
Actions.screen3();
}
}
const styles = {
viewStyle: {

flexDirection: 'row',
justifyContent: 'flex-start'
},
backgroundStyle: {
flex: 1,
width: undefined,
height: undefined,
flexWrap: 'wrap',

},
chooseteamtextStyle: {
textAlign: 'center',
marginTop: 80,
fontSize: 20,
color: 'white',
fontFamily: 'Switzerland-Cond-Black-Italic',
transform: [{ rotate: '-14deg' }]
},
band1Style: {
marginTop: -10,
resizeMode: 'stretch',
width: 380,
height: 150,
},
opponentStyle: {
textAlign: 'center',
marginTop: -10,
fontSize: 20,
color: 'white',
fontFamily: 'Switzerland-Cond-Black-Italic',
transform: [{ rotate: '-15deg' }]
},
band2Style: {
resizeMode: 'stretch',
marginTop: -10,
width: 380,
height: 150,
},
overstextStyle: {
textAlign: 'center',
bottom: 10,
fontSize: 20,
color: 'white',
fontFamily: 'Switzerland-Cond-Black-Italic',
transform: [{ rotate: '-15deg' }]
},
over3Style: {
flexDirection: 'row',
alignItems: 'flex-start',
width: 80,
height: 80,
top: 170,
left: 70,
},
over5Style: {
flexDirection: 'row',
alignItems: 'center',
width: 80,
height: 80,
bottom: -170,
left: 70
},
over10Style: {
flexDirection: 'row',
alignItems: 'flex-end',
width: 80,
height: 80,
top: 170,
right: -70
}
};
export default ChallengeScreen;

这是我应用 ScrollView 的 js 文件:

import React, { Component } from 'react';
import { Image, Text, View, TouchableWithoutFeedback, Animated } from 'react-native';
import { Actions } from 'react-native-router-flux';
import TeamScroll from './TeamScroll';

const a = require('./Images/over3_selected.png');
const b = require('./Images/over3.png');
const c = require('./Images/over5_selected.png');
const d = require('./Images/over5.png');
const e = require('./Images/over10_selected.png');
const f = require('./Images/over10.png');

class ChallengeScreen extends Component {
state = {
threePressed: false,
fivePressed: false,
tenPressed: false
}
componentWillMount() {
this.slide1 = new Animated.Value(0);
this.slide2 = new Animated.Value(0);
this.slide3 = new Animated.Value(0);

this.ball1();
this.ball2();
this.ball3();
}
ball1() {
Animated.timing(
this.slide1, {
delay: 100,
toValue: -140,
duration: 700,
}
).start();
}

ball2() {
Animated.timing(
this.slide2, {
delay: 200,
toValue: -160,
duration: 900,
}
).start();
}
ball3() {
Animated.timing(
this.slide3, {
delay: 300,
toValue: -180,
duration: 1100,
}
).start();
}


render() {
return (
<Image
source={require('./Images/bg_inner.png')} style={styles.backgroundStyle}>

<Text style={styles.chooseteamtextStyle}>
CHOOSE YOUR TEAM
</Text>
<Image source={require('./Images/team-logo-band.png')} style={styles.band1Style}>
<TeamScroll />
</Image>

<Text style={styles.opponentStyle}>
YOUR OPPONENT
</Text>
<Image source={require('./Images/team-logo-band.png')} style={styles.band2Style}>
<TeamScroll />
</Image>

<Text style={styles.overstextStyle}>
OVERS
</Text>
<View style={styles.viewStyle}>

<TouchableWithoutFeedback
onPress={() => playFunc(3, this.props.challenge)}
onPressIn={() => {
this.setState({ threePressed: true });
}}
onPressOut={() => {
this.setState({ threePressed: false });
}}
>
<Animated.Image source={this.state.threePressed ? a : b}
style={[styles.over3Style, { transform: [{ translateY: this.slide1 }] }]} />
</ TouchableWithoutFeedback>

<TouchableWithoutFeedback
onPress={() => playFunc(5, this.props.challenge)}
onPressIn={() => {
this.setState({ fivePressed: true });
}}
onPressOut={() => {
this.setState({ fivePressed: false });
}}>
<Animated.Image source={this.state.fivePressed ? c : d}
style={[styles.over5Style, { transform: [{ translateY: this.slide2 }] }]} />
</ TouchableWithoutFeedback>

<TouchableWithoutFeedback
onPress={() => playFunc(10, this.props.challenge)}
onPressIn={() => {
this.setState({ tenPressed: true });
}}
onPressOut={() => {
this.setState({ tenPressed: false });
}}>
<Animated.Image source={this.state.tenPressed ? e : f}
style={[styles.over10Style, { transform: [{ translateY: this.slide3 }] }]} />
</ TouchableWithoutFeedback>

</View>
</ Image>
);
}
}
function playFunc(num, param) {
if (num === 3 && param === 'Computer') {
Actions.screen4();
}
else if (num === 5 && param === 'Computer') {
Actions.screen4();
}
else if (num === 10 && param === 'Computer') {
Actions.screen4();
}
else if (num === 3 && param === 'Team') {
Actions.screen3();
}
else if (num === 5 && param === 'Team') {
Actions.screen3();
}
else if (num === 10 && param === 'Team') {
Actions.screen3();
}
}
const styles = {
viewStyle: {

flexDirection: 'row',
justifyContent: 'flex-start'
},
backgroundStyle: {
flex: 1,
width: undefined,
height: undefined,
flexWrap: 'wrap',

},
chooseteamtextStyle: {
textAlign: 'center',
marginTop: 80,
fontSize: 20,
color: 'white',
fontFamily: 'Switzerland-Cond-Black-Italic',
transform: [{ rotate: '-14deg' }]
},
band1Style: {
marginTop: -10,
resizeMode: 'stretch',
width: 380,
height: 150,
},
opponentStyle: {
textAlign: 'center',
marginTop: -10,
fontSize: 20,
color: 'white',
fontFamily: 'Switzerland-Cond-Black-Italic',
transform: [{ rotate: '-15deg' }]
},
band2Style: {
resizeMode: 'stretch',
marginTop: -10,
width: 380,
height: 150,
},
overstextStyle: {
textAlign: 'center',
bottom: 10,
fontSize: 20,
color: 'white',
fontFamily: 'Switzerland-Cond-Black-Italic',
transform: [{ rotate: '-15deg' }]
},
over3Style: {
flexDirection: 'row',
alignItems: 'flex-start',
width: 80,
height: 80,
top: 170,
left: 70,
},
over5Style: {
flexDirection: 'row',
alignItems: 'center',
width: 80,
height: 80,
bottom: -170,
left: 70
},
over10Style: {
flexDirection: 'row',
alignItems: 'flex-end',
width: 80,
height: 80,
top: 170,
right: -70
}
};
export default ChallengeScreen;

团队滚动

import React, { Component } from 'react';
import { ScrollView, View, Image } from 'react-native';

class TeamScroll extends Component {
render() {
return (
<ScrollView
horizontal
style={styles.scrollViewStyle}
showsHorizontalScrollIndicator={false}>
<View style={styles.viewStyle}>

<View style={styles.cheStyle}>
<Image
source={require('./Images/logo-chepauk.png')}
style={styles.logoStyle} />
</View>

<View style={styles.dinStyle}>
<Image
source={require('./Images/logo-dindigul.png')}
style={styles.logoStyle} />
</View>

<View style={styles.kanStyle}>
<Image
source={require('./Images/logo-kanchi.png')}
style={styles.logoStyle} />
</View>

<View style={styles.karStyle}>
<Image
source={require('./Images/logo-karaikudi.png')}
style={styles.logoStyle} />
</View>

<View style={styles.kovStyle}>
<Image
source={require('./Images/logo-kovai.png')}
style={styles.logoStyle} />
</View>

<View style={styles.madStyle}>
<Image
source={require('./Images/logomadurai.png')}
style={styles.logoStyle} />
</View>

<View style={styles.thiStyle}>
<Image
source={require('./Images/logothiruvallur.png')}
style={styles.logoStyle} />
</View>

<View style={styles.tutStyle}>
<Image
source={require('./Images/logotuti.png')}
style={styles.logoStyle} />
</View>

</View>
</ScrollView>

);
}
}
const styles = {
viewStyle: {
flexDirection: 'row',
justifyContent: 'space-around',
// position: 'relative',
transform: [{ rotate: '-4deg' }]
},

logoStyle: {
width: 90,
height: 90,
position: 'relative',
marginLeft: 10,
marginRight: 30,
marginTop: 20
},
cheStyle: {
bottom: 20,
transform: [{ rotate: '16deg' }]
},
dinStyle: {
bottom: 15,
transform: [{ rotate: '16deg' }]
},
kanStyle: {
marginTop: -5,
transform: [{ rotate: '16deg' }]
},
karStyle: {
top: 10,
transform: [{ rotate: '17deg' }]
},
kovStyle: {
top: 10,
transform: [{ rotate: '16deg' }]
},
madStyle: {
marginTop: 25,
transform: [{ rotate: '16deg' }]
},
thiStyle: {
marginTop: 35,
transform: [{ rotate: '16deg' }]
},
tutStyle: {
marginTop: 45,
transform: [{ rotate: '16deg' }]
},
scrollViewStyle: {
transform: [{ rotate: '-12deg' }]
}
};
export default TeamScroll;

最佳答案

我已经整理好了,我满足了所有这些要求我为此使用了一个 React Native 模块

react-native-snap-carousel

我可以控制屏幕上出现的元素数量,它也可以通过动画滚动,我还可以使用我添加的每个图像的索引进行选择

查看此内容以获取有关 snap-carousel 的详细说明: https://github.com/archriss/react-native-snap-carousel

我只通过使用它更改了我的 teamscroll 组件,我还可以将一些 Prop 传递给我应用程序中的其他文件

这是我使用 snap-carousel 的 TeamScroll.js 文件

import React, { Component } from 'react';
import { View, Image, Dimensions } from 'react-native';
import Carousel from 'react-native-snap-carousel';

const { height, width } = Dimensions.get('window');

class TeamScroll extends Component {
render() {
return (
<View style={{ top: 50, }}>
<View style={{ transform: [{ rotate: '-12deg' }] }}>
<Carousel
inactiveSlideOpacity={0.7}
inactiveSlideScale={0.65}
firstItem={1}
sliderWidth={width}
itemWidth={width / 3} >
<Image
source={require('./Images/logo-chepauk.png')}
style={styles.logoStyle} />
<Image
source={require('./Images/logo-dindigul.png')}
style={styles.logoStyle} />
<Image
source={require('./Images/logo-kanchi.png')}
style={styles.logoStyle} />
<Image
source={require('./Images/logo-karaikudi.png')}
style={styles.logoStyle} />
<Image
source={require('./Images/logo-kovai.png')}
style={styles.logoStyle} />
<Image
source={require('./Images/logomadurai.png')}
style={styles.logoStyle} />
<Image
source={require('./Images/logothiruvallur.png')}
style={styles.logoStyle} />
<Image
source={require('./Images/logotuti.png')}
style={styles.logoStyle} />
</Carousel>
</View>
</View>
);
}
}
const styles = {
logoStyle: {
width: width / 3,
height: width / 3
}
};
export default TeamScroll;

关于javascript - 如何从项目列表中选择 ScrollView 中的中心项目,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45568086/

26 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com