如何在视图上渲染阴影?我尝试了很多shadowColor,shadowOffset,shadowOpacity和shadowRadius的组合,它们似乎什么都不做。我确信风格已正确应用,因为我设置了其他属性。
答案 0 :(得分:76)
我使用的是React-Native 0.40,以下代码适用于我。
(需要提升才能在其上投下阴影)
class MainApp extends Component {
render() {
return (
<View style={styles.container}>
<View elevation={5} style={styles.buttonContainer}>
<Text style={styles.textStyle}>Shadow Applied</Text>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#FFFFFF'
},
textStyle: {
color: '#FFFFFF'
},
buttonContainer: {
backgroundColor: '#2E9298',
borderRadius: 10,
padding: 10,
shadowColor: '#000000',
shadowOffset: {
width: 0,
height: 3
},
shadowRadius: 5,
shadowOpacity: 1.0
}
})
在iPhone上测试。
https://github.com/John-Nagle/pasv/blob/master/src/CPC4/defmac.l
答案 1 :(得分:29)
使用高程在RN Android上实现阴影。 Added elevation prop #27
<View elevation={5}>
</View>
答案 2 :(得分:13)
根据CALayer doc,似乎是React原生中的一个错误,shadowOpacity
设置为CGFloat
而不是float
。在修复之前使用iPhone 5模拟器。 (CGFloat
在旧设备中为float
。)
跟踪此问题的React Native问题是:
答案 3 :(得分:12)
viewStyle : {
backgroundColor: '#F8F8F8',
justifyContent: 'center',
alignItems: 'center',
height: 60,
paddingTop: 15,
shadowColor: '#000',
shadowOffset: { width: 0, height: 2 },
shadowOpacity: 0.2,
marginBottom: 10,
elevation: 2,
position: 'relative'
},
使用marginBottom:10
答案 4 :(得分:11)
您必须为View
提供提升道具<View elevation={5} style={styles.container}>
<Text>Hello World !</Text>
</View>
可以像这样添加样式:
const styles = StyleSheet.create({
container:{
padding:20,
backgroundColor:'#d9d9d9',
shadowColor: "#000000",
shadowOpacity: 0.8,
shadowRadius: 2,
shadowOffset: {
height: 1,
width: 1
}
},
})
答案 5 :(得分:8)
panel: {
// ios
backgroundColor: '#03A9F4',
alignItems: 'center',
shadowOffset: {width: 0, height: 13},
shadowOpacity: 0.3,
shadowRadius: 6,
// android (Android +5.0)
elevation: 3,
}
或者你可以使用react-native-shadow用于安卓
答案 6 :(得分:6)
所有关于利润
这适用于Android,但未在ios中测试
import React, { PureComponent } from 'react'
import PropTypes from 'prop-types'
import { View, Platform } from 'react-native'
import EStyleSheet from 'react-native-extended-stylesheet'
const styles = EStyleSheet.create({
wrapper: {
margin: '-1.4rem'
},
shadow: {
padding: '1.4rem',
margin: '1.4rem',
borderRadius: 4,
borderWidth: 0,
borderColor: 'transparent',
...Platform.select({
ios: {
shadowColor: 'rgba(0,0,0, 0.4)',
shadowOffset: { height: 1, width: 1 },
shadowOpacity: 0.7,
shadowRadius: '1.4rem'
},
android: {
elevation: '1.4rem'
}
})
},
container: {
padding: 10,
margin: '-1.4rem',
borderRadius: 4,
borderWidth: 0,
borderColor: '#Fff',
backgroundColor: '#fff'
}
})
class ShadowWrapper extends PureComponent {
static propTypes = {
children: PropTypes.oneOfType([
PropTypes.element,
PropTypes.node,
PropTypes.arrayOf(PropTypes.element)
]).isRequired
}
render () {
return (
View style={styles.wrapper}
View style={styles.shadow}
View style={styles.container}
{this.props.children}
View
View
View
)
}
}
export default ShadowWrapper
答案 7 :(得分:0)
通过样式化组件
const StyledView = styled.View`
border-width: 1;
border-radius: 2;
border-color: #ddd;
border-bottom-width: 0;
shadow-color: #000;
shadow-offset: {width: 0, height: 2};
shadow-opacity: 0.8;
shadow-radius: 2;
elevation: 1;
`
或按样式
const styles = StyleSheet.create({
containerStyle: {
borderWidth: 1,
borderRadius: 2,
borderColor: '#ddd',
borderBottomWidth: 0,
shadowColor: '#000',
shadowOffset: { width: 0, height: 2 },
shadowOpacity: 0.8,
shadowRadius: 2,
elevation: 1,
marginLeft: 5,
marginRight: 5,
marginTop: 10,
}
})
答案 8 :(得分:0)
我正在使用样式化组件,并为自己创建了一个辅助函数。
它采用给定的Android高程并创建相当等效的iOS阴影。
class ChildComponenet {
// ...
constrcutor(private appService: AppService) {}
ngOnInit() {
// ...
this.appService.menuItems$.new(['home', 'about']);
}
}
import { css } from 'styled-components/native';
/*
REMINDER!!!!!!!!!!!!!
Shadows do not show up on iOS if `overflow: hidden` is used.
https://react-native.canny.io/feature-requests/p/shadow-does-not-appear-if-overflow-hidden-is-set-on-ios
*/
// eslint-disable-next-line import/prefer-default-export
export const crossPlatformElevation = (elevation: number = 0) => css`
/* Android - native default is 4, we're setting to 0 to match iOS. */
elevation: ${elevation};
/* iOS - default is no shadow. Only add if above zero */
${elevation > 0
&& css`
shadow-color: black;
shadow-offset: 0px ${0.5 * elevation}px;
shadow-opacity: 0.3;
shadow-radius: ${0.8 * elevation}px;
`}
`;