1 Flexbox布局
1) flexDirection
可以决定布局的主轴,子元素是应该沿着水平轴(row)方向排列,还是沿着竖直轴(column)方向排列
2) justifyContent
决定其子元素沿着次轴(与主轴垂直的轴,比如若主轴方向为row,则次轴方向为column)的排列方式
有flex-start、center、flex-end、space-around、space-between以及space-evenly
3) alignItems
子元素沿着次轴(与主轴垂直的轴,比如若主轴方向为row,则次轴方向为column)的排列方式。子元素是应该靠近次轴的起始端还是末尾段分布,可选项有:flex-start、center、flex-end以及stretch,这里strech是延伸的意思
2 简单代码测试
render() { return ( <View style={{flex: 1, flexDirection: 'column', justifyContent: 'center', alignItems: 'stretch',}}> <View style={{height: 50, backgroundColor: 'powderblue'}} /> <View style={{height: 50, backgroundColor: 'skyblue'}} /> <View style={{height: 100, backgroundColor: 'steelblue'}} /> </View> ); }
效果如下
render() { let pic = {uri: 'https://upload.wikimedia.org/wikipedia/commons/d/de/Bananavarieties.jpg'}; return ( <View style={{flex: 1, flexDirection: 'column', justifyContent: 'center', alignItems: 'flex-end'}}> <View style={{width: 50, height: 50, backgroundColor: 'powderblue'}} /> <View style={{width: 50, height: 50, backgroundColor: 'skyblue'}} /> <View style={{width: 50, height: 50, backgroundColor: 'steelblue'}} /> </View> ); }
render() { return ( <View style={{padding: 10}}> <TextInput style={{height: 40}} placeholder="hello" onChangeText={(text) => this.setState({textValue:text})} /> <Text style={styles.instructions}>{this.state.textValue}</Text> </View> ); }