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LazyHStack
一个用于惰性水平布局的 SwiftUI LazyHStack 组件。
iOS
tvOS
Included in Expo Go
Expo UI LazyHStack 与官方 SwiftUI LazyHStack API 保持一致,并水平排列其子项,仅在需要时创建项目(当它们在滚动过程中变为可见时)。
LazyHStack目前还不是真正的懒加载:原生端只会构建可见项,但 React 仍会一次性创建所有子项,因此大型列表的挂载可能会很慢。我们正在改进这一点。对于大型列表,我们建议使用 FlashList 或 Legend List。
安装
Terminal
- npx expo install @expo/uiIf you are installing this in an existing React Native app, make sure to install expo in your project.
用法
基本的懒加载水平堆栈
LazyHStack 应该放在带有 axes="horizontal" 的 ScrollView 内,以启用懒加载渲染。
BasicLazyHStackExample.tsx
import { Host, ScrollView, LazyHStack, Text } from '@expo/ui/swift-ui'; export default function BasicLazyHStackExample() { return ( <Host style={{ flex: 1 }}> <ScrollView axes="horizontal"> <LazyHStack spacing={12}> {Array.from({ length: 100 }, (_, i) => ( <Text key={i}>{`项目 ${i}`}</Text> ))} </LazyHStack> </ScrollView> </Host> ); }
带对齐方式
alignment 属性控制子项的垂直对齐方式。可用选项有:top、center、bottom、firstTextBaseline 和 lastTextBaseline。
LazyHStackAlignmentExample.tsx
import { Host, ScrollView, LazyHStack, Rectangle } from '@expo/ui/swift-ui'; import { frame } from '@expo/ui/swift-ui/modifiers'; export default function LazyHStackAlignmentExample() { return ( <Host style={{ flex: 1 }}> <ScrollView axes="horizontal"> <LazyHStack spacing={12} alignment="top"> <Rectangle modifiers={[frame({ width: 50, height: 50 })]} /> <Rectangle modifiers={[frame({ width: 50, height: 100 })]} /> <Rectangle modifiers={[frame({ width: 50, height: 75 })]} /> </LazyHStack> </ScrollView> </Host> ); }
API
import { LazyHStack } from '@expo/ui/swift-ui';
Component
Type: React.Element<LazyHStackProps>
Optional • Literal type:
stringThe vertical alignment of children within the stack.
Acceptable values are: 'center' | 'top' | 'bottom' | 'firstTextBaseline' | 'lastTextBaseline'
Type:
ReactNode