实现对现有动画标签栏的反应导航

Question

我有一个带有 react-native-reanimated 的自定义动画标签栏组件。我试图通过反应导航来实现它但是当我做动画时不起作用。对添加内容以使其正常运行的任何帮助。这是组件选项卡组件

interface TabProps {
  children: ReactElement;
  onPress: () => void;
  // navigation: NavigationStackScreenProps<any, any>;
  active: Animated.Node<number>;
  transition: Animated.Node<number>;
  index: number;
  label: string;
}

const styles = StyleSheet.create({
  icon: {
    overflow: 'hidden',
  },
});

export default ({
  children,
  active,
  transition,
  index,
  onPress,
}: TabProps) => {
  const isActive = eq(active, index);

  const activeTransition = withTransition(isActive, {duration: DURATION});
  const isGoingLeft = greaterThan(transition, active);
  const width = interpolateNode(activeTransition, {
    inputRange: [0, 1],
    outputRange: [0, ICON_SIZE],
  });
  const direction = cond(
    isActive,
    cond(isGoingLeft, 'rtl', 'ltr'),
    cond(isGoingLeft, 'ltr', 'rtl'),
  );

  return (
    <TouchableWithoutFeedback {...{onPress}}>
      <Animated.View
        style={{
          width: ICON_SIZE,
          height: ICON_SIZE,
          direction
        }}>
        <View style={StyleSheet.absoluteFill}>{children}</View>
        <Animated.View style={[styles.icon, {width}]}>
          {cloneElement(children, {active: true})}
        </Animated.View>
      </Animated.View>
    </TouchableWithoutFeedback>
  );
};

标签栏索引：

const tabs = [
  {icon: <Home />, label: 'Home'},
  {icon: <User />, label: 'Video'},
  {icon: <Tv />, label: 'LiveStream'},
  {icon: <Wallet />, label: 'Signin'},
];
const styles = StyleSheet.create({
  container: {
    backgroundColor: '#F0F0F6',
    width: '90%',
    position: 'absolute',
    bottom: 20,
    left: '5%',
    borderRadius: 10,
  },
  tabs: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
  },
  tab: {
    width: SEGMENT / 1.2,
    height: ICON_SIZE + PADDING * 2,
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
  },
});

export default ({...props}) => {
  const active = new Value<number>(0);
  let navigation = useNavigation();
  const transition = withTransition(active, {duration: DURATION});
  const activeTransition = new Value(0);
  useCode(
    () =>
      block([
        onChange(active, set(activeTransition, 0)),
        set(activeTransition, timing({duration: DURATION})),
      ]),
    [active, activeTransition],
  );
  return (
    <SafeAreaView style={styles.container}>
      <View style={styles.tabs}>
        {tabs.map(({icon, label}, index) => (
          <View key={index} style={styles.tab}>
            <Weave {...{active, transition, index}} />
            <Tab
              onPress={() => {
                active.setValue(index);
                console.log(active);
                // title.setValue(label);
                props.navigation.navigate(label);
              }}
              {...{active, transition, index, label}}>
              {icon}
            </Tab>
          </View>
        ))}
        <Particules {...{transition, activeTransition}} />
      </View>
    </SafeAreaView>
  );
};

这是我试图复制的运球示例https://dribbble.com/shots/5380015-WeChat-Tab-Bar-Redesign

Answer 1

您使用的 react-native-reanimated 和 react-native 是什么版本？我发现有几件事应该会导致问题，但我也不完全确定哪些内容适用于您的版本。

我看到的最重要的事情是您在组件的每个渲染器上实例化新的 Value 对象，如果尝试以功能方式设置动画，这应该会导致问题。稍微研究 react-native-reanimated 似乎有一些挂钩 (useValue and useSharedValue) 应该为您提供一个一致的对象，您可以在适用的地方使用。看起来您需要使用 useValue.

由于动画会给您带来麻烦，因此使用 the examples provided in their fundamentals as good reference for side-by-side comparison. This could be especially useful if you had/have it working as a class component to compare the differences. As well as their useAnimatedStyle 钩子来了解它们如何处理功能组件中的动画可能是个好主意。

其他一些注意事项

您可能需要将 timing 调用替换为 withTiming. timing 似乎特定于 v1
而不是使用 set，您可能想要 useSharedValue 并只分配给共享值的 value 属性。 set 似乎也专门针对 reanimated

// useSharedValue is provided by "react-native-reanimated"
const active = useSharedValue(0);
const activeTransition = useSharedValue(0);

// useEffect is provided by "react"
useEffect(() => {
  // Set activeTransition to 0
  activeTransition.value = 0;
}, [active.value]); // When active.value changes

希望这对您有所帮助

实现对现有动画标签栏的反应导航

Implement react navigation to an existing animated tabbar

javascript

react-native

react-native-reanimated

react-native-reanimated-v2