Question

我正在尝试在地图顶部使用Animated.ScrollView，但没有任何显示。甚至我的5个标记都没有显示。在使用这些代码之前，它是有效的，因为我只是使用MapView而不是<SetLocationMap />组件。该地图位于SetLocationMap.js组件内部。我知道问题出在哪里，我只是不知道如何解决，我想使用我的SetLocationMap.js组件。

所以我的目标是显示Animated.ScrollView和我的5个标记。就像在图片上一样：

这是我的代码：对于EventMap.js：

this.state = {
  controls: {
    location: {
      value: null
    },
  },
  focusedLocation: {
    latitude: 0,
    longitude: 0,
    // latitudeDelta: 0.04864195044303443,
    // longitudeDelta: 0.040142817690068,
    latitudeDelta: 0.01,
    longitudeDelta: Dimensions.get('window').width / Dimensions.get('window').height * 0.01
  },
  locationChosen: false,
  markerPosition: {
    latitude: 0,
    longitude: 0
  },
  markers: [
    {
      coordinate: {
        latitude: 37.42484589323653,
        longitude: -122.08271104842426
      },
    },
    {
      coordinate: {
        latitude: 37.42019338901534,
        longitude: -122.08207536488771
      },

    },
    {
      coordinate: {
        latitude: 37.4219108525511,
        longitude: -122.08126466721296
      },
    },
    {
      coordinate: {
        latitude: 37.42190153308783,
        longitude: -122.08728086203337
      },
    },
    {
      coordinate: {
        latitude: 37.419681603891306,
        longitude: -122.08521489053966
      },
    }
  ],
}
}

  componentWillMount() {
this.index = 0;
this.animation = new Animated.Value(0);
}

componentDidMount() {
// We should detect when scrolling has stopped then animate
// We should just debounce the event listener here
this.animation.addListener(({ value }) => {
  let index = Math.floor(value / CARD_WIDTH + 0.3); // animate 30% away from landing on the next item
  if (index >= this.state.markers.length) {
    index = this.state.markers.length - 1;
  }
  if (index <= 0) {
    index = 0;
  }

  clearTimeout(this.regionTimeout);
  this.regionTimeout = setTimeout(() => {
    if (this.index !== index) {
      this.index = index;
      const { coordinate } = this.state.markers[index];
      this.map.animateToRegion(
        {
          ...coordinate,
          latitudeDelta: this.state.focusedLocation.latitudeDelta,
          longitudeDelta: this.state.focusedLocation.longitudeDelta,
        },
        350
      );
    }
  }, 10);
});
}

render() {
//For the UserMarker
let userMarker = null;
if(this.state.locationChosen) { 
  userMarker = <MapView.Marker coordinate={this.state.markerPosition} />
}

//For the Scroll View Card
const interpolations = this.state.markers.map((marker, index) => {
  const inputRange = [
    (index - 1) * CARD_WIDTH,
    index * CARD_WIDTH,
    ((index + 1) * CARD_WIDTH),
  ];
  const scale = this.animation.interpolate({
    inputRange,
    outputRange: [1, 2.5, 1],
    extrapolate: "clamp",
  });
  const opacity = this.animation.interpolate({
    inputRange,
    outputRange: [0.35, 1, 0.35],
    extrapolate: "clamp",
  });
  return { scale, opacity };
});

return(
  <View style={styles.container}>
    {/* <StatusBar backgroundColor={'transparent'} translucent={true}/> */}
    <SetLocationMap
      mapContainer={styles.container}
      onLocationPick={this.locationPickedHandler}
      // onPress={this.pickLocationHandler}
      showsUserLocation={true}
      ref={ref => this.map = ref} //For animating map movement
    >
      {userMarker}
      {this.state.markers.map((marker, index) => {
        const scaleStyle = {
          transform: [
            {
              scale: interpolations[index].scale,
            },
          ],
        };
        const opacityStyle = {
          opacity: interpolations[index].opacity,
        };
        return (
          <MapView.Marker key={index} coordinate={marker.coordinate}>
            <Animated.View style={[styles.markerWrap, opacityStyle]}>
              <Animated.View style={[styles.ring, scaleStyle]} />
                <View style={styles.marker} />
            </Animated.View>
          </MapView.Marker>
        );
      })}
    </SetLocationMap>
    <Animated.ScrollView
      horizontal
      scrollEventThrottle={1}
      pagingEnabled={true}
      showsHorizontalScrollIndicator={false}
      snapToInterval={snapInterval}
      onScroll={Animated.event(
        [
          {
            nativeEvent: {
              contentOffset: {
                x: this.animation,
              },
            },
          },
        ],
        { useNativeDriver: true }
      )}
      style={styles.scrollView}
      contentContainerStyle={styles.endPadding}
    >
      <FlatList
      keyExtractor={this._keyExtractor}
      horizontal
      data={this.props.events}
      renderItem={(info) => (
        <TouchableOpacity onPress={() => this.itemSelectedHandler(info.item.key)}>
          <View style={styles.card} key={info.item.key}>
            <Image
              source={info.item.image}
              style={styles.cardImage}
              resizeMode="cover"
            />
            <View style={styles.textContent}>
              <Text numberOfLines={1} style={styles.cardtitle}>{info.item.name}</Text>
              <Text numberOfLines={1} style={styles.cardDescription}>
                {info.item.description}
              </Text>
            </View>
          </View>
        </TouchableOpacity>
      )}
    />
    </Animated.ScrollView>
    <TouchableOpacity onPress={this.getLocationHandler} style={styles.iconContainer}>
      <Icon name="md-locate" size={30} color="blue"/>
    </TouchableOpacity>
  </View>
);
}
}

const styles = StyleSheet.create({
container: {
  flex: 1
},
iconContainer: {
position: 'absolute',
top: 60,
right: 15,
zIndex: 1
},
//--- Style for Marker -----//
scrollView: {
position: "absolute",
bottom: 0,
left: 0,
right: 0,
paddingVertical: 8,
},
endPadding: {
paddingRight: width - CARD_WIDTH,
paddingBottom: 23
},
markerWrap: {
alignItems: "center",
justifyContent: "center",
},
marker: {
width: 8,
height: 8,
borderRadius: 4,
backgroundColor: "rgba(130,4,150, 0.9)",
},
ring: {
width: 24,
height: 24,
borderRadius: 12,
backgroundColor: "rgba(130,4,150, 0.3)",
position: "absolute",
borderWidth: 1,
borderColor: "rgba(130,4,150, 0.5)",
},
cardtitle: {
fontSize: 12,
marginTop: 5,
fontWeight: "bold",
},
cardDescription: {
fontSize: 12,
color: "#444",
},
card: {
elevation: 2,
backgroundColor: "#FFF",
marginHorizontal: 10,
shadowColor: "#000",
shadowRadius: 5,
shadowOpacity: 0.3,
shadowOffset: { x: 2, y: -2 },
height: CARD_HEIGHT,
width: CARD_WIDTH,
overflow: "hidden",
borderRadius: 4,
// height: 210,
// width: 350
},
cardImage: {
flex: 3,
width: "100%",
height: "100%",
alignSelf: "center",
},
textContent: {
flex: 1,
paddingLeft: 4,
paddingRight: 4
},
})

对于SetLocationMap.js：

  render() {
let marker = null;
if(this.state.locationChosen) {
  marker = <MapView.Marker coordinate={this.state.focusedLocation} flat={true}/>
}
return(
  <View style={this.props.mapContainer}>
    {/* <TouchableOpacity onPress={this.getLocationHandler} style={styles.iconContainer}>
      <Icon name="md-locate" size={30} color="blue"/>
    </TouchableOpacity> */}
    <MapView
      {...this.props}
      style={styles.map}
      initialRegion={this.state.focusedLocation}
      onPress={this.pickLocationHandler}
      ref={ref => this.map = ref} //For animating map movement
    >
      {marker}
    </MapView>
  </View>
);
}

const styles = StyleSheet.create({
map: {
position: 'absolute',
top: 0,
left: 0,
right: 0,
bottom: 0,
...StyleSheet.absoluteFillObject
},
iconContainer: {
position: 'absolute',
top: 100,
right: 20,
zIndex: 2,
},
})

React Native-Animated.ScrollView没有显示在我的地图上

0 个答案: