react-native-deck-swiper error is TypeError: undefined is not an object (evaluating 'cards.length')

Question

参考https://snack.expo.io/rJBRhOLU-

创建

const cardOne = require("../../image/doginfo-1.png");
const cardTwo = require("../../image/doginfo-2.png");
const cardThree = require("../../image/doginfo-3.png");
const cardFour = require("../../image/doginfo-4.png");

class AdvancedDeck extends Component {
  constructor(props) {
    super(props);
    this.sate = {
      cardIndex: 0,
      swipedAllCards: false,
      swipeDirection: "",
      cards: [
        {
          text: "Card One",
          name: "One",
          image: cardOne
        },
        {
          text: "Card Two",
          name: "Two",
          image: cardTwo
        },
        {
          text: "Card Three",
          name: "Three",
          image: cardThree
        },
        {
          text: "Card Four",
          name: "Four",
          image: cardFour
        }
      ]
    };
  }
  renderCard = (card, index) => {
    return (
      <Card style={{ elevation: 3 }}>
        <CardItem>
          <Left>
            <Thumbnail source={card.image} />
            <Body>
              <Text>{card.text}</Text>
              <Text note>NativeBase</Text>
            </Body>
          </Left>
        </CardItem>
        <CardItem cardBody>
          <Image
            style={{
              resizeMode: "cover",
              width: null,
              flex: 1,
              height: 300
            }}
            source={card.image}
          />
        </CardItem>
        <CardItem>
          <IconNB name={"ios-heart"} style={{ color: "#ED4A6A" }} />
          <Text>
            {card.name}-{index}
          </Text>
        </CardItem>
      </Card>
    );
  };

  onSwipedAllCards = () => {
    this.setState({
      swipedAllCards: true
    });
  };

  swipeLeft = () => {
    this.swiper.swipeLeft();
  };

  render() {
    return (
      <Container style={styles.container}>
        <Header>
          <Left>
            <Button transparent onPress={() => this.props.navigation.goBack()}>
              <Icon name="arrow-back" />
            </Button>
          </Left>
          <Body>
            <Title>Advanced Deck Swiper</Title>
          </Body>
          <Right />
        </Header>

        <View style={{ flex: 1, padding: 12 }}>
          <Swiper
            ref={swiper => {
              this.swiper = swiper;
            }}
            onSwiped={this.onSwiped}
            onSwipedLeft={() => this.onSwiped("left")}
            onSwipedRight={() => this.onSwiped("right")}
            onSwipedTop={() => this.onSwiped("top")}
            onSwipedBottom={() => this.onSwiped("bottom")}
            onTapCard={this.swipeLeft}
            cards={this.props.cards}
            cardIndex={this.props.cardIndex}
            cardVerticalMargin={80}
            renderCard={this.renderCard}
            onSwipedAll={this.onSwipedAllCards}
            showSecondCard={false}
            stackSize={3}
            stackSeparation={15}
            overlayLabels={{
              bottom: {
                title: "BLEAH",
                style: {
                  label: {
                    backgroundColor: "black",
                    borderColor: "black",
                    color: "white",
                    borderWidth: 1
                  },
                  wrapper: {
                    flexDirection: "column",
                    alignItems: "center",
                    justifyContent: "center"
                  }
                }
              },
              left: {
                title: "NOPE",
                style: {
                  label: {
                    backgroundColor: "black",
                    borderColor: "black",
                    color: "white",
                    borderWidth: 1
                  },
                  wrapper: {
                    flexDirection: "column",
                    alignItems: "flex-end",
                    justifyContent: "flex-start",
                    marginTop: 30,
                    marginLeft: -30
                  }
                }
              },
              right: {
                title: "LIKE",
                style: {
                  label: {
                    backgroundColor: "black",
                    borderColor: "black",
                    color: "white",
                    borderWidth: 1
                  },
                  wrapper: {
                    flexDirection: "column",
                    alignItems: "flex-start",
                    justifyContent: "flex-start",
                    marginTop: 30,
                    marginLeft: 30
                  }
                }
              },
              top: {
                title: "SUPER LIKE",
                style: {
                  label: {
                    backgroundColor: "black",
                    borderColor: "black",
                    color: "white",
                    borderWidth: 1
                  },
                  wrapper: {
                    flexDirection: "column",
                    alignItems: "center",
                    justifyContent: "center"
                  }
                }
              }
            }}
            animateOverlayLabelsOpacity
            animateCardOpacity
            swipeBackCard
          />
        </View>
        <View
          style={{
            flexDirection: "row",
            flex: 1,
            position: "absolute",
            bottom: 50,
            left: 0,
            right: 0,
            justifyContent: "space-between",
            padding: 15
          }}
        >
          <Button
            style={{ backgroundColor: "black" }}
            onPress={() => this.swiper.swipeBack()}
            title="Swipe Back"
          >
            <Icon name="arrow-back" />
            <Text>Swipe Left</Text>
          </Button>
          <Button iconRight onPress={() => this._deckSwiper._root.swipeRight()}>
            <Text>Swipe Right</Text>
            <Icon name="arrow-forward" />
          </Button>
        </View>
      </Container>
    );
  }
}

export default AdvancedDeck;

我该如何解决？
我将代码更改为 contact-native-check-swiper 以写回按钮，因为在编写现有的默认基础 checkswiper 时它没有变成后退按钮。
欢迎任何回答。请多多帮助。

Answer 1

问题出在

<Swiper
...
cards={this.props.cards}
...

您在 this.state = { cards: ... } 中定义了卡片

react-native-deck-swiper error is TypeError: undefined is not an object (evaluating 'cards.length')

react-native-deck-swiper error is TypeError: undefined is not an object (evaluating 'cards.length')

swiper

react-native

expo

react-native-swiper