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我已经阅读了几篇关于何时使用和何时不使用的文章，useCallback但useMemo我大多看到的是非常contrived代码。我在查看我公司的代码时发现有人这样做了：

const takePhoto = useCallback(() => {
    launchCamera({ mediaType: "photo", cameraType: "front" }, onPickImage);
  }, []);

  const pickPhotoFromLibrary = async () => {
    launchImageLibrary({ mediaType: "photo" }, onPickImage);
  }

  const onUploadPress = useCallback(() => {
    Alert.alert(
      "Upload Photo",
      "From where would you like to take your photo?",
      [
        { text: "Camera", onPress: () => takePhoto() },
        { text: "Library", onPress: () => pickPhotoFromLibrary() },
      ]
    );
  }, [pickPhotoFromLibrary, takePhoto]);

这是 onUploadPress 的调用方式：

<TouchableOpacity
   style={styles.retakeButton} …