Display the system UI for taking a photo with the camera.

Arguments
  options (object) --
  A map of options:

  allowsEditing (boolean) -- Whether to show a UI to edit the image after it is picked. On Android the user can crop and rotate the image and on iOS simply crop it. Defaults to false.
  aspect (array) -- An array with two entries [x, y] specifying the aspect ratio to maintain if the user is allowed to edit the image (by passing allowsEditing: true). This is only applicable on Android, since on iOS the crop rectangle is always a square.
  Returns
    If the user cancelled taking a photo, returns { cancelled: true }.
    Otherwise, returns { cancelled: false, uri, width, height } where uri is a URI to the local image file (useable in a React Native Image tag) and width, height specify the dimensions of the image.

Display the system UI for choosing an image from the phone's photo library.

Arguments
  options (object) --
  A map of options:

  allowsEditing (boolean) -- Whether to show a UI to edit the image after it is picked. On Android the user can crop and rotate the image and on iOS simply crop it. Defaults to false.
  aspect (array) -- An array with two entries [x, y] specifying the aspect ratio to maintain if the user is allowed to edit the image (by passing allowsEditing: true). This is only applicable on Android, since on iOS the crop rectangle is always a square.
  Returns
    If the user cancelled the image picking, returns { cancelled: true }.
    Otherwise, returns { cancelled: false, uri, width, height } where uri is a URI to the local image file (useable in a react-native Image tag) and width, height specify the dimensions of the image.