This function helps with the creation of the iOS parameter structure in the JSON request. Further details can be found in the realfavicongenerator.net API documentation
ios_helper( picture_aspect = c("no_change", "background_and_margin"), margin = NULL, background_colour = NULL, startup_image = NULL, app_name = NULL, assets = list(ios6_and_prior_icons = FALSE, ios7_and_later_icons = TRUE, precomposed_icons = FALSE, declare_only_default_icon = TRUE) )
character; one of 'no_change' or 'background_and_margin'. 'no_change' leaves the picture as is, 'background_and_margin' uses the background_color and margin parameters.
character; margin of picture in pixels or as a percentage
list; list containing details of startup image to use (created via
character; when defined, will be used by Safari as the default home screen caption instead of page title
list; list of asset parameters. These define which icons to include. Options to be set to TRUE or FALSE are 'ios6_and_prior_icons', 'ios7_and_later_icons', 'precomposed_icons' and 'declare_only_default_icon'.
character; background color applied to the background of the Apple Touch icon. Hex value.