Here is what works for me:
#!/bin/bash
# `menu_click`, by Jacob Rus, September 2006
#
# Accepts a list of form: `{"Finder", "View", "Arrange By", "Date"}`
# Execute the specified menu item. In this case, assuming the Finder
# is the active application, arranging the frontmost folder by date.
osascript <<SCRIPT
on menu_click(mList)
local appName, topMenu, r
-- Validate our input
if mList's length < 3 then error "Menu list is not long enough"
-- Set these variables for clarity and brevity later on
set {appName, topMenu} to (items 1 through 2 of mList)
set r to (items 3 through (mList's length) of mList)
-- This overly-long line calls the menu_recurse function with
-- two arguments: r, and a reference to the top-level menu
tell application "System Events" to my menu_click_recurse(r, ((process appName)'s ¬
(menu bar 1)'s (menu bar item topMenu)'s (menu topMenu)))
end menu_click
on menu_click_recurse(mList, parentObject)
local f, r
-- `f` = first item, `r` = rest of items
set f to item 1 of mList
if mList's length > 1 then set r to (items 2 through (mList's length) of mList)
-- either actually click the menu item, or recurse again
tell application "System Events"
if mList's length is 1 then
click parentObject's menu item f
else
my menu_click_recurse(r, (parentObject's (menu item f)'s (menu f)))
end if
end tell
end menu_click_recurse
application "iPhone Simulator" activate
menu_click({"iPhone Simulator", "iOS Simulator", "Reset Content and Settings…"})
tell application "System Events"
tell process "iPhone Simulator"
tell window 1
click button "Reset"
end tell
end tell
end tell
SCRIPT
Taken from: https://stackoverflow.com/a/14811280/1041311
Also note that it wonk work for the first time, since you need to allow Xcode to modify folders. At first run there will be dialog which will take you to System preferences where you need to give Xcode that permissions.