A quick way of taking a Screen shot in the iPhone simulator instead of using cmd + 3 etc. go to File -> Save Screen Shot or Cmd + S. Remember to have the simulator selected so you get the correct menu. The image will be save on the desktop on your mac.
Mac’s brightness is set to automatically dim and adjust the brightness in different situations. This is however very annoying sometimes when having multiple external screen connected, then the mac screen will dim itself. To remove this unwanted feature go to the System Preferences -> Display. Here untick “Automatically adjust brightness”. Set the brightness level you
Taking a picture of your iPhone screen is quick and painless. Press and hold the Home button, then press the Sleep/Wake button. Your screen flashes and the picture appears in your Camera Roll.