I don’t know if it has ever happend to you that to clean your iPhone Simulator instead of deleting app by app, you did a reset and found out that all pictures had dissapeared XD, what did you expect 
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Well, if you did a reset willingly, by error or to clean all the apps and data that is created while you test and test your apps, here there are a couple of tricks to add new pictures:
Photos we have on files:
To add pictures from your own files you only have to copy them into:
~/Users/<usuario>/Library/Application Support/iPhone Simulator/3.1.3/Media/DCIM/100APPLE
Where <usuario> is your user name, and maybe you have to change too the SDK version you are working with.
Note: I have seen different routes around internet, the idea is that you have to be in the iPhone Simulator folder ~/Library/Application Support/iPhone Simulator/… and add the images to Media/DCIM/100APPLE, i this last folder doesn’t exist you must create it.
Variant: You can also open Safari in your simulator and drag file by file to the webpage, then hold left click on the image till you get the option to save it. It will be added to your library.
Pictures from internet:
In case you want to add new images from internet, for example google images, you only need to do as before, click and hold on the image you want to safe in Safari to get the option to save it.
