Make your Person class KVO-compliant for the image property. If the
object has not yet downloaded and cached it's image, have its -image
method return a generic placeholder image (or nil) and start a
background fetch. When the download is complete, have it call -
setImage: on the Person for whom it was requested.
Now anyone who is a registered KVO observer of that object's image
property will be notified when the download is complete.
--Kyle Sluder
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