If you are targeting iOS 9.0 or OS X v10.11, you may be running into Apple's App Transport Security. Running your code while targeting these operating system versions, the following output will be displayed int console:
App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.
Apple now requires you to only access files via https or to allow non-https (ie. http) exceptions via info.plist.
If you haven't already, I'd suggest updating your info.plist.
You can do this on a per domain basis, or allow arbitrary loading of non-https url.
For example, update your info.plist with the following keys/values:

If this is your issue, once your info.plist is updated, your code should work.
IBOutletconnection with imageView?