Beginning Firebase - Part 8: Reading Data Challenge | Ray Wenderlich

In your next challenge, you'll read some data from Firebase. I'll get you started and you'll finish the rest.

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I am getting a crash everytime I run the examples.
Fatal error : unexpectedly found nil while unwrapping optional value

What line of code is producing the error?

Hi , I am facing issue while there is no internet connection. Is there any callback provided by firebase to check internet/server error…
There is alternative way I can check internet connection by //Reachability.isConnectedToNetwork() But I think this is not best way … Is there any better approach ?

The api points to something similar in the web interface. I haven’t checked the IOS SDK, but this should get you started: