IOS Swift to retrieve data liner from webpage : Need help here..

my webpage displays a constructive data in a single line, specifically to let xcode to retrieve it.

[{"long":"1234..45","lat":"345.12"}]

this information is in a page 
Click here to see "www.gogrex.com/Sandbox/startloc.json"


How do I retrieve it into my xcode as a JSON? I have looked thru many examples but still cannot solve it.

thanks a million




