Keyboard shortcut to select current line in Xcode

You can actually assign a key command to this. In Xcode under Preferences > Key Bindings > Text search for "Select Line" and assign it to you preferred key command (I also prefer command-l to match Sublime Text)

Actually you can just use the normal Mac-Shortcuts.

Beginning of Line
cmd + shift + >

Middle of Line
1. cmd + > (this brings you to the end of the line)
2. cmd + shift + < (selects everything to the left)

End of Line
cmd + shift + <

Hope this helps :)

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Update

In Xcode 8, I have found the Select Line keyboard binding which you can set to cmd+l (that's L, not i) for instance to make Xcode select the line you're on right now when hitting that shortcut.