Apple changed all sorts of shortcuts, but to switch between header and implementation, the new shortcut is,

 +  + /

You can change it back to the previous  +  + / in Preferences > Key Bindings.

Look for the Jump to Next Counterpart and Jump to Previous Counterpartcommands.

If you are working on a big screen, you could use the Assistant layout's split view, and have the .h and .m files side by side.

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