Xcode

Development Tools
Build & Run
+B Build mac
+R Run mac
+U Run tests mac
+. Stop build or run mac
+⇧ Shift+K Clean build folder mac
Navigation
+⇧ Shift+O Open Quickly (search files, symbols) mac
+⇧ Shift+F Find in project mac
+F Find in file mac
CTRL++ Navigate back mac
CTRL++ Navigate forward mac
Editing
+/ Toggle comment mac
CTRL+I Re-indent selected code mac
+Z Undo mac
+⇧ Shift+Z Redo mac
+A Select all mac
Panels & UI
+0 Show / hide Navigator (left panel) mac
++0 Show / hide Inspector (right panel) mac
+⇧ Shift+Y Show / hide Debug area mac