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Set Xcode to Your Preferences
Xcode comes with nine categories of preferences — each of which comes with its own subset of modifications you can make to change the way Xcode does everything it does. You should look over all of these to make sure Xcode is behaving as you want it to behave, instead of just acting the way the Apple defaults want Xcode to behave. The little things you can do with Xcode’s preferences can make your software development experience much better. I have my favorite formatting preferences all set to my proper specifications; I also make use of code coloring to give me the best display of my code. You should at least play around with the settings in Fonts & Colors to come up with your favorite: definitely cycle through the different themes, such as Presentation and Midnight. Presentation is starting to appeal to me personally, since my eyesight is getting incrementally worse. But Midnight looks pretty cool, too.