Optional: Creating a Clean Slate
The following steps remove some Interface Builder odds and ends from the project;
this is optional, but it’s something I like to do to start from a clean slate.
1. Interface Builder uses an XML file called a xib for defining an object graph of UI
elements. Since you’re creating a pure OpenGL application, you don’t need this
file in your project. In the Groups & Files pane on the left, find the folder that says
Resources (or something similar such as Re......
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