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Specify the Model Class

1. Select the Classes group in the Groups & Files list.

2. Choose File > New File.

3. Choose to create a new Objective-C Class and name it Converter.

4. In Xcode, select both Converter.h and Converter.m by holding down command and clicking on each.

5. Click-and-drag both files into the Classes group in the Groups & Files list.

   Note: Organizing your project files in the various groups in the Groups & Files list is simply good practice. The default location for all .h and .m files is the Other Sources group in the Groups & Files list. It is a good idea to separate classes from non-classes (like main.m), especially in larger projects. However, the organization of your project makes no difference to the compiler.

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