Basic questions about the resource file xcode

Want to know the end of Delegate.h class files and documents Controller.h What is the difference, again, what is the difference between Delegate.m and Controller.m.
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Hungry, though some novice, but you can not pass the shoes pointing the way to die. . . .
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One is the header file, a file is to achieve class.

Delegate or Controller plus end just to standardize the naming, you can not follow
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. H is the header file,. M is the implementation file that I know of. Below is just not there in the CLASS 4 files Well, usually more is used that does not contain a delegate. The two files contain delegate is what to do with it, when you need to write in this way inside.