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Because .o and .c were taken. Simple as that.

I always thought that there was an m in implementation, so it became .m. But most of the sayings on the Internet are the abbreviation of methods or message!

I have never struggled with this, but I know that the suffix of Objective-C source files is .m. That’s it, why bother?

Why don’t you google this question first before asking it? Answer

.m file: message file (message, also called implementation file).

The data implementation mechanism of objective-c is the same as the message sending implementation mechanism of smalltalk. Therefore, the code implemented in objective-c is saved in the .m (message) abbreviated suffix file to indicate the role and function of this file. use.

method or message