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Asked: 2026-05-30T23:08:52+00:00

I am little confused finding C style syntax in an Objective-C project (for example

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I am little confused finding C style syntax in an Objective-C project (for example below syntax is not how method are defined in Objective-C, by the book). I am clear that this works since the code I have compiles without errors – but I am not sure how and why, this code is regular Objective-C .h,.m files. Can someone explain how this fits in? 

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
//use of round brackets 

void drawLinearGradient(CGContextRef context, CGRect rect, CGColorRef startColor, 
CGColorRef  endColor);
// C style syntax for passing params

Also this is very specific around the Core Graphics code that I have seen so far, is it allowed to write regular Objective-C methods like this also or only files with CG code…?

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1 Answer

  1. Editorial Team

    Objective-C is just a superset of C, in the same way as C++. (Both were originally implemented as preprocessors that convert the code to straight C code.) Objective-C method calls are translated to calls to the C function objc_msgSend() (and its variants) and it’s possible (though tedious) to call it directly.

    The gory details are spelled out here:

    https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html

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