Question

Is there a way to access a method from an other class without creating an object in Objective-C?

Answer 1

I suspect you are really looking for class methods; Objective-C’s equivalent to other languages’ static methods. See: What is the difference between class and instance methods?

To define one:

@implementation MONObject
+ (void)classMethod { ... }
@end

In use: [MONObject classMethod]

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If you want the instance method as a callable C function, see class_getInstanceMethod, or simply IMP imp = [MONClass instanceMethodForSelector:@selector(someSelector)];.