I am using both methods in my project, can you please let me know, which one is best for in which situation?
Regards,
Sri
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I am using both methods in my project, can you please let me know, which one is best for in which situation?
Regards,
Sri
Well, completely seriously, class methods should be specific to a class, and instance methods should be specific to an instance. Think about the method in question; does it depend on instance variables? Is it referring to a specific instance of the class in question? Or is it more general than that?
Frequently, class methods are convenient ways to return instances (for example,
[NSColor redColor]is a handy class method for returning a common instance ofNSColor). On the other hand, the instance method-greenComponent(which returns the green component of an RGB color) clearly needs to refer to a specific instance (if I asked you, “how much green is in color?” that wouldn’t make sense. It’s “how much green is in this color here?” that is a reasonable question).You can also browse Apple’s class references to get a better feel for which sorts of things are class methods (+) vs. instance methods (-).