I have been trying refactor code by thanking functions and adding them in a separate file extension of a ViewController What I have in this extension is a function that adds gesture recognizers t...

I'm slowly building my personal website over at dlblack.dev, and I'm trying to spice it up a little bit. For example, from a computer (rather than a tablet or phone since they don't have mouse poin...

I'm using a third-party library for a new app that I'm making using Swift. The author of the class/library has made it final using the final keyword, probably to optimise and to prevent overriding ...

I'd like to add some functions to the Array class (I'd rather not have them as functions external to the class since it would ideally be discoverable when typing . following the object). This is wh...

Is there anyhow anyway to add some static method to types like Date, String, Array, etc? For example I want to add method today to Date class and in JavaScript I can simply add a property to it or...

Is it possible to dynamically extend a class object in PHP? And what would be the most elegant way of doing this? Some example code for further explanation: class BasicClass { private $variable...

The following is a code snippet which deals with class extensions. What I am trying to do is generate a random ID called internal ID (that is used by the program later on) which is stored in an enc...

I'am using a third-party framework that provides a class whose instances only have properties. In my app, I'd like to add an extra property to this instances. What the appropriate way to do this wo...

Class extensions @interface Class () are a lot more powerful and can inject variables into the class. Categories @interface Class (Category) can't. What other differences are there, and when shou...

I don't understand why programmers use the extension keyword in their class implementation. You can read in other topics that code is then more semantically separated and etc. But when I work with ...

See this similar question: Need access more user properties in User.Identity I would like to create custom authentication methods to use with my Razor Views that allows easy access IdentityUser pro...

I'm writing a library, which will potentially be used by people that aren't me. Let's say I write a class: InterestingClass.h @interface InterestingClass: NSObject - (id)initWithIdentifier:(NSSt...

As a fairly new objective-c programmer (with a 4 years Java experience), I seem to be having a hard time understanding when to use class extensions. From what I understood (and please, correct me i...

Say I have 2 classes: Money and Dollar, where Dollar inherits from Money. Money has a property declared in a class extension: #import "Money.h" @interface Money () @property(nonatomic) NSUIntege...

I have the following class interface: @interface MyClass : NSObject @property int publicProperty; @end then the implementation: @interface MyClass() // class extension - (void)privateMethod;...

I've been declaring private methods in class extensions, according to Best way to define private methods for a class in Objective-C. But, I just realized that, in Xcode 4, if I leave out the decla...

I've been looking at Apple's MVCNetworking example project and part of the interface definition for AppDelegate is puzzling me. In the .h file we have this: @interface AppDelegate : NSObject { .....

I believe a popular way to declare "private methods" in Objective-C is to create its class extension and declare methods that you would like to make as private. I would like to know more in detail...

Would it make any sense to put class extensions in their own .h files and #import them selectively to get various levels of visibility for a class' methods and properties? If this is a bad idea (or...

There are several situations where you might override a super class's property. You declare a property with the same name and same attribute of its superclass'.(since if you change the attribute ...