how to make a class for method to work with uiviewcontroller

Question

I am thinking that how can I make a class for twitter or facebook or anything. So just I import that class to my project and it start working with one code. For example. If I use twitter framework then I have to write its functions. I just want to make a class of that funcation which will work on my all future projects by just importing it. example: Any class or anything: ``` -(void)shareOnTwitter:(NSString *)text withUrl:(NSURL *)url withImage:(UIImage *)image { // ALL TWITTER Code HERE; } ``` And in my Main viewController of any project: ``` - (IBAction)socialBtn:(id)sender { [self shareOnTwitter:@"This is Text" withUrl:nil withImage:nil]; } ``` UPDATE: Just tried Category way but no response return, any idea where I am wrong?: UIViewController+CustomMethods.h ``` #import #import @interface UIViewController (CustomMethods) -(void)shareOnTwitter:(NSString *)text withUrl:(NSURL *)url withImage:(UIImage *)image; @end ``` UIViewController+CustomMethods.…

Accepted Answer

I believe this is an instance where you can use an Objective-C feature called "Categories". A category is an extension to an already established class. For example, we can make a category for UIViewController which will add new methods to ALL UIViewController classes.

To do this, we do the following:

Make a .h file declaring prototypes:

```
@interface UIViewController (CategoryName) // EG. (Twitter)
// PROTOTYPES... EG:
-(void)shareOnTwitter:(NSString *)text withUrl:(NSURL *)url withImage:(UIImage *)image;
@end
```

And the corresponding .m file that implements them:

```
@implementation UIViewController (CategoryName)
// IMPLEMENTATIONS... EG:
-(void)shareOnTwitter:(NSString *)text withUrl:(NSURL *)url withImage:(UIImage *)image {
    // Code...
}
@end
```

(Note that when you declare a new file in XCode, it has a "Category" template that you can use.)

Now, whenever you import your .h file, UIViewController as a class will contain the methods you extended it with!

Here's a tutorial on categories that I found with a quick google search.

how to make a class for method to work with uiviewcontroller

Solution

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