CODEWITHSUNDEEP
objective-coop
tosin
tosin

Reputation: 1179

How to share methods from other class

I tried to use protocol, but it needs to implement "makeMeDraggable" method for each 2 classes with the same content. I wish not to implement in each 2 classes and inherit implementation from Shared Class. How do I achieve it?

Code:

//--(.h)--//

@interface SharedClass : UIView;
-(void) makeMeDraggable
@end

@interface DraggableUITextView: UITextView
@end

@interface DraggableUIImageView : UIImageView
@end

@implementaion SharedClass
-(void) makeMeDraggable {
  //some code
}
@end

@implementation DraggableUITextView
@end

@implementation DraggableUIImageView 
@end

//--(.m)--//

TextView *textView = [DraggableUITextView initWithFrame:CGRectMake(0,0,50,50)];
[textView makeMeDraggable];

ImageView *imageView = [DraggableUIImageView imageNamed:@"foo.png"];
[imageView makeMeDraggable];

I want to avoid below:

@interface DraggableTextView: UITextView;
-(void) makeMeDraggable
@end

@interface DraggableUIImageView : UIImageView
-(void) makeMeDraggable
@end

@implementation DraggableUITextView
-(void) makeMeDraggable {
  //same code...
}
@end

@implementation DraggableUIImageView 
-(void) makeMeDraggable {
  //same code...
}
@end

Upvotes: 2

Views: 99

Answers (3)

Prateek Prem
Prateek Prem

Reputation: 1544

Make a UIView category and write the function there rather than SharedView.Like:

@interface UIView (UIViewCategory)
-(void) makeMeDraggable;
@end


@implementaion UIView (UIViewCategory)
-(void) makeMeDraggable {
  //some code
}
@end

Now you can use makeMeDraggable method with every object inherited from UIView class.

Upvotes: 4

fzwo
fzwo

Reputation: 9902

The way to do this is with a Category on a common superclass, in your case, UIView.

The Category extends its class with new methods, which are then available like ordinary methods to all subclasses.

Upvotes: 1

e1985
e1985

Reputation: 6279

Create a category over UIView with the method makeMeDraggable and you will be able to use it on both UITextView and UIImageView objects.

Upvotes: 1

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