Method from parent class

[jvpython]

I have a UITableView cell which responds to events like a slider's value changes etc... On certain occasions I need to run a method from the parent class when the user does things with the UITableView cell controls. I cant seem to access methods from my parent class. Is it possible? Thanks

[baja_yu]

A subclass inherits methods from its superclass so this shouldn't be a problem. What method are you talking about?

[jvpython]

Originally Posted by baja_yu

A subclass inherits methods from its superclass so this shouldn't be a problem. What method are you talking about?

Any method from the parent class. Lets say I have a method:

- (void) aMethod {
    //code
}

How would I access it from a subclass?

[Duncan C]

Originally Posted by jvpython

Any method from the parent class. Lets say I have a method:

- (void) aMethod {
    //code
}

How would I access it from a subclass?

You would just call it like this:

[super aMethod];

The keyword "super" sends a message to the ancestor(s) of the current object. That's what the line

self = [super init];

that you see in init routines does. It invokes the super-class's init routine.

[jvpython]

I tried this but when I build it the compiler says it may not respond to that method and the app crashes. What could be causing this?

[JasonR]

We need to see how your class is defined to help you. Can you at least post the beginning of the .h file that shows how you defined the class?

[jvpython]

Originally Posted by JasonR

We need to see how your class is defined to help you. Can you at least post the beginning of the .h file that shows how you defined the class?

Sure

Super Class:

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>
#import <MediaPlayer/MediaPlayer.h>
#import "SubClass.h"

@interface SuperClass : UIViewController <UIActionSheetDelegate, UITableViewDelegate, UINavigationBarDelegate, UITableViewDataSource, MPMediaPickerControllerDelegate, AVAudioPlayerDelegate> {
//Define stuff
}

SubClass:

#import <UIKit/UIKit.h>

@interface SubClass : UITableViewCell {
//Define stuff
}

Thanks

[radio_goober]

Originally Posted by jvpython

Sure

Super Class:

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>
#import <MediaPlayer/MediaPlayer.h>
#import "SubClass.h"

@interface SuperClass : UIViewController <UIActionSheetDelegate, UITableViewDelegate, UINavigationBarDelegate, UITableViewDataSource, MPMediaPickerControllerDelegate, AVAudioPlayerDelegate> {
//Define stuff
}

SubClass:

#import <UIKit/UIKit.h>

@interface SubClass : UITableViewCell {
//Define stuff
}

Thanks

UITableViewCell does not inherit from UIViewController. If you are calling [super whatever] in your UITableViewCell, and trying to access a method of UIViewController, you will throw an error, because those classes are not related.

If you've subclassed UITableViewCell, then it's parent is UITableViewCell. Then it's parent is UIView, then UIResponder, and finally NSObject.

Doctor's orders:
1. Why don't you just tell us specifically what you are trying to do in your UITableViewCell?
2. Google and read up on subclasses and superclasses.
3. Google and read up on class inheritance.
4. Google and read up on object oriented programming. There's actually an active thread in this forum that would explain how to do what you are trying to accomplish. The problem is you don't know enough about programming to know what it is you're actually trying to accomplish.

[jvpython]

I only want to do this because in my first class I have a lot of variables which some of my methods use and since I cant access them from the uitableviewcell...

[JasonR]

You should be working the other way around. Your UIViewController class should do the work, and call your table cell class, and not the other way around. That's why Apple made it easy for UIViewController to find a table cell, and difficult to do what you are trying to do.

Give us more details on what you are trying to do if you can't figure out how to reverse your logic.

[jvpython]

Yes thanks that helped me a lot. Ive got my methods working now