CODEWITHSUNDEEP
ios5delegates
goe
goe

Reputation: 2303

How to use delegates in ios 5

I need to use a delegate object in an iOS application. I have declared the delegate as this:

In the class where the function is defined:

@interface OOObjectCommandInterface : NSObject<OOCameraControllerDelegate>

In the class where the function must be invoqued: (In de .h file)

@protocol OOCameraControllerDelegate

- (void)drawFrame:(CVImageBufferRef) imageBuffer:(BOOL)flip;

@end

and

@interface OOCameraController : UIViewController
{
    ...    
    id<OOCameraControllerDelegate> delegate;
}

@property (nonatomic, readwrite) id<OOCameraControllerDelegate> delegate;

Aditionally, where the second class is initialized:

_hardwareController.delegate = [OOObjectCommandInterface ocInterface];

where _hardwareController is an instance of OOCameraController class. So, when I try to invoque the delegate object, I do this:

[delegate drawFrame:imageBuffer:flip];

but the function is not executed. Any idea?

P.D.: The function I am calling is a singleton class. Could be any problem there?

Upvotes: 3

Views: 523

Answers (2)

vgonisanz
vgonisanz

Reputation: 11930

By definition, a singleton is a design patron to access an object, unique, that only can be created 1 time (first get_instance you do). With get_instance, you can access from everywhere, to the functions inside the singleton, so, Why you are not using it directly?

Write something like [[MySingletonClass get_instance] FunctionThatIWantToUse:...]; And don't use a delegate

Upvotes: 3

iphonedev23
iphonedev23

Reputation: 991

Have you set delegate to self in the second class? Create an object in the second class like

@property (nonatomic, readwrite) id<OOCameraControllerDelegate> delegate;

and then [_hardwareController setDelegate:self];

Upvotes: 4

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