对委托模式感到困惑

Question

I'm creating a custom UIView subclass ( shareView ) from a Nib. I created a custom protocol for shareView like this:

@protocol sharePopupDelegate
@required

-(void)userPublishedContent;
-(void)userAbortedPublish;

@end

@interface shareView : UIView
{
     id<sharePopupDelegate> delegate;
}    

In my main.storyboard I created a custom UIViewController myViewController with a shareView view instance called " popup " inside.

So now I got

@property (weak, nonatomic) IBOutlet shareView *popup;

I would like now to delegate myViewController from shareView methods i declared, so I did

self.popup.delegate = self;

inside myViewController but the protocols' methods are not being called inside myViewController.

So i correctly see the shareView instance but cannot interface to its delegate.

Can you help me please?

Thanks in advance

Answer 1

Make sure that you have the protocol declared in myViewController.

For example

   @interface MyViewController : UIViewCOntroller <sharePopupDelegate>

Answer 2

In this section of the code:

@interface shareView : UIView
{
     id<sharePopupDelegate> delegate;
}   

You are creating a strong reference to the delegate, which is not what you want most of the time. Change it to this:

@interface shareView : UIView
@property(weak, nonatomic) id<sharePopupDelegate> delegate;

The shareView class itself must have some way to know when a user publishes content. Maybe you have an action linked up to the shareView which calls a method in the shareView class. For examaple:

- (void)publishButtonTapped {
// some code
}

What you want to do is let the delegate know in that method, something like this:

- (void)publishButtonTapped {

// some code
[self.delegate userPublishedContent];
}

Then whatever action the user takes to cancel:

- (void)cancelButtonTapped {

// some code
[self.delegate userAbortedPublish];
}

Hope this helps.