CODEWITHSUNDEEP
objective-ciosdelegates
frankie
frankie

Reputation: 673

Delegates between class and viewController.m

I have the PGMidi.h with the following delegate

@protocol PGMidiSourceDelegate
- (void) midiSource:(PGMidiSource*)input midiReceived:(const MIDIPacketList *)packetList;

Then in my viewController.m I simply want to get an NSLog when the delegate is called so 

@interface viewController () <PGMidiDelegate, PGMidiSourceDelegate>

@end

@implementation viewController;

- (void) midiSource:(PGMidiSource*)midi midiReceived:(const MIDIPacketList *)packetList   
{
  NSLog(@"test");
}

I know that the delegate is working because in the PGMidi Class I also put

- (void) midiSource:(PGMidiSource*)midi midiReceived:(const MIDIPacketList *)packetList  
{
 NSLog(@"test");
}

and it works.

But for some reason it is not communicating with the viewController.m. I am also declaring the @PGMidi class in the header. But perhaps I have to import the entire PGMidi.h?

Upvotes: 0

Views: 207

Answers (2)

pasawaya
pasawaya

Reputation: 11595

Do you include @end to conclude your code @protocol PGMidiSourceDelegate in PGMidi.h? Also make sure in viewController.h that you say @interface viewController : (parentClass) <PGMidiSourceDelegate. (parentClass) is whatever class viewController inherits from. Basically, either your problem is you forgot the @end or you didn't specify that viewController is a delegate of PGMidi.h.

Upvotes: 0

Michael Frederick
Michael Frederick

Reputation: 16714

In your PGMidi.h you should actually declare a delegate property, i.e.

@property (nonatomic, assign) id<PGMidiSourceDelegate> delegate;

Make sure to synthesize that property in your PGMidi.m file. Then, in your PGMidi.m you should be doing this:

-(void) midiSource:(PGMidiSource*)midi midiReceived:(const MIDIPacketList *)packetList {
    [delegate midiSource:midi midiReceived:packetList];
}

You also need to actually set the view controller as the delegate of your PGMidi object:

myPGMidi.delegate = myViewController;

Upvotes: 1

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