Question

A quick question if I may, can anyone explain what I am missing below, I was assuming the 3rd one with the would work?

@interface ...
// These work
@property(assign) SomeClass *someDelegate;

@property(assign) id someDelegate;

// This gives warning
@property(assign) id  <SomeClassDelegate> someDelegate;

.

@implementation ...
@synthesize someDelegate;

[self setSomeDelegate:[[SomeClass alloc] init]];
[someDelegate setDelegate:self];

.

warning: method '-setDelegate:' not found (return type defaults to 'id')

EDIT_001:

// SomeClass.h

#import <Foundation/Foundation.h>

@class SomeClass;

@protocol SomeClassDelegate <NSObject>
@optional
-(void)didHappen:(SomeClass *)someClass;
@required
-(void)willUse:(SomeClass *)someClass withThis:(BOOL)flag;
@end

@interface SomeClass : NSObject {
    id <SomeClassDelegate> delegate;
}
@property(assign) id <SomeClassDelegate> delegate;
-(void)otherActions;
@end

cheers Gary.

Answer 1

Go protocols!

@protocol MyDelegateProtocol
- (NSNumber*) someFunction:(NSArray*) anArray;
@end

@interface MyClass : NSObject {
  id<MyDelegateProtocol> delegate;
}

@property id<MyDelegateProtocol> delegate

@end

Then in your @implementation:

@synthesize delegate;

As far as I know, the Cocoa way 🙂

Cheers

Nik