I have a subclass of NSOutlineView that has custom delegate methods. In the
implementation file I get an error for "No known instance method for
selector..." when I call these declared methods using [self delegate] or
delegate. However the compiler suggested using _delegate and that makes the
error go away. I thought since my subclass inherits from NSOutlineView that
delegate would be recognized and available.
--------------------------------------------------------------------
HEADER
--------------------------------------------------------------------
#import <Cocoa/Cocoa.h>
@class TKOutlineView; // lets compiler know the @interface deleration is coming
since we put @protocol before it
// delegate protocol
@protocol TKOutlineViewDelegate <NSObject> // <NSObject> because we need to use
"respondsToSelector"
@optional
-(void)outlineView:(NSOutlineView *)theOutlineView
enterKeyPressedForRow:(NSInteger)theRow;
-(void)outlineView:(NSOutlineView *)theOutlineView
deleteKeyPressedForRow:(NSInteger)theRow;
@end
@interface TKOutlineView : NSOutlineView {}
@end
--------------------------------------------------------------------
IMPLEMENTATION
--------------------------------------------------------------------
#import "TKOutlineView.h"
@implementation TKOutlineView
-(void)keyDown:(NSEvent *)theEvent
{
if ([[theEvent characters] length] == 0)
{
// dead key
return;
}
else if ([[theEvent characters] length] == 1 && [[theEvent characters]
characterAtIndex:0] == NSEnterCharacter && [[self delegate]
respondsToSelector:@selector(outlineView: enterKeyPressedForRow:)])
{
[delegate outlineView:self enterKeyPressedForRow:[self
selectedRow]];
}
else if ([[theEvent characters] length] == 1 && [[theEvent characters]
characterAtIndex:0] == NSDeleteCharacter && [[self delegate]
respondsToSelector:@selector(outlineView: deleteKeyPressedForRow:)])
{
[delegate outlineView:self deleteKeyPressedForRow:[self
selectedRow]];
}
else
{
[super keyDown:theEvent];
}
}
@end
Is _delegate the correct usage here or have I done something else wrong? Thank
you.
CT
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