Re: Custom Delegate - Using _delegate works but not delegate or [self delegate]
Re: Custom Delegate - Using _delegate works but not delegate or [self delegate]
- Subject: Re: Custom Delegate - Using _delegate works but not delegate or [self delegate]
- From: Quincey Morris <email@hidden>
- Date: Tue, 26 Mar 2013 12:38:50 -0700
On Mar 26, 2013, at 10:30 , Chris Tracewell <email@hidden> wrote:
> How can I get [self delegate] to recognize my custom methods?
There are two ways, one simpleminded, the other a bit sophisticated:
1. Use a local variable:
id<TKOutlineViewDelegate> delegate = [self delegate];
…
[delegate outlineView:self enterKeyPressedForRow:[self selectedRow]];
…
You'd need to introduce the local variable into each scope where you send the delegate one of your custom messages.
2. Redeclare the "delegate" property:
@interface TKOutlineView : NSOutlineView {}
@property (nonatomic,readonly) id<TKOutlineViewDelegate> delegate;
@end
@implementation TKOutlineView
@dynamic delegate;
…
[[self delegate] outlineView:self enterKeyPressedForRow:[self selectedRow]];
…
The @dynamic statement says "I don't have an implementation of the 'delegate' property in this class, but that's just fine because it's already implemented (in my superclass)".
Alternatively, you can avoid @dynamic by supplying an overriding implementation:
- (id<TKOutlineViewDelegate>) delegate {
return [super delegate];
}
but the @dynamic version is a bit more elegant.
With either alternative, this approach lets you avoid the clutter of the additional local variables.
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