On Jul 25, 2009, at 3:41 PM, Adam R. Maxwell wrote:
On Jul 25, 2009, at 3:23 PM, Kyle Sluder wrote:
Internally, UITextField is going to use self.delegate to get its
delegate, following the correct accessor behavior. You've gone and
replaced -delegate to return self. But the delegate pattern says
that
messages which this object does not understand should be forwarded to
the delegate. This means that a class with a delegate needs to
implement -respondsToSelector: this way:
- (BOOL)respondsToSelector:(SEL)aSelector {
return [super respondsToSelector:aSelector]
|| [self.delegate respondsToSelector:aSelector];
}
Where is this guaranteed by the delegate pattern? I've created a
fair number of classes with delegates and never done this; it would
be interesting to know that I've been doing it wrong for years ;).
It's not guaranteed - it's just the right way to implement an optional
delegate method.
Luke
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