I am having problems with implementing delegates, and I'm sure I'm
doing something silly. Would appreciate help from the experts.....
I can get a simple case to work, where I invoke a delegate method
with no parameters passed, but I can't get the case where I invoke
the delegate method and want to pass an additional object (or flag).
I've written small program to illustrate my problem. I have two
classes, say Foo and Bar. The code allows a user to push a button
on a screen, which starts a process in Foo (a controller type
class). Foo starts a progress bar item on the screen, and calls a
method in class Bar (model class). The method in Bar fires up a
timer (NSTimer) and returns immediately. When the timer expires, I
want to communicate to class Foo that the event was completed.
I am using a design pattern that was available online, and for the
most part everything seems to be working. In the code below, I
fail the condition where I check to see if "_delegate" responds to
the selector (test:didFinish:).
- (void) doneWithTimer: (NSTimer *) aTimer
{
NSLog(@"Bar: time over....");
if ([_delegate respondsToSelector:@selector(test:didFinish:) ])
{
[_delegate test: self didFinish: true];
}
else
{
[NSException raise:NSInternalInconsistencyException
format:@"Foo doesn't respond to
selector"];
}
}
If I have a simple method with no additional parameters, the code
works fine. So, the following works....
- (void) doneWithTimer: (NSTimer *) aTimer
{
NSLog(@"Bar: time over....");
if ([_delegate respondsToSelector:@selector(test:) ])
{
[_delegate test: self];
}
else
{
[NSException raise:NSInternalInconsistencyException
format:@"Foo doesn't respond to
selector"];
}
}
In Foo, I have set up the following delegate method
-(void) test: (dgtest *) sender:didFinish: (BOOL) complete
{
NSLog(@"time over....%d");
[progress stopAnimation:nil];
}
(and of course if I drop ":didFinish: (BOOL) complete", and run the
program passing no parameters then delegates seem to work).
would appreciate any help.
regards,
Albert
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