Ok,
Few quick answers, yes it's being synthesized and no, I haven't
specified my own setters/getters, i'm just letting Cocoa do that part
itself.
When I step through the process in debugger it just confuses me more.
I've put a breakpoint on the "self.delegate = tDelegate" assignment
and stepped through each part of the process (until the error occurs).
Note: the getters/setters discussed here have been created by the
synthesize process
This is what I get:
1. self.delegate = tDelegate // tDelegate is set to
the delegate
2. [self setDelegate:tDelegate] // self.delegate is set to tDelegate
(which is correct)
3. NSLog(@"%@", self.delegate) // self.delegate is set to
NSAutoreleasePool
4. [self delegate] // self.delegate is set to the delegate, but
returns an NSAutoreleasePool
So it seems the getter generated by the synthesize process is doing
something strange, cause if I check in the debugger self.delegate is
set to the right variable, the method simply returns something strange.
I've also tried specifying my own getter & setter, but I get the same
results - it's only when I just assign the variable directly that I
have access to the delegate at all times.
On 07/03/2009, at 10:18 PM, Roland King wrote:
On Mar 7, 2009, at 2:18 PM, Aaron Wallis wrote:
The property was assigned as:
@property (retain) id delegate;
when I walk through the code (and log pretty much everything out)
I get the following:
- (void)processString:(NSString *)tString withDelegate:
(id)tDelegate {
NSLog(@"1. %@", tDelegate); // I get <TMPSTProcessDropOperation:
0x175930>
self.delegate = tDelegate;
NSLog(@"2. %@", self.delegate); // I get <NSAutoreleasePool:
0x187e10>
[self.delegate doSomething]; // I get -[NSAutoreleasePool
doSomething]: unrecognized selector sent to instance 0x187e10
}
and you are @synthesize-ing this property? There are no warnings in
your code about redeclaring variables or not synthesizing methods?
You're not inheriting from something else which declares a delegate?
Have you written a -(void)setDelegate:(id)delegate method, because
if you have that's what self.delegate is calling, that line of code
is identical to [ self setDelegate:tDelegate ]. If you have for some
reason written that method, even if you synthesize the property,
synthesize will not overwrite it.
What's bizarre here is that what is ending up in self.delegate is an
object with an entirely different address. I could believe that you
have an overreleased object and the memory was being reused and it
*looked* like an autorelease pool, but it's just not the same
pointer at all. You are telling it above, set self.delegate to the
object at 0x175930 and yet what ends up in delegate is the object at
0x187e10.
That's why I ask if you have a -(void)setDelegate: method which is
broken and not actually setting the delegate to the argument you
passed in.
What happens if you single step INTO that self.delegate = tDelegate
method? If it's synthesize I think the debugger just moves to the
@synthesize line for one or two steps, you don't actually see any
code, if you have another setDelegate: method you're calling, it
should go there and you'll see what's going on. Also, what is
self.delegate set to before set it to tDelegate?
Note that all the other comments about setting a delegate once and
not retaining it are very valid and true. Its not a hard and fast
rule the delegates are unretained, but in many cases if delegate
means what it usually means, you end up with a retain cycle if you
retain them.
Your solution, setting the delegate member variable directly, sort
of breaks your own encapsulation. That's exactly what self.delegate
= tDelegate should do. Focus on that line of code and figure out
what it doesn't do it.
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