"Assignment of read-only variable" in completion handler

[benoitr007]

Hello,

I am not familiar with completion handlers, but I'm adding Game Center functionality to my game and need the following code:

BOOL submit_ok = FALSE;
GKScore *scoreReporter = [[[GKScore alloc] initWithCategory:category] autorelease];
scoreReporter.value = score;
[scoreReporter reportScoreWithCompletionHandler:^(NSError *error) {
	if (error == nil) {
		submit_ok = TRUE;
	}
}];

However, I get the following error:

Assignment of read-only variable "submit_ok"

How am I supposed to access that variable inside the completion handler? Thank you very much!

Benoit

[benoitr007]

Any help on this would be very appreciated... I tried to find an answer online but really don't know where to look. Thanks in advance!

[Kalimba]

I haven't personally used blocks since they became available, but after taking a cursory glance at the documentation on Apple's site (Blocks Programming Topics), I think the key bit you might be missing is the __block specifier for your BOOL variable:

__block BOOL submit_ok = FALSE;
GKScore *scoreReporter = [[[GKScore alloc] initWithCategory:category] autorelease];
scoreReporter.value = score;
[scoreReporter reportScoreWithCompletionHandler:^(NSError *error) {
	if (error == nil) {
		submit_ok = TRUE;
	}
}];

[benoitr007]

Thanks, I don't get any errors that way, but unfortunately, I am unable to access the variable outside the block now. I think what I am trying to do (and the way I'm trying to do it) is not really possible, I'll try another solution. Thank you very much!